Publications
| Title | Abstract | Year(sorted descending) Filter | PMID Filter |
|---|
| effects of subsoiling and nematicides on hoplolaimus columbus populations and cotton yield. | subsoiling to a depth of 35 cm under the planting row for 3 consecutive years increased annual yields of seed cotton by 50 to 200%. annual subsoiling was essential for maximum yields. the application of a nematicide, 1,2-dibromo-3-chloropropane (dbcp) or aldicarb, reduced the population of hoplolaimus columbus but did not increase seed-cotton yields over subsoiling alone. subsoiling reduced h. columbus in the top 20 cm of soil since the treatment favored deeper penetration by much of the root sy ... | 1977 | 19305573 |
| terpenoid aldehydes in cotton roots susceptible and resistant to the root-knot nematode, meloidogyne incognita. | we investigated the role of terpenoid aldehydes in the resistance of cotton (gossypium hirsutum) to the root-knot nematode (meloidogyne incognita). three-day-old, root-knot-resistant ('auburn 623') and -susceptible ('deltapine 16') seedlings were inoculated with m. incognita. comparable portions of inoculated and noninoculated roots were harvested 2, 4, 7, and 10 days later. terpenoid aldehydes were extracted, separated by thin-layer chromatography, eluted as their phloroglucinol derivatives, an ... | 1977 | 19305600 |
| changes in biochemical composition of the cell wall of the cotton fiber during development. | the composition of the cell wall of the cotton fiber (gossypium hirsutum l. acala sj-1) has been studied from the early stages of elongation (5 days postanthesis) through the period of secondary wall formation, using cell walls derived both from fibers developing on the plant and from fibers obtained from excised, cultured ovules. the cell wall of the elongating cotton fiber was shown to be a dynamic structure. expressed as a weight per cent of the total cell wall, cellulose, neutral sugars (rha ... | 1977 | 16660000 |
| stomatal and nonstomatal regulation of water use in cotton, corn, and sorghum. | stomata of corn (zea mays l.) and sorghum (sorghum bicolor l.) responded to changes in leaf water potential during the vegetative growth phase. during reproductive growth, leaf resistances were minimal and stomata were no longer sensitive to bulk leaf water status even when leaf water potentials approached -27 bars. stomata of corn, cotton (gossypium hirsutum l.), and sorghum appear to respond to changes in the humidity deficit between the leaf and air and in this manner, regulated transpiration ... | 1977 | 16660199 |
| amino acid interactions in the regulation of nitrate reductase induction in cotton root tips. | glycine, asparagine, and glutamine inhibited the induction by nitrate of nitrate reductase activity in root tips of cotton (gossypium hirsutum l.). this inhibition was partially or entirely prevented when the inhibitor was applied in combination with any of several other amino acids. studies of (14)c-labeled amino acid uptake showed that, in most cases, the apparent antagonism resulted simply from competition for uptake. however, certain antagonists did not curtail uptake. the most effective of ... | 1977 | 16660116 |
| effects of some organic solvents on ethylene evolution from young cotton bolls. | the presence of promoter(s) of ethylene biosynthesis in young cotton (gossypium hirsutum l.) fruits (bolls) was demonstrated by injection of an aqueous extract from bolls into other bolls and measurement of a 3-fold increase in rate of ethylene evolution. injection of methionine did not affect rate of ethylene production, indicating that the promoter extracted from bolls was not methionine. injection of the ethoxy analog of rhizobitoxine inhibited ethylene production, indicating that methionine ... | 1977 | 16660111 |
| buoyant density determination- on chloroplast dna in a variegated cytoplasmic mutant of gossypium hirsutum l. | 1977 | 901444 | |
| interaction of boron with components of nucleic acid metabolism in cotton ovules cultured in vitro. | cotton (gossypium hirsutum l.) ovules grown in a defined nutrient medium undergo normal morphogenesis, including fiber production. in identical medium lacking boron, ovules callus and accumulate brown substances. boron deficiency-like symptoms were induced by 6-azauracil and 6-azauridine in ovules growing in boron-sufficient media. other nucleoside base analogs either reduced or had no effect on over-all growth, but did not cause typical boron-deficient callus growth of cotton ovules. orotic aci ... | 1977 | 16659987 |
| udp-glucose: glucan synthetase in developing cotton fibers: i. kinetic and physiological properties. | a uridine diphosphate(udp)-glucose:glucan synthetase can be demonstrated in detached cotton fibers (gossypium hirsutum l.) and in an isolated particulate fraction from such fibers. when assayed with detached fibers, the kinetics of the glucan synthetase activity with respect to variation in substrate concentration is complex and indicates activation of the enzyme by the substrate. activity is stimulated by ca(2+) or mg(2+) and beta-linked glucosides; the effect of the beta-linked glucosides is t ... | 1977 | 16659924 |
| developmental biochemistry of cottonseed embryogenesis and germination: viii. free amino acid pool composition during cotyledon development. | the composition of the free amino acid pool in embryonic cotton (gossypium hirsutum) cotyledons is quite distinct from that of endosperm, and that of germinated, greened cotyledons is quite distinct from that of leaves. during germination (including the precocious germination of immature seeds), the pool expands considerably showing a pronounced accumulation of asparagine. the high level of asparagine found in seedling roots and in the cotyledon vascular exudate indicates that this is the major ... | 1977 | 16659831 |
| an ultrastructural study of early endosperm development and synergid changes in unfertilized cotton ovules. | excised, unfertilized cotton (gossypium hirsutum l.) ovules were cultured for 1-5 days postanthesis and embryo-sac development was studied with the electron microscope. in some ovules the two polar nuclei fuse and the diploid endosperm nucleus goes through a limited number of free nuclear divisions after 2-3 days in culture. each nucleus has two nucleoli, in contrast to nuclei of fertilized triploid endosperm which have three nucleoli. precocious cell walls form between the endosperm nuclei on t ... | 1977 | 24425222 |
| in-ovulo embryo culture and seedling development of cotton (gossypium hirsutum l.). | a convenient and reliable method for culturing cotton embryos is needed to obtain interspecific hybrids of this genus. c.a. beasley and i.p. ting (amer. j. bot. 60, 130, 1973) developed a phytohormone-supplemented medium (btp) upon which the growth of ovules was similar that of in situ ovules. this medium was examined for in-ovulo embryo culture. although good ovule growth occurred on btp no embryos developed to maturity. however, when the medium was supplemented with nh 4 (+) , more than 50% of ... | 1977 | 24420627 |
| abscission responses to moisture stress, auxin transport inhibitors, and ethephon. | the three abscission-inducing agents - water stress, ethephon, and auxin transport inhibitors-acted synergistically to promote leaf fall in cotton (gossypium hirsutum l.). however, the synergism was primarily between stress and ethephon. auxin transport inhibitors did not promote the effect of stress alone, only promoted the effect of ethephon in well watered plants and gave a very small promotion with stress and ethephon together. abscission was rapid in stressed plants treated with ethephon an ... | 1977 | 16659923 |
| auxin transport as related to leaf abscission during water stress in cotton. | plant water deficits reduced the basipetal transport of auxin in cotyledonary petiole sections taken from cotton (gossypium hirsutum l.) seedings. a pulse-labeling technique was employed to eliminate complications of uptake or exit of (14)c-indoleacetic acid from the tissue. the transport capacity or the relative amount of radioactivity in a 30-minute pulse which was basipetally translocated was approximately 30% per hour in petioles excised from well watered seedlings (plant water potentials of ... | 1977 | 16659892 |
| patterns of ethylene and carbon dioxide evolution during cotton explant abscission. | the relationship between abscission and the evolution of ethylene and co(2) was examined in explants and explant segments of cotton seedlings (gossypium hirsutum l. cv. acala sj-1) under both static and flow system conditions, and in the presence and absence of mercuric perchlorate. explant excision was immediately followed by increased ethylene evolution (wound ethylene); senescence was also accompanied by increased ethylene evolution (senescence ethylene). one or two ethylene peaks were found ... | 1977 | 16659877 |
| photosynthesis in relation to leaf characteristics of cotton from controlled and field environments. | in situ and light-saturated net photosynthetic rates per unit leaf area were greater in cotton (gossypium hirsutum l.) plants grown in pots in the field than in similar plants from a phytotron growth chamber. light-saturated stomatal resistances did not differ in leaves of similar age and exposure on field and chamber plants; lower photosynthetic rates in chamber leaves were associated with greater mesophyll resistance. differences in net photosynthetic rates were related to differences in leaf ... | 1977 | 16659857 |
| environmental and genetic components of stomatal behavior in two genotypes of upland cotton. | two parental lines of upland cotton (gossypium hirsutum l.) plus their reciprocal f(1), f(2), and backcross populations were field-tested for environmental and genetic components of leaf diffusive resistance. leaf resistance was measured with a diffusion porometer three times each day during 6 days in august. a large, consistent environmental component was present during the morning, afternoon, and evening, but the genetic component appeared mainly during the afternoon. leaf water potential indi ... | 1977 | 16659850 |
| movement and endogenous levels of abscisic acid during water-stress-induced abscission in cotton seedlings. | in an effort to investigate possible involvement of abscisic acid (aba) in foliar abscission processes, its movement and endogenous levels were examined in cotyledons taken from cotton seedlings (gossypium hirsutum l.) subjected to varying degrees of water deficit, a condition which initiates leaf abscission. using a pulse-labeling technique to avoid complications of uptake and exit from the tissue, aba-1-(14)c movement was observed in both basipetal and acropetal directions in cotyledonary peti ... | 1977 | 16660014 |
| a study of heterosis in upland cotton (gossypium hirsutum l.). | heterosis (over mid parent) and "useful" heterosis (over commercial variety h14) estimates were obtained from a line x tester analysis of crosses involving thirteen diverse female parents with two locally adapted varieties h14 (local standard) and j34. marked heterosis was observed for seed cotton yield, boll number and halo length. the values of positive heterosis and "useful" heterosis for seed cotton yield ranged from 28.1 to 87.0% and 20.1 to 45.5%, respectively. the overall study of heteros ... | 1976 | 24414319 |
| inhibition of linolenic acid synthesis and modification of chilling resistance in cotton seedlings. | the temperature at which cotton seeds (gossypium hirsutum l.) germinated influenced the fatty acid composition of the polar lipids of developing root tips. seeds were germinated at 15, 20, 25, and 30 c. as the temperature decreased the linolemic acid content of the polar lipid fraction increased. sandoz 9785[4-chloro-5-(dimethylamino)-2-phenyl-3(2h)-pyridazinone] reduced the low temperature-induced increase in linolenic acid content of the polar lipids and reduced seedling ability to withstand 8 ... | 1976 | 16659462 |
| effects of abscisic acid on in vitro growth of cotton fiber. | abscisic acid (aba) inhibits in vitro growth of cotton (gossypium hirsutum l.) fiber and is effective only when applied during the first four days of culture started on the day of anthesis. abscisic acid causes a small increase in potassium uptake by the ovules and also enhances leakage of potassium from them. during their period of rapid growth, fibers produced by aba-treated ovules have a higher potassium content and a lower malate content as compared to fibers on untreated control ovules. res ... | 1976 | 24424599 |
| control of enzyme activities in cotton cotyledons during maturation and germination: i. nitrate reductase and isocitrate lyase. | actinomycin d at 10 mug/ml strongly inhibited the increase in isocitrate lyase activity during germination of seeds and 40-day-old embryos of cotton (gossypium hirsutum l.) when the germination period was preceded by 3 hours of soaking in the inhibitor solution. no inhibition was observed without the presoaking. induction of nitrate reductase activity by nitrate was never inhibited by actinomycin d under the same conditions, and was frequently stimulated about 50%. thus, the method of applying a ... | 1976 | 16659595 |
| inhibition of cottonseed germination with abscisic acid and its reversal. | germination of cottonseed (gossypium hirsutum l.) was inhibited by abscisic acid. inhibition was greater when seeds were soaked in abscisic acid for 5 hours and dried prior to germination than when abscisic acid was applied in the germination medium. (2-chloroethyl)phosphonic acid, gibberellic acid, and kinetin partially overcame the inhibitory action of abscisic acid. combinations of (2-chloroethyl)phosphonic acid with gibberellic acid or kinetin were more effective than the individual substanc ... | 1976 | 16659502 |
| water deficit and ethylene evolution by young cotton bolls. | ethylene evolution and abscission of young cotton (gossypium hirsutum l.) bolls were shown, in earlier papers, to increase when plants were subjected to conditions that decreased photosynthesis and sugar content of bolls (dim light, long warm nights). moisture stress also increased ethylene evolution by young bolls, but it did not decrease their concentrations of fructose, glucose, or sucrose. when detached bolls were incubated for 16 or 24 hours at high or low humidity, their rate of ethylene e ... | 1976 | 16659491 |
| interactions of concomitant species of nematodes and fusarium oxysporum f. sp. vasinfectum on cotton. | meloidogyne incognita, hoplolaintus galeatus, and north carolina and georgia populations of belonolaimus longicaudatus were introduced singly and in various combinations with fusarium oxysporum f. sp. vasinfectum on wilt-susceptible 'rowden' cotton. of all the nematodes, the combination of the n. c. population of b. longicaudatus with fusarium promoted greatest wilt development. h. galeatus had no effect on wilt. with fusarium plus m. incognito or b. longicaudatus, high nematode levels promoted ... | 1976 | 19308201 |
| the influence of trichoderma harzianum on the root-knot fusarium wilt complex in cotton. | wilt-susceptible cultivar 'rowden' cotton was inoculated wilh meloidogyne incognita (n), trichoderma harzianum (t), and fusarium oxysporum f. sp. vasinfectum (f) alone and in all combinations in various time sequences. plants inoculated with f alone or in combination with t did not develop wilt, simultaneous inoculation of 7-day-old seedlings with all three organisms (ntf) produced earliest wilt. however, plants receiving nematodes at 7 days and fusarium and trichoderma at 2 or 4 weeks later (n- ... | 1976 | 19308202 |
| in vitro studies of nitrate reductase activity in cotton cotyledons: effects of dowex 1-cl and bsa. | germinating cotton (gossypium hirsutum l. cv. deltapine 16) cotyledons developed two peaks of in vitro nitrate reductase activity; the first was stable in vitro and appeared 24 hours after imbibition; and the second, which was extremely labile in vitro, began to develop after the seedlings had emerged and developed chlorophyll. nitrite reductase activity peaked only after the seedlings had emerged. dowex 1-cl (10%, w/v) and bovine serum albumin (3%, w/v) significantly improved the activity of ex ... | 1976 | 16659629 |
| comparative studies of glyoxysomes from various fatty seedlings. | the separation of various organelles from cotton cotyledon (gossypium hirsutum l.), cucumber cotyledon (cucumis sativus l.), peanut cotyledon (archis hypogaea l.), pine megagametophyte (pinus ponderosa laws), and watermelon cotyledon (citrullus vulgaris schrad.) by sucrose density gradient centrifugation was found to be similar to that described for castor bean endosperm (ricinus communis l.). equilibrium densities were 1.12 to 1.13 g cm(3) for endoplasmic reticulum, 1.17 to 1.19 g/cm(3) for mit ... | 1975 | 16659183 |
| crop rotation and herbicide effects on population densities of plant-parasitic nematodes. | the influence of herbicides and mono- and multicropping sequences on population densities of nematode species common in corn, cotton, peanut, and soybean fields in the southeastern united states was studied for 4 years. each experimental plot was sampled at monthly intervals. the application of herbicides did not significantly affect nematode population densities. meloidogyne incognita and trichodorus christiei increased rapidly on corn and cotton, but were suppressed by peanut and soybean. more ... | 1975 | 19308149 |
| autoradiography of developing syncytia in cotton roots infected with meloidogyne incognita. | cotton (gossypium hirsutum) seedlings, uniformly infected with meloidogyne incognita, were exposed for periods of 1-15 days to a nutrient solution containing tritium-labelled thymidine. syncytium formation began with the amalgamation of cells near the nematode head, and was followed by synchronized mitoses of the nuclei which had been incorporated into a single cell. syncytial nuclei synthesized dna in roots harvested 3, 6, 9, 12, and 15 days after inoculation. seedlings transferred from unlabel ... | 1975 | 19308135 |
| effects of soil texture on the interaction between rhizoctonia solani and meloidogyne incognita on cotton seedlings. | soils containing 60, 75, and 90% coarse particles (sand plus coarse silt) were prepared by dilution of a field soil with 246microm (60-mesh) silica sand. as the coarse-particle content of the soils increased, the synergistic interaction between meloidogyne incognita and rhizoctonia solani on cotton seedlings increased. increasing the coarse-particle content of the soil also increased damage from the nematode alone and slightly increased soreshin damage from r. solani alone. | 1975 | 19308162 |
| effects of soil temperatures and inoculum levels of meloidogyne incognita and rhizoctonia solani on seedling disease of cotton. | soreshin of cotton was more severe from combined infections of rhizoctonia solani and meloidogyne incognita than from either organism alone, when both critical soil temperature and inoculum concentrations were present. optimum soil temperatures for disease development from combined infections were 18 and 21 c. either 2,500 or 5,000 m. incognita larvae per plant, combined with r. solani, increased seedling disease severity over that caused by r. solani alone. when 100 or 500 larvae per plant were ... | 1975 | 19308161 |
| effects of light intensity and quality effects on reproduction of plant-parasitic nematodes. | growing cotton in a greenhouse with 12-h of supplemental light [8,608 lux (800 ft-c) from combination of mercury and lucalux lamps] resulted in 2 x to > 3 x greater reproduction of meloidogyne incognita and belonolaimus longicaudatus as compared to natural light alone. rate of increase of hoplolaimus galeatus was affected little in this experiment. in a second experiment under controlled conditions in a phytotron, light source and intensity had greater influence on the reproduction of heterodera ... | 1975 | 19308183 |
| concentration dependencies of some effects of ethylene on etiolated pea, peanut, bean, and cotton seedlings. | the effects of a series of concentrations of ethylene (10, 20, 40, to 10,240 nl/l) on elongation, diameter, and geotropism of the stems and roots of etiolated seedlings of pisum sativum l., arachis hypogea l., phaseolus vulgaris l., and gossypium hirsutum l. were measured or observed. of the 24 possible responses, 4 were unaffected at the concentrations used, 5 were affected slightly, and the remaining responses exhibited a 14-fold range of apparent half-maximum concentration dependencies (i.e. ... | 1975 | 16659145 |
| abscission: the initial effect of ethylene is in the leaf blade. | the leaf blade of cotton (gossypium hirsutum l. cv. stoneville 213) was investigated as the initial site of ethylene action in abscission. ethylene applied at 14 mul/l to intact 3-week-old plants caused abscission of the third true leaf within 3 days. however, keeping only the leaf blade of this leaf in air during ethylene treatment of the rest of the plant completely prevented its abscission for up to 7 days. this inhibition of abscission was apparently the result of continued auxin production ... | 1975 | 16659075 |
| ethylene-induced leaf abscission is promoted by gibberellic acid. | gibberellic acid (ga(3)) promoted leaf abscission from cotton (gossypium hirsutum l.) plants exposed to ethylene. with mature plants, only the rate of abscission was increased, but when vegetative plants were exposed to ethylene for 4 days or less, the amount of abscission was increased markedly. promotion of abscission occurred at near saturating ethylene levels (10 mul/liter), over a wide range of ga(3) concentrations, and with both ga(3) and ga(7).ga(3) promoted abscission when ethephon was s ... | 1975 | 16659072 |
| differential regulation of nitrate reductase induction in roots and shoots of cotton plants. | the induction of nitrate reductase activity in root tips of cotton (gossypium hirsutum l.) was regulated by several amino acids and by ammonium. glycine, glutamine, and asparagine strongly inhibited induction of activity by nitrate and also decreased growth of sterile-cultured roots on a nitrate medium. methionine, serine, and alanine weakly inhibited induction, and 11 other amino acids had little or no effect. ammonium also decreased induction in root tips, but was most effective only at ph 7 o ... | 1975 | 16659046 |
| simultaneous requirement of carbon dioxide and abscisic acid for stomatal closing in xanthium strumarium l. | open stomata of detached leaves of xanthium strumarium l. closed only when carbon dioxide and abscisic acid (aba) were presented simultaneously. three parameters of stomatal closing were determined after additions of aba to the irrigation water of detached leaves, while the leaves were exposed to various co2 concentrations ([co2]s) in the air; a) the delay between addition of aba and a reduction of stomatal conductance by 5%, b) the velocity of stomatal closing, and c) the new conductance. chang ... | 1975 | 24435438 |
| leaf age as a determinant in stomatal control of water loss from cotton during water stress. | the stomatal resistance of individual leaves of young cotton plants (gossypium hirsutum l. var. stoneville 213) was measured during a period of soil moisture stress under conditions of constant evaporative demand. when plants were subjected to increasing soil water stress, increases in stomatal resistance occurred first on the lower leaves and the stomata on the upper surfaces were the most sensitive to decreasing leaf-water potential. stomatal closure proceeded from the oldest leaves to the you ... | 1975 | 16659351 |
| estimates of genetic parameters for lint quality in upland cotton (gossypium hirsutum). | in a half diallel set of crosses involving twelve ah (67) parents and in a full diallel set with nine albar 51 lines the genetic control of three characters of fibre quality, namely effective length, fibre bundle strength and micronaire value could largely be accounted for by an additive (parent + parent) model. nevertheless, there were non-additive effects that could be attributed to particular parents. however, for practical plant breeding purposes, it seems that where improvements in lint qua ... | 1975 | 24420001 |
| gene effects for fibre properties in upland cotton (gossypium hirsutum l.). | six populations - p1,p2,f1,f2,b1 and b2 - each of five upland cotton (gossypium hirsutum l.) crosses were used to evaluate gene effects in the inheritance of fibre properties by gamble's six-parameter model for the analysis of generation means. partial dominance of long fibres over short fibres and of mature fibres over immature fibres was found in the material studied. overdominance in gene action governed fibre fineness while additive gene action governed the fibre strength. besides additive a ... | 1975 | 24419865 |
| genetic analysis of the duplicate loci, cluster and short branch in gossypium hirsutum l. | six generations, namely p1, p2, f1, f2, b1 and b2, of five different crosses involving diverse parents, h14 (local standard), res h141 (reselection of h141), 419/49 (punjab), 5143c (ceylon) and banda-i (africa) on one hand and prs-72 a cluster type strain on the other, were studied to gain understanding of the genetics of short fruiting branch and cluster boll bearing in upland cotton, gossypium hirsutum l. observations were recorded on cluster vs. noncluster normal plants in the first and secon ... | 1975 | 24420122 |
| osmoregulation in cotton fiber: accumulation of potassium and malate during growth. | kinetics and osmoregulation of cotton (gossypium hirsutum l.) fiber growth (primarily extension) have been studied. growth is dependent on turgor pressure in the fiber. it is inhibited when a decrease in the water potential of the culture medium due to an addition of carbowax 6000, equals the turgor pressure of the fiber. potassium and malate accumulate in the fiber and reach peak levels when the growth rate is highest. maximum concentrations of potassium and malate reached in the fiber can acco ... | 1975 | 16659311 |
| short interval leaf movements of cotton. | gossypium hirsutum l. cv. lankart plants exhibited three different types of independent short interval leaf movements which were superimposed on the circadian movements. the different types were termed sirv (short interval rhythmical vertical), sihm (short interval horizontal movements), and shake (short stroked sirv). the 36-minute period sirv movements occurred at higher moisture levels. the 176-minute period sihm occurred at lower moisture levels and ceased as the stress increased. the shake ... | 1975 | 16659123 |
| identification of plant hormones from cotton ovules. | an extract from 8-day-old cotton ovules (gossypium hirsutum l.) was partitioned into three fractions and each fraction was derivatized and analyzed separately. gas-liquid chromatography and computer-controlled gas-liquid chromatography-mass spectrometry were used to separate, measure, and identify the naturally occurring plant hormones. a single extract contained abscisic acid, indoleacetic acid, and gibberellins a(1), a(3), a(4), a(7), a(9), and a(13) in the first fraction; ethyl indole-3-aceta ... | 1975 | 16659120 |
| carbon dioxide and senescence in cotton plants. | glandless cotton plants (gossypium hirsutum l. cv. coker 100) were subjected to the influence of high co(2)-bicarbonate. the content of protein decreased with no accompanying increase in its degraded products. the decrease in protein was correlated with the low content of chlorophyll and also with the reduced activity of carbonic anhydrase. the initiation of these correlations coincided with the time when the control leaves contained the highest enzyme activity during leaf growth. the high conce ... | 1975 | 16659113 |
| intragenome distribution of 5-methylcytosine in dna of healthy and wilt-infected cotton plants (gossypium hirsutum l.). | fractionation of dna of healthy and wilt-infected cotton plants has been carried out according to the reassociation kinetics and the content of gc and 5-methylcytosine in the resulting fractions has been studied. the genome of cotton plant was found to be methylated quite unevenly. the gc rich (gc equals 64.7 mole%) fraction of highly reiterated sequences (cot equals 0-3.7 times 10- minus 2) has a high content of 5-methylcytosine (5.8 mole%), whereas the methylation degree of the fraction of uni ... | 1975 | 1168849 |
| breeding implications from a diallel analysis in two environments of yield and component characters in upland cotton (gossypium hirsutum). | in a full diallel set of crosses involving nine albar 51 lines the genetic control of yield and yield components were largely accounted for by additive effects, although non-additive effects were evident. significant differences in correlation coefficients between sites and the interaction of genetic effects indicate the effect of the environment on development and gene action. the failure to achieve yield improvements appears to stem from a combination of testing at the early selection stage in ... | 1975 | 24420270 |
| performance of cotton (gossypium hirsutum l.) lines selected for high productivity in three environments. | three groups of cotton (gossypium hirsutum l.) selections that had been screened in separate climatic zones within the san joaquin valley were tested for a 2-year period. selection pressure had been applied solely upon productivity.seven production attributes and eight fiber properties were influenced by the selection pressure on this material. the increase in number of bolls per m(2) virtually account for the genetic gains in yield.environmental influences accounted for the larger part of the v ... | 1975 | 24419510 |
| boron deficiency in unfertilized cotton (gossypium hirsutum) ovules grown in vitro. | boron deficiency and phytohormone interactions have been studied in unfertilized cotton (gossypium hirsutum) ovules grown in vitro. such ovules required exogenous indoleacetic acid and/or gibberellic acid for fiber elongation. boron also was required for maintenance of fiber elongation and normal morphogenesis throughout 14 days of culture. the amount of exogenous boron necessary for maximum fiber elongation varied among experiments, presumably in relation to endogenous boron levels at anthesis. ... | 1974 | 16659003 |
| the effect of calcium nutrition of ethylene-induced abscission. | the influence of calcium nutrition on ethylene-induced abscission was studied by growing cotton (gossypium hirsutum l. cv. stoneville 213) and bean (phaseolus vulgaris l. cv. resistant black valentine) plants for several weeks in nutrient solutions containing 2, 10 (normal level), 15, or 20 meq/l of calcium, and then treating the plants with ethylene. increasing the calcium level of cotton from 2 to 20 meq/l resulted in a 9-fold increase in the calcium content of the abscission zone and a maximu ... | 1974 | 16658973 |
| selecting for productivity within a strain of cotton, gossypium hirsutum l., in three environments. | the effectiveness of selecting cotton (gossypium hirsutum l.) plants solely for productivity was examined in three climatic zones of the san joaquin valley. individual plant selections (f7) were made from the breeding line 12302 (later released as acala sj-1 cultivar) in 1965 at locations in the northern, western, and southern zones of the valley. increased production of seed cotton was shown for selections in each zone when compared with the parental check in replicated trial in 1968.selecting ... | 1974 | 24419280 |
| oscillations in stomatal conductance: the influence of environmental gain. | it is supposed that oscillations in stomatal conductance are associated with the dynamic properties of the loop in which rate of evaporation affects, through physiological processes, the aperture of stomata and stomatal aperture in turn affects rate of evaporation. it is therefore predicted that their occurrence must be influenced by the magnitude of what is termed environmental gain: the sensitivity of rate of evaporation to change in leaf conductance to vapor transfer. two methods of manipulat ... | 1974 | 16658969 |
| location of the low temperature water flow barrier in stems. | experiments are described indicating the magnitude and location of the low temperature barrier to lateral water flow in stems of cotton (gossypium hirsutum l. ;auburn 7-683'). rehydration of wilted stem tissues was performed at 6 c and 32 c. compared with the 32 c control, a 13-fold increase in the rehydration halftime was recorded at 6 c when water entered the secondary phloem tissues across the vascular cambium from the secondary xylem. however, only a 3-fold increase in the rehydration halfti ... | 1974 | 16658945 |
| the manganese toxicity of cotton. | cotton plants (gossypium hirsutum. linn. var. sankar 4) were grown at normal and toxic levels of substrate manganese, and the altered metabolism of manganese toxic plants was studied. the tissues of plants exposed to toxic levels of manganese had higher activities of peroxidase and polyphenol oxidase, and the activities of catalase, ascorbic acid oxidase, glutathione oxidase and cytochrome c oxidase were lowered. in addition, the high manganese tissue had lower contents of atp and glutathione bu ... | 1974 | 16658924 |
| the development of isocitric lyase activity in germinating cotton seed. | in cotyledons of germinating cotton (gossypium hirsutum l. var. stoneville 213) seedlings, in the dark, isocitric lyase (ec 4.1.3.1) activity peaks after 2 days and thereafter slowly declines to a negligible value after 8 days. the maximum activity of this enzyme in cotyledons of 2-day-old seedlings was 16.2 mumoles of glyoxylate formed/15 min.10 cotyledon pairs. actinomycin d at a concentration of 10 mug/ml, if added to the imbibing solution, completely prevents the development of isocitric lya ... | 1974 | 16658859 |
| some ultrastructural and enzymatic effects of water stress in cotton (gossypium hirsutum l.) leaves. | water stress induced by floating discs cut from cotton leaves (gossypium hirsutum l. cultivar stoneville) on a polyethylene glycol solution (water potential, -10 bars) was associated with marked alteration of ultrastructural organization of both chloroplasts and mitochondria. ultrastructural organization of chloroplasts was sometimes almost completely destroyed; peroxisomes seemed not to be affected; and chloroplast ribosomes disappeared. also accompanying water stress was a sharp increase in ac ... | 1974 | 4528731 |
| the effect of trifluralin on the ultrastructure of dividing cells of the root meristem of cotton (gossypium hirsutum l. "acala 4-42'). | 1974 | 4854787 | |
| alternate-1 and alternate-2 disjunctions in heterozygous reciprocal translocations. | alternate-1 and alternate-2 orientation of chromosomes, as well as the two types of adjacent orientation, were observed cytologically in the ring configurations of three reciprocal translocation heterozygotes of gossypium hirsutum l. the observations indicate that the two types of alternate orientation should be characteristic of ring-forming translocations. | 1974 | 17248653 |
| distribution and development of nitrate reductase activity in germinating cotton seedlings. | activity of nitrate reductase in roots and cotyledons of cotton seedings (gossypium hirsutum l. cv. deltapine 16) increased rapidly on germination, reaching a maximum after 1 day of imbibition. thereafter, activity declined until emergence and greening of the cotyledons, when it again began to increase steadily. germinating soybean (glycine max (l.) merrill cv. merit) and sunflower (helianthus annuus l. cv. peredovic) seedlings did not show the early peak of activity. the early peak depended on ... | 1974 | 16658724 |
| post-infection development and histopathology of meloidogyne incognita in resistant cotton. | the numbers of meloidogyne incognita larvae which migrated from cotton roots declined over a 16-day period, but the difference in numbers migrating from resistant and susceptible cultivars was not significant. larvae penetrated susceptible roots, matured, and reproduced within 14 days following inoculation, whereas nematode development in the resistant roots was greatly retarded. three types of histological responses were observed in infected, resistant roots, and these correlated with the degre ... | 1974 | 19319359 |
| resistance of cotton to the root-knot nematode, meloidogyne incognita. | cotton plants resistant to meloidogyne incognita had roots characterized by fewer and smaller galls, and females that produced fewer egg masses containing fewer eggs than did susceptible plants. many galls on resistant roots contained no nematodes at the time of examination. penetration of the resistant cultivar was equal to that of the susceptible cultivar and independent of the number of nematodes in the inoculum. fewer nematodes penetrated resistant or susceptible plants with eight leaves tha ... | 1974 | 19319358 |
| dynamics of concomitant field populations of hoplolaimus columbus and meloidogyne incognita. | from the fall of 1968 through the summer of 1973, a georgia cotton field with a lengthy history of the cotton stunt disease complex was sampled for the presence of plant parasitic nematodes. although meloidogyne incognita was recovered on all sampling dates, concomitant populations of hoplolaimus columbus were not recovered until the spring of 1970. during the succeeding four growing seasons, the population density and horizontal distribution of h. columbus increased, and h. columbus replaced m. ... | 1974 | 19308121 |
| seasonal population dynamics of selected plant-parasitic nematodes on four monocultured crops. | seasonal fluctuations in field populations of meloidogyne incognita, pratylenchus zeae, p. brachyurus, criconemoides ornatus, trichodorus christiei, and helicotylenchus dihystera on monocultured corn, cotton, peanut, and soybean were determined monthly for 4 yr. population densities of m. incognita were greater in corn and cotton plots than in peanut and soybean plots from july until january. those of pratylenchus spp. were greater on corn and soybean than on cotton and peanut during all months ... | 1974 | 19308120 |
| influence of concomitant pratylenchus brachyurus and meloidogyne spp. on root penetration and population dynamics. | populations of pratylenchus brachyurus on cotton were increased significantly in the presence of either meloidogyne incognita or m. arenaria.this occurred with either simultaneous inoculation or prior invasion by m. incognita. p. brachyurus penetrated cotton roots previously invaded by, or simultaneously inoculated with, m. incognita, as well as, or better than, in the absence of m. incognita. prior invasion by m. incognita, however, suppressed p. brachyurus populations on tomato, while it had n ... | 1973 | 19319334 |
| inhibition of rotylenchulus reniformis penetration of tomato and cotton roots with foliar applications of oxamyl. | foliar applications of oxamyl (methyl n', n'-dimethyl-n-[(methylcarbamoyl)oxy]-l-thiooxamimidate) were applied 24 hr before transplanting seedlings to soil infested with rotylenchulus reniformis. with a single application of oxamyl, tomato seedlings required 600 ppm to significantly inhibit r. reniformis penetration. cotton seedlings, however, required a single application of 2400 ppm for significant inhibition of penetration, but only 600 ppm when two or more applications were used. | 1973 | 19319336 |
| proceedings: distribution of histamine-releasing activity in gossypium hirsutum l. | 1973 | 4132097 | |
| the inheritance of gossypol level in gossypium. ii. inheritance of seed gosypol in two trains of cultivated gossypoium barbadense l. | two strains of cultivated gossypium barbadense l., sea island as-2 and pima s-4, were used to study the effects of alleles at two loci on the production and/or storage of gossypol in mature embryos. the normal alleles, gl(2) and gl(3), are "native" to g. barbadense, whereas the mutant alleles, gl(2) and gl(3), were introduced from gossypium hirsutum l. through backcrossing. each strain was grown in three replications per trial, and one, sea island as-2, was grown in three environments. each expe ... | 1973 | 4769299 |
| metabolism of separated leaf cells: iii. effects of calcium and ammonium on product distribution during photosynthesis with cotton cells. | separated mesophyll cells from cotton (gossypium hirsutum var. stoneville 1613 glandless) were isolated with pectinase and mechanical agitation. the separated cells had rates of light-dependent co(2) fixation between 50 to 100 mumoles co(2) per mg chlorophyll per hour. the presence of ca(2+) in the incubation medium did not significantly affect the type of photosynthetic products formed, but 2 mm ca(2+) did cause a 50% decrease in the appearance of photosynthetic products in the incubation mediu ... | 1973 | 16658491 |
| abscission: support for a role of ethylene modification of auxin transport. | three types of whole plant experiments are presented to substantiate the concept that an important function of ethylene in abscission is to reduce the transport of auxin from the leaf to the abscission zone. (a) the inhibitory effect of ethylene on auxin transport, like ethylene-stimulated abscission, persists only as long as the gas is continuously present. cotton (gossypium hirsutum l. cv. stoneville 213) and bean (phaseolus vulgaris l. cv. resistant black valentine) plants placed in 14 mul/l ... | 1973 | 16658489 |
| studies on the 70s ribosomal content of a plastid mutant in gossypium hirsutum. | analysis of a mutation in cotton (gossypium hirsutum), which is maternally inherited, revealed that the completely white sectors of leaves were deficient in the 70s class ribosomes, whereas the yellow sectors exhibited the same level of the latter as in the green leaves. | 1973 | 16658480 |
| rehydration versus growth-induced water uptake in plant tissues. | experiments show that the rate of water uptake by living tissues external to mature xylem of cotton stems (gossypium hirsutum l. auburn 7-683) is very similar to the corresponding curves for leaf tissue. in both cases one obtains a two-phase curve with phase i corresponding to passive rehydration and phase ii pertaining to active growth.a theory of water movement in plant tissue first proposed by philip allows one to make a more rigorous distinction than made previously between phase i and phase ... | 1973 | 16658427 |
| in vivo assay of nitrate reductase in cotton leaf discs: effect of oxygen and ammonium. | factors affecting nitrate reduction by leaf discs of cotton (gossypium hirsutum l.) were investigated. when incubated in 30 mm nitrate, discs reduced nitrate much more slowly under air or o(2) than under n(2). inhibition by o(2) did not occur at nitrate levels of 100 mm or greater. treatment with arsenate had little effect under n(2) but stimulated nitrate reduction under air. similarly, ammonium inhibited nitrate reduction, with the inhibition being partially relieved by arsenate. uptake of nit ... | 1973 | 16658325 |
| ethylene, a regulator of young fruit abscission. | in an earlier study we reported that detached cotton flowers produced sufficient ethylene before the period of natural abscission to suggest that ethylene might be a natural regulator of young fruit abscission. the present report explores this probability further. intact cotton (gossypium hirsutum l.) fruits produced ethylene at rates as high as 36 mul ethylene/kg fresh wt.hr during the 2 days before they abscised. direct measurements of ethylene in gas samples withdrawn from fruits indicated th ... | 1973 | 16658444 |
| leaf age and ethylene-induced abscission. | ethylene has been generally credited with promoting the abscission of the oldest leaves on a plant first. vegetative cotton (gossypium hirsutum l.) seedlings are an exception to this generalization. under some conditions the younger, apical, unexpanded, or partially expanded leaves abscise before the less young, basal leaves or cotyledons. the degree or extent of apical leaf abscission increases with ethylene concentration and with plant age from 2 to 5 weeks. the response is promoted by auxin t ... | 1973 | 16658627 |
| absorption and distribution of high specific radioactivity 2-c-abscisic acid in cotton seedlings. | high specific radioactivity (26.3 mc/mmole) racemic 2-(14)c-abscisic acid was synthesized. an aliquot of abscisic acid, 1.2 x 10(-4)m in aqueous methanolic solution, was applied to the surface of either a cotyledon or the first true leaf of 8- to 32-day-old cotton seedlings (gossypium hirsutum l.). after various intervals (6-192 hours), the seedlings were processed for autoradiography, counting, and identification of the radioactivity. after 6 hours, radioactivity was observed moving basipetally ... | 1973 | 16658580 |
| water stress enhances ethylene-mediated leaf abscission in cotton. | abscission of cotyledonary leaves from cotton (gossypium hirsutum l. cv. stoneville 213) seedlings occurred following relief from water stress. the amount of abscission was related to the magnitude of the plant water deficit. leaf abscission promoted by exogenous ethylene was enhanced in seedlings subjected to water stress. treatment with ethylene (2.0 to 3.2 microliters of ethylene per liter of air for 24 hours) raised the threshold plant water potential required to induce abscission from -17 t ... | 1972 | 16658258 |
| temperature dependence of photosynthesis in cotton. | cotton plants (gossypium hirsutum l., var. deltapine smooth leaf) were grown under controlled environmental conditions over a range of day/night temperatures from 20/15 to 40/35 c. their photosynthetic characteristics were then measured over a comparable temperature range. net photosynthesis tended stongly to be greatest, and intracellular resistance to co(2) transport to be lowest, when the measurement temperature corresponded to the daytime growth temperature, suggesting pronounced acclimation ... | 1972 | 16658208 |
| phloem translocation and heat-induced callose formation in field-grown gossypium hirsutum l. | phloem translocation rates in field-grown cotton (gossypium hirsutum l.) dropped from morning to afternoon and continued to decline toward evening, except that recovery occurred following the hottest afternoon when the maximum temperature was 44 c. water deficits increased from morning to evening, and severity of deficits generally were proportional to daytime heating. water stress contributed toward reducing translocation but was not always the governing factor. callose breakdown appeared to be ... | 1972 | 16658175 |
| the relationship of the peroxidative indoleacetic acid oxidase system to in vivo ethylene synthesis in cotton. | since peroxidase and manganese have been implicated in both auxin destruction and ethylene production, the effect of auxins and high tissue levels of manganese on the peroxidative indoleacetic acid oxidase system and the internal level of ethylene was determined in cotton (gossypium hirsutum l. cv. watson gl-7). the highest level of manganese tested produced manganese toxicity symptoms, including necrotic lesions, accompanied by an increase in internal ethylene levels at about 15 days after trea ... | 1972 | 16658000 |
| the influence of low substrate sodium levels upon the free amino acid content of cotton leaves. | the sodium nutrition of cotton (gossypium hirsutum l.) was investigated. plants were grown in purified nutrient solutions within a chamber designed to minimize sodium contamination. three nutrient solutions were employed that contained in microequivalents/liter: (a) 0.17 na, (b) 43.5 na and (c) 0.75 cs, 14.41 li, and 1.17 rb. all solutions had adequate potassium. total free amino acids were increased by sodium. leaves from plants grown in the high sodium solution contained significantly more fre ... | 1972 | 16657991 |
| malate dehydrogenase isoenzymes from cotton leaves: molecular weights. | malate dehydrogenase isolated from leaves of the cotton plant (gossypium hirsutum l.) appears in the form of several isoenzymes. four of the isoenzymes found in cotton leaf extracts appear to be charge isomers with a molecular weight of approximately 60,000. a fifth malate dehydrogenase isoenzyme found in leaf extracts has a molecular weight of approximately 500,000. under appropriate conditions it is possible to form this high molecular weight isoenzyme from at least one of the smaller isoenzym ... | 1972 | 16657908 |
| abscisic acid: correlations with abscission and with development in the cotton fruit. | abscisic acid was measured in developing cotton fruit (gossypium hirsutum) by means of gas-liquid chromatography. high levels of abscisic acid occurred in correlation with abortion and abscission of young fruit, with low germination of immature seed, and with senescence and dehiscence of mature fruit. declining or low levels of abscisic acid occurred in correlation with the period of most rapid fruit growth and with high germination of immature and mature seed. young fruit of cultivar acala 4-42 ... | 1972 | 16658017 |
| abscission: potentiating action of auxin transport inhibitors. | reduction in petiolar auxin transport has been proposed as one of the functional actions of endogenous or exogenous ethylene as it regulates intact leaf abscission. if this hypothesis is correct, auxin-transport inhibitors should hasten the rate or amount of abscission achieved with a given level of ethylene. evidence presented here indicates that the hypothesis is correct. three auxin transport inhibitors promoted ethylene-induced intact leaf abscission when applied to specific petioles or the ... | 1972 | 16658165 |
| estimation of the transport and carboxylation components of the intracellular limitation to leaf photosynthesis. | a model is presented which enables gas exchange data to be used to partition the intracellular resistance to leaf photosynthesis into carboxylation and transport components. a basic assumption is that the over-all kinetics of the carboxylation reaction fit the michaelis-menten equation.the model was tested for cotton (gossypium hirsutum l., var. deltapine smoothleaf), where photorespiration was suppressed by using gas mixtures containing less than 1.5% oxygen. it was concluded that the transport ... | 1972 | 16658157 |
| high photosynthetic rate of a chlorophyll mutant of cotton. | in a chlorophyll mutant (virescent) and wild-type cotton (gossypium hirsutum l.), a number of photosynthetic parameters have been measured and compared with those published for other chlorophyll mutants. (a) the photosynthetic rates at 230 w/m(2) (400-700 nm) from a tungsten lamp were 36.8 mg co(2) fixed/dm(2).hr (virescent) and 39.5 mg co(2) fixed/dm(2).hr (wild-type). on a chlorphyll basis, the photosynthetic rates were 36.8 and 12.1 mg co(2) fixed/mg chl.hr, respectively. (b) the photosynthet ... | 1972 | 16658093 |
| ethylene: role in fruit abscission and dehiscence processes. | two peaks of ethylene production occur during the development of cotton fruitz (gossypium hirsutum l.). these periods precede the occurrence of young fruit shedding and mature fruit dehiscence, both of which are abscission phenomena and the latter is generally assumed to be part of the total ripening process. detailed study of the dehiscence process revealed that ethylene production of individual, attached cotton fruits goes through a rising, cyclic pattern which reaches a maximum prior to dehis ... | 1972 | 16658259 |
| ethylene: response of fruit dehiscence to co(2) and reduced pressure. | these studies were conducted to determine whether ethylene serves as a natural regulator of fruit wall dehiscence, a major visible feature of ripening in some fruits. we employed treatments to inhibit ethylene action or remove ethylene and observed their effect on fruit dehiscence. co(2) (13%), a competitive inhibitor of ethylene action in many systems, readily delayed dehiscence of detached fruits of cotton (gossypium hirsutum l.), pecan (carya illinoensis [wang.] k. koch), and okra (hibiscus e ... | 1972 | 16658260 |
| auxin transport: a new synthetic inhibitor. | the new synthetic plant growth regulator dpx1840 (3,3a-dihydro-2-(p-methoxyphenyl)-8h-pyrazolo [5,1-a] isoindol-8-one) was examined for its effects on auxin transport. at a concentration of 0.5 mm in the receiver agar cylinders dpx1840 significantly inhibited the basipetal transport of naphthaleneacetic acid-1-(14)c in stem sections of vigna sinensis endl., pisum sativum l., phaseolus vulgaris l., glycine max l., helianthus annuus l., gossypium hirsutum l., and zea mays l. without significantly ... | 1972 | 16658167 |
| role of nematodes and soil-borne fungi in cotton stunt. | the nematodes, pratylenchus brachyurus, trichodorus christiei, and t. porosus and the soil-borne fungi, rhizoctonia solani, pythium debaryanum, p. irregulare, p. ultimum, and fusarium spp. were the pathogens most frequently found in the roots and rhizosphere of field-grown cotton (gossypium hirsutum) showing "stunt" symptoms. field-plot application of the nematicide d-d (l,2-dichloropropane, 1,3-dichloropropene) at 373.4 liter/ha (40 gal/a) significantly increased plant growth and yield. a fungi ... | 1971 | 19322335 |
| interaction of rotylenchulus reniformis, soil salinity, and cotton. | rotylenchulus reni]ormis occurred equally in relatively non-saline (4.0 mmhos/cm) and highly-saline (16.5 mmhos/cm) soils in sampling transects across zones of depressed plant growth in six texas cotton fields.results from greenhouse pot experiments indicated progressive positive interaction of salinity and r. reni[ormis pathogenicity in the range 6-18 mmhos/cm. | 1971 | 19322365 |
| influence of incubation solution on the rate of recovery of pratylenchus brachyurus from cotton roots. | the rate of recovery of pratylenchus brachyurus from cotton roots was enhanced when the tissue was incubated in solutions containing 10 ppm ethoxyethyl mercuric chloride, 50 ppm dihydrostreptomycin sulfate, 50, 100, or 1,000 ppm diisobutylphenoxethyl dimethyl benzyl ammonium chloride, or mixtures of these compounds. incubation in 10 or 100 ppm zinc sulfate, zinc chloride, or magnesium chloride also enhanced the rate of recovery. incubation solutions containing 1 or 1,000 ppm zinc chloride or mag ... | 1971 | 19322395 |
| reaction of field-grown sericea lespedeza to selected meloidogyne spp. | five sericea lespedeza (lespedeza cuneata [dumont] g. don) breeding lines resistant to meloidogyne incognita, m. incognita acrita, and m. hapla as seedlings in greenhouse tests and two varieties were resistant to m. incognita acrita in field experiments. root-knot galling and larvae numbers were less for resistant entries than for the susceptible check when grown in root-knot infested field soil for three growing seasons. forage yields were as much as 57 times greater for resistant entries than ... | 1971 | 19322393 |
| influence of soil water stress on evaporation, root absorption, and internal water status of cotton. | diurnal variations in leaf water potential, diffusion resistance, relative water content, stem diameter, leaf temperature, and energy balance components were measured in cotton (gossypium hirsutum l. var. lankart 57) during drought stress under field conditions. a plot of leaf water potential against either relative water content or stem diameter during the 24-hour period yielded a closed hysteresis loop. the relation between cell hydration and evaporation is discussed.despite low soil water pot ... | 1971 | 16657880 |
| abscission: the role of ethylene modification of auxin transport. | the role of ethylene-mediated reduction of auxin transport in natural and ethylene-induced leaf abscission was studied in the cotton (gossypium hirsutum l., cv. stoneville 213) cotyledonary leaf system. the threshold level of ethylene required to cause abscission of intact leaves was between 0.08 and 1 mul/l with abscission generally occurring 12 to 24 hours following ethylene fumigation. the threshold level of ethylene required to reduce the auxin transport capacity in the cotyle-donary petiole ... | 1971 | 16657764 |
| chilling injury and nucleotide changes in young cotton plants. | the effects of chilling at 3 to 5 c on the nucleotide composition of roots and leaves of cotton (gossypium hirsutum l.) seedlings were determined. chilling decreased the concentration of nucleotides, especially di- and triphosphates, in both leaves and roots. chilling also caused an increase in free nucleosides. the results are interpreted to mean that general phosphorolytic activity is associated with chilling injury rather than damage to the phosphorylating mechanisms alone. hardening at 10 to ... | 1971 | 16657756 |
| identification and quantitative analysis of the volatile substances emitted by maturing cotton in the field. | when atmosphere from cotton plants (gossypium hirsutum l., var. deltapine smoothleaf) was condensed by passing it over the expansion coil of an air conditioner and three 1-hour collections per day (early morning, noon, and late afternoon) were made, the total essential oils were found to consist of 50 to 60% beta-bisabolol (i(k) 1660) and gamma-bisabolene (i(k) 1550) and 30 to 40% geraniol (i(k) 1250), myrtenal (i(k) 1328), nerolidol (i(k) 1520), and beta-caryophyllene oxide (i(k) 1590). as the ... | 1971 | 16657733 |
| stimulation of solute loss from radicles of gossypium hirsutum l. by chilling, anaerobiosis, and low ph. | the loss of organic substances from cotton (gossypium hirsutum l.) radicles is enhanced by chilling, low ph, or anaerobic conditions. solute loss returns to a low level when the stimulus is removed, indicating no permanent injury to membranes. loss of solute induced by chilling or anaerobiosis is reversed or prevented by calcium or magnesium. these cations did not reduce the solute loss resulting from low ph. the site of loss appears to be localized at or near the root tip. if the seedling cotyl ... | 1970 | 16657421 |
| effect of ethylene on the uptake, distribution, and metabolism of indoleacetic acid-1-c and -2-c and naphthaleneacetic acid-1-c. | the effect of ethylene on the uptake, distribution, and metabolism of indoleacetic acid (iaa)-1-(14)c, iaa-2-(14)c, and naphthaleneacetic acid (naa)-1-(14)c in cotton stem sections (gossypium hirsutum l., var. stoneville 213) was studied. stem sections excised from plants pretreated with ethylene for 15 hours transported significantly less (14)c-iaa and (14)c-naa than control sections. concomitant features of the reduction of (14)c-iaa transport were an increase in decarboxylation and a trend to ... | 1970 | 16657409 |
| factors involved in the opening of the hypocotyl hook of cotton and beans. | conditions influencing the opening of the bean (phaseolus vulgaris l.) and cotton (gossypium hirsutum l.) hypocotyl hook were defined. such hooks were shown to undergo geotropic curvature; orientation of the hook with respect to gravity greatly affected the observed opening. cotton and bean hooks behaved exactly opposite in regard to the presence of the cotyledons and apical bud. the cotton hook required the cotyledons for opening, but the corresponding tissue slowed or inhibited opening of the ... | 1970 | 16657340 |