Publications
| Title | Abstract | Year(sorted ascending) Filter | PMID Filter |
|---|
| title: potassium application regulates nitrogen metabolism and osmotic adjustment in cotton (gossypium hirsutum l.) functional leaf under drought stress. | to evaluate the role of potassium (k) in maintaining nitrogen metabolism and osmotic adjustment development of cotton functional leaves to sustain growth under soil drought and rewatering conditions, the plants of two cotton cultivars siza 3 (low-k sensitive) and simian 3 (low-k tolerant), were grown under three different k rates (k0, k1, and k2; 0, 150, and 300kgk2oha(-1), respectively) and exposed to drought stress with 40±5% soil relative water content (srwc). the drought stress was applied a ... | 0 | 28527336 |
| viable deficiency-duplications from a translocation in gossypium hirsutum. | 1952 | 17247415 | |
| the transmission of marker genes in intraspecific backcrosses of gossypium hirsutum l. | 1952 | 17247397 | |
| the genetics of flowering response in cotton. i. fruiting behavior of gossypium hirsutum var. marie-galante in a cross with a variety of cultivated american upland cotton. | 1957 | 17247711 | |
| [on the phenomena of chromosomal segregation observed in the miosis of the synthetic tetraploid (gossypium hirsutum x g. arboreum x g. raimondii) and its descendants]. | 1961 | 13751067 | |
| the genetics of flowering response in cotton. iii. fruiting behavior of gossypium hirsutum race latifolium in a cross with a variety of cultivated american upland cotton. | 1961 | 17248048 | |
| the genetics of flowering response in cotton. iv. quantitative analysis of photoperiodism of texas 86, gossypium hirsutum race latifolium, in a cross with an inbred line of cultivated american upland cotton. | 1962 | 17248135 | |
| enhancing linkage-block breakup following interspecific hybridization and backcross transference of genes in gossypium hirsutum l. | 1962 | 14491799 | |
| the comparative genetics of gossypium hirsutum l. and the synthetic amphiloid, gossypium arboreum l. x gossypium thurberi tod. | 1962 | 13898581 | |
| genetic analysis of six primary monosomes and one tertiary monosome in gossypium hirsutum. | 1963 | 17248191 | |
| antiquity of american polyploid cotton. | fragments of a boll of gossypium hirsutum l. from archeological excavations near tehuacán, mexico, prove that this species existed in 5800 b. c. no doubt remains that american tetraploid cotton species originated through natural hiybridization. | 1964 | 17772618 |
| the ultrastructure of cotyledonary tissue from gossypium hirsutum l. seeds. | quiescent cottonseeds stored in a dry, anaerobic situation for over a year have been shown to contain cells whose contents are ultrastructurally similar to those of normal, fully hydrated plant cells. plastids, mitochondria, and nuclei of the cells of cotyledon tissue in dry seeds possess normal-looking double membranes even under conditions of extreme desiccation. previous reports have indicated on the basis of light microscopic work, that the cells of certain dry seeds do not possess nuclear m ... | 1965 | 19866664 |
| tests for the association of marker loci with chromosomes in gossypium hirsutum by the use of aneuploids. | 1965 | 17248254 | |
| american cotton rat (sigmodon hispidus) as an experimental host for brugia pahangi. | 1965 | 5857267 | |
| the anomalous behavior of the ghost spot of gossypium anomalum in amphidiploid gossypium hirsutum. | 1965 | 17248255 | |
| the genetics of flowering response in cotton. v. fruiting behavior of gossypium hirsutum and gossypium barbadense in interspecific hybrids. | 1965 | 17248253 | |
| effects of ethylene on auxin transport. | the effect of ethylene on the uptake, distribution and polar transport of c(14) from indole-3-acetic acid-2-c(14) and naphthalene acetic acid-1-c(14) in tissue sections was studied. test species were cotton (gossypium hirsutum, l.) and cowpea (vigna sinensis, endl.). generally, incubation of tissue or intact plants with ethylene reduced the degree of polar auxin transport. ethylene inhibited the movement of both auxins in stem tissue and iaa in petiole tissue of cotton. the effect of ethylene on ... | 1966 | 16656230 |
| role of iaa-oxidase in abscission control in cotton. | the potential role of indoleactic acid (iaa)-oxidase as an in vivo abscission regulating system in the cotton (gossypium hirsutum l.) cotyledonary explant was investigated. phenols (usually monophenols), which are cofactors of cotton iaa-oxidase in vitro, accelerated abscission. phenols (usually orthodihydroxyphenols), which inhibit cotton iaa-oxidase in vitro, inhibited abscission. inhibition or stimulation of abscission was accomplished by phenols both with and without iaa. results were simila ... | 1966 | 16656432 |
| effect of ethylene on auxin transport. | ethylene was found to have no influence on auxin transport in hypocotyls of helianthus annuus and phaseolus vulgaris; coleoptiles of zea mays; petiole sections of gossypium hirsutum, phaseolus vulgaris, and coleus blumei. in the experiments described here, the tissues were treated with ethylene only during the 3 hours of polar transport. this short treatment is in contrast to the methods of others who found an effect of ethylene on auxin transport when plants grown in ethylene are used as experi ... | 1966 | 5990936 |
| effect of manganese toxicity on the indoleacetic acid oxidase system of cotton. | the effect of substrate manganese on tissue manganese levels and activity of the indoleacetic acid (iaa)-oxidase system of cotton (gossypium hirsutum, l.) was investigated. a sand culture technique was used with 1, 3, 9, 27 and 81 mg manganese (mnso(4)) per liter nutrient solution applied in various experiments.the following relationships held for both long-term (126 days) and short-term (12-14 days) exposures to manganese treatment: a) there was a direct relationship between substrate and tissu ... | 1966 | 16656311 |
| extraction of nucleic acids from lyophilized plant material. | four methods for extracting nucleic acids from lyophilized cotton (gossypium hirsutum l. cv. stoneville 62) leaves and roots were compared. they were based on the use of: (i) hc10(4); (ii) koh; (iii) a mixture of 90% phenol, tris (hydroxymethyl) aminomethane buffer, and sodium lauryl sulfate; and (iv) nacl. (i) extracted large amounts of rna but little dna and extracted much carbohydrate and protein contaminants. (ii) gave a good yield of both rna and dna but extracted such large amounts of cont ... | 1966 | 16656306 |
| rna composition in cotton. | nucleotide compositions of soluble (srna), whole-cell, and in one instance particulate and nonparticulate, rna of embryos, cotyledons (dark and light-grown), leaves, stems, and roots of gossypium hirsutum were compared. evidence of substantial differences in the overall compositions of the rnas was not obtained. however, a tendency for some plant parts to differ, particularly in srna composition, and that of the cotyledons (including particulate and nonparticulate rna) to change during the forma ... | 1966 | 16656287 |
| light effects on the nucleic acids of excised cotton cotyledons. | the effects of light and glucose in the nutrient medium on the nucleic acid metabolism of excised 8-day cotton (gossypium hirsutum var. acala 44) cotyledons were determined. the rates of synthesis as affected by light and glucose were determined by brief exposures to c(14)-labeled orotic acid. the nucleic acids were fractionated by homogenizing in tris-hcl buffer and centrifuging to obtain soluble and microsomal rna (20,000 x g supernatant) and a particulate nucleic acid fraction (20,000 x g pre ... | 1966 | 5906375 |
| diurnal rhythm of sensitivity of cotton seedlings to herbicides. | the inhibition of growth of cotton seedlings (gossypium hirsutum, var. stardel) varied diurnally to applications of three herbicides [1,1-dimethyl-3-(alpha,alpha,alpha-trifluoro-m-tolyl) urea, 3',4'-dichloro-2-methacrylamide, and ethyl-n,n-dipropylthiocarbamate], but not to a fourth [3-(3,4-dichlorophenyl)-1, 1-dimethylurea]. inhibition was strongest when the plants were treated at about daybreak. the rhythmic response was apparently not endogenously controlled, since most of the diurnal effect ... | 1967 | 6054808 |
| cotton embryogenesis: the entrance and discharge of the pollen tube in the embryo sac. | an analysis of the entrance and discharge of the pollen tube into the embryo sac of gossypium hirsutum was made with the light and electron microscopes. the following sequence of events is seen in cotton: 1. one of the two synergids begins to degenerate following pollination but before the pollen tube reaches the embryo sac. this degeneration is marked by the swelling and darkening of the organelle membranes, the collapse of the vacuoles, and the disappearance of the plasma membrane. striking ch ... | 1967 | 24522707 |
| photosynthesis, transpiration, leaf temperature, and stomatal activity of cotton plants under varying water potentials. | cotton plants, gossypium hirsutum l. were grown in a growth room under incident radiation levels of 65, 35, and 17 langleys per hour to determine the effects of vapor pressure deficits (vpd's) of 2, 9, and 17 mm hg at high soil water potential, and the effects of decreasing soil water potential and reirrigation on transpiration, leaf temperature, stomatal activity, photosynthesis, and respiration at a vpd of 9 mm hg.transpiration was positively correlated with radiation level, air vpd and soil w ... | 1967 | 16656488 |
| cotton embryogenesis: the zygote. | the zygote of cotton (gossypium hirsutum) remains undivided for approximately [formula: see text] days following fertilization. the changes which occur during this period can be divided into two stages. during stage 1 the zygote decreases in volume so that its volume becomes one half that of the egg. correlated with this change a number of alterations occur in the endoplasmic reticulum (er) numerous enlargements form; it becomes closely associated with the plasma membrane; and an internal networ ... | 1968 | 24522906 |
| genetical studies concerning the distribution of trichomes on the leaves of gossypium hirsutum l. | 1968 | 17248422 | |
| characteristics of a virescent cotton mutant. | the virescent cotton (gossypium hirsutum) mutant described here differs from normal cultivated cotton by a single mutation in the nucleus. the mutant exhibits nuclear control of chlorophyll and carotenoid development. young leaves are distinctly yellow and become green with age. there is no unusual photometabolism of (14)co(2) or (14)c-acetate in this mutant. it is probable that the nuclear virescent mutation is in a locus concerned with making structural units. the yellow leaves do show a high ... | 1968 | 16656945 |
| cotton embryogenesis: the pollen cytoplasm. | the ultrastructure and composition of cotton (gossypium hirsutum) pollen, exclusive of the wall, was examined immediately before and after germination. the pollen grain before germination consists of two parts: the outer layer and a central core. the outer layer contains large numbers of mitochondria and dictyosomes as well as endoplasmic reticulum (er). the core contains units made of spherical pockets of er which are lined with lipid droplets and filled with small vesicles; the er is rich in p ... | 1968 | 24519656 |
| cotton embryogenesis: the tissues of the stigma and style and their relation to the pollen tube. | the stigma of cotton (gossypium hirsutum) is covered by unicellular hairs. the cytoplasm of these hairs degenerates before the stigma becomes receptive. the vacuole remains intact, but the hair cytoplasm becomes a mass of dark, amorphous material with only a few organelles still being visible. the rest of the stigma consists of thin-walled parenchyma cells with large vacuoles and large amounts of starch. the cells of the style are differentiated into a uniseriate epidermis, vascular tissue, a co ... | 1968 | 24515374 |
| the inheritance of gossypol level in gossypium i. additive, dominance, epistatic, and maternal effects associated with seed gossypol in two varieties of gossypium hirsutum l. | 1968 | 17248408 | |
| oxidative and phosphorylative activities of mitochondria isolated from cotton hypocotyls. | mitochondria isolated from 2 strains of cotton plant hypocotyls (gossypium hirsutum l. var. rex smooth leaf and rex glandless) were examined for their oxidative phosphorylation activities. bovine serum albumin at a relatively high concentration was essential in the extraction medium for the isolation of oxidatively active mitochondria from both strains of cotton. phosphorylation was obtained only with rex glandless cotton mitochondria. this activity was low in comparison to the mitochondria isol ... | 1968 | 16657001 |
| ethylene modification of an auxin pulse in cotton stem sections. | the effect of ethylene on the basipetal movement of indole-3-acetic acid-1-(14)c through cotton stem sections (gossypium hirsutum, l. var. stoneville 213) was studied apart from processes involved in the uptake and exit of auxin by the section. stem sections 60 mm in length were pretreated with ethylene or placed in room air (control) and pulse labeled for 20 min with iaa-1-(14)c. in both the ethylene treated and control sections, the iaa-1-(14)c taken up moved basipetally as a peak of radioacti ... | 1969 | 16657258 |
| abscission: role of abscisic acid. | the effect of abscisic acid on cotton (gossypium hirsutum l. cv. acala 4-42) and bean (phaseolus vulgaris l. cv. red kidney) explants was 2-fold. it increased ethylene production from the explants, which was found to account for some of its ability to accelerate abscission. absci is acid also increased the activity of cellulase. increased synthesis of cellulase was not du to an increase in aging of the explants but rather was an effect of abscisic acid on the processes that lead to cellulase syn ... | 1969 | 16657181 |
| chilling injury and changes in adenosine triphosphate of cotton seedlings. | young gossypium hirsutum l. seedlings chilled at 5 degrees showed a continual decrease in atp concentration with time of chilling. chilled plants returned to optimum conditions were able to restore the initial atp concentration when chilled only 1 day, but not when chilled 2 days. the decrease in atp with chilling was prevented by hardening the seedlings at 15 degrees for 2 days (14-hr-day-length) immediately before chilling. the atp level of hardened plants was higher than of unhardened plants. ... | 1969 | 16657107 |
| abscission: role of cellulase. | cellulase (beta-1,4-glucan-glucanohydrolase ec 3.2.1.4) activity increased during abscission and was localized in the cell separation layer of phaseolus vulgaris l. cv. red kidney (bean), gossypium hirsutum l. cv. acala 4-42 (cotton) and coleus blumei benth. princeton strain (coleus) abscission zone explants. cellulase activity was optimum at ph 7, was reduced by one-half after heating to 55 degrees for 10 min, and was associated with the soluble components of the cell. explants treated with agi ... | 1969 | 16657082 |
| stimulation of ethylene evolution and abscission in cotton by 2-chloroethanephosphonic acid. | ethrel, a mixture of 2-chloroethanephosphonic acid and its ethyl ester, hastens abscission of leaves, debladed petioles, and flower buds of cotton plants (gossypium hirsutum, l.). both young and old leaves abscissed while still green. application of ethrel stimulated evolution of ethylene, and this response preceded abscission. air concentrations of ethylene around enclosed, treated-plants were adequate to produce abscission in plants. non-treated plants defoliated when enclosed with plants spra ... | 1969 | 16657066 |
| strontium mobility in germinating seeds and plants. | the uptake of strontium in the bean plant (phaseolus vulgaris) was linear for the first 34 hr during continuous exposure to radiostrontium. after 35 hr there was a sharp increase in the rate of uptake to 48 hr. radioactivity could be detected in the plant as early as 1 hr after addition of radiostrontium to the growth medium.seventy-five percent of the radiostrontium was located in the seed coat immediately after soaking bean seed in an (89)sr solution. this radioactivity in the seed coat decrea ... | 1969 | 5775205 |
| 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 |
| growth regulator changes in cotton associated with defoliation caused by verticillium albo-atrum. | cotton plants, variety acala 4-42 family 77 (gossypium hirsutum l.,), were stem puncture-inoculated with either a defoliating isolate (t9) or a nondefoliating isolate (ss4) of verticillium albo-atrum (reinke and berth.). as symptoms developed, growth regulators were assayed in diseased plants to discern their importance in the disease syndrome.an avena coleoptile straight growth bioassay demonstrated the presence of several growth-regulatory compounds in cotton tissue extracts. indoleacetic acid ... | 1970 | 16657316 |
| population dynamics of plant nematodes in cultivated soil: effect of summer cover crops in newly cleared land. | five nematode species were studied for ability to develop on seven summer cover crops in rotation with tomato transplants grown every third year. increase of tylenchorhynchus claytoni, trichodorus christiei, pratylenchus brachyurus, helicotylenchus dihystera, and xiphinema americanum in newly cleared soil varied with different cover crops. no substantial nematode population increases occurred until the third summer of crop growth. all species except x. americanum and h. dihystera developed best ... | 1970 | 19322300 |
| hatching response of meloidogyne incognita acrita to electric shock. | the influence of electric shock on hatch of meloidogyne incognita acrita from egg masses taken from roots of 'acala sj-i' cotton (gossypium hirsutum l.) was studied. egg masses in tap water were individually placed between the tips of needle electrodes 1 mm apart and exposed to potentials of l, 10, 20, and 60 vdc/mm at 1, 1, 1, and 86 milliamperes dc, respectively, for periods of 2 and 60 seconds. hatched larvae were counted at five-day intervals for 60 days. of the eight treatment combinations ... | 1970 | 19322315 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 | |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |