| beneficial effect of post -thawing osmoconditioning on the recovery of cryopreserved coffee (coffea arabica l.) seeds. | osmoconditioning-controlled rehydration of seeds in a solution with low osmotic potential -has been shown to reinvigorate aged seeds. the present work aimed at investigating the effect of osmoconditioning on the germination of cryopreserved seeds of coffea arabica, whose viability and vigour are drastically affected by cryopreservation. for cryopreservation, seeds were desiccated to 0.21 g h2o/g dw, cooled at 1 degree c/min to -50 degree c, then immersed rapidly in liquid nitrogen. after rapid r ... | 2002 | 12148064 |
| on the role of (-)-2-methylisoborneol for the aroma of robusta coffee. | the role of 2-methylisoborneol (mib) in coffee aroma is controversially discussed in the literature. mib is known as an off-flavor compound in drinking water and food, but it has also been suggested as a key flavor component of robusta coffee, discriminating robusta from arabica coffee. to check this hypothesis the role of mib in coffee brews was studied. two reference samples containing pure arabica and robusta coffee brews were compared with five samples of arabica coffee brews containing incr ... | 2002 | 12137492 |
| comparison of somatic embryogenesis-derived coffee (coffea arabica l.) plantlets regenerated in vitro or ex vitro: morphological, mineral and water characteristics. | coffea arabica l. plantlets obtained ex vitro after sowing somatic embryos produced in a bioreactor in horticultural substrate were compared with those obtained in vitro from the same embryo population under conventional culturing conditions on semi-solid media. the intensity and quality of aerial and root system development were compared. shoot emergence was more efficient in vitro but rooting frequencies were low. in contrast, all ex vitro-regenerated embryos rooted. the cotyledon area of matu ... | 2002 | 12125775 |
| the value of bees to the coffee harvest. | the self-pollinating african shrub coffea arabica, a pillar of tropical agriculture, was considered to gain nothing from insect pollinators. but i show here that naturalized, non-native honeybees can augment pollination and boost crop yields by over 50%. these findings, together with world coffee-harvest statistics and results from field studies of organically shade-grown coffee, indicate that coffee plants would benefit from being grown in habitats that are suitable for sustaining valuable poll ... | 2002 | 12066176 |
| effect of roasting on the antioxidant activity of coffee brews. | colombian arabica coffee beans were roasted to give light, medium, and dark samples. their aqueous extracts were analyzed by gel filtration chromatography, uv-visible spectrophotometry, capillary electrophoresis, and the abts(*)(+) assay. a progressive decrease in antioxidant activity (associated mainly with chlorogenic acids in the green beans) with degree of roasting was observed with the simultaneous generation of high (hmm) and low molecular mass (lmm) compounds possessing antioxidant activi ... | 2002 | 12059145 |
| differential gene expression during somatic embryogenesis in coffea arabica l., revealed by rt-pcr differential display. | molecular and biochemical studies of somatic embryogenesis may help to shed light on the mechanisms governing this phenomenon. in this article, a differential display analysis approach was employed to investigate the changes taking place during the induction of somatic embryogenesis in leaf explants and suspension cultures of coffee. cloned fragments show homologies to several proteins reported in databases, but only one has previously been described as regulated during somatic embryogenesis. by ... | 2002 | 11989658 |
| chemical characterization of galactomannans and arabinogalactans from two arabica coffee infusions as affected by the degree of roast. | galactomannans and arabinogalactans compose almost exclusively the polysaccharide fraction of roasted coffee infusions. to increase the knowledge about the effect of the degree of roast (dr) in the amount and chemical structure of the galactomannans and arabinogalactans, two arabica coffees of different geographical origins (costa rica and brazil) were roasted for three degrees of roast (drs 4.7-5.0, 8.7, and 10% of dry weight loss of green coffee beans, on a dry basis). the high molecular weigh ... | 2002 | 11879015 |
| effect of roasting on degradation and structural features of polysaccharides in arabica coffee beans. | the degree and nature of polysaccharide degradation at different roasting levels was determined for three arabica (coffea arabica) bean varieties. between 12 and 40% of the bean polysaccharides were degraded depending on the roasting conditions. the thermal stability of the arabinogalactans, (galacto)mannans and cellulose was markedly different. the arabinogalactans and mannans were degraded up to 60 and 36%, respectively, after a dark roast, while cellulose showed negligible evidence of degrada ... | 2002 | 11861016 |
| alkylpyridiniums. 2. isolation and quantification in roasted and ground coffees. | recent model studies on trigonelline decomposition have identified nonvolatile alkylpyridiniums as major reaction products under certain physicochemical conditions. the quaternary base 1-methylpyridinium was isolated from roasted and ground coffee and purified by ion exchange and thin-layer chromatography. the compound was characterized by nuclear magnetic resonance spectroscopy ((1)h, (13)c) and mass spectrometry techniques. a liquid chromatography-electrospray ionization tandem mass spectromet ... | 2002 | 11853504 |
| coffee bean arabinogalactans: acidic polymers covalently linked to protein. | the arabinogalactan content of green coffee beans (coffea arabica var. yellow caturra) was released by a combination of chemical extraction and enzymatic hydrolysis of the mannan-cellulose component of the wall. several arabinogalactan fractions were isolated, purified by gel-permeation and ion-exchange chromatography and characterised by compositional and linkage analysis. the ag fractions contained between 6 and 8% glucuronic acid, and gave a positive test for the beta-glucosyl-yariv reagent, ... | 2002 | 11844494 |
| headspace sorptive extraction (hsse), stir bar sorptive extraction (sbse), and solid phase microextraction (spme) applied to the analysis of roasted arabica coffee and coffee brew. | headspace sorptive extraction (hsse) and stir bar sorptive extraction (sbse), two recently introduced solventless enrichment techniques, have been applied to the analysis of the headspace of arabica roasted coffee and of the headspace of the brew and of the brew itself. in both hsse and sbse enrichment is performed on a thick film of poly(dimethylsiloxane) (pdms) coated onto a magnet incorporated in a glass jacket. sampling is done by placing the pdms stir bar in the headspace (gas phase extract ... | 2002 | 11804511 |
| characterization of espresso coffee aroma by static headspace gc-ms and sensory flavor profile. | the aromas of three espresso coffee (ec) samples from different botanical varieties and types of roast (arabica coffee, robusta natural blend, and robusta torrefacto blend (special roast by adding sugar)) were studied by static headspace gc-ms and sensory flavor profile analysis. seventy-seven compounds were identified in all of the ec samples. among them, 13 key odorants have been quantified and correlated with their flavor notes by applying multivariate statistical methods. some correlations h ... | 2001 | 11714340 |
| multivariate methods for characterization and classification of espresso coffees from different botanical varieties and types of roast by foam, taste, and mouthfeel. | three espresso coffee (ec) samples of different botanical varieties and types of roast were prepared in standard conditions using an experimental ec prototype: arabica coffee, robusta natural blend, and robusta torrefacto blend (a special roast by adding sugar). the ecs were characterized with regard to the physical parameters, amount of total solids, total solids on filtrate, lipids, caffeine, trigonelline, and chlorogenic acids by hplc, and sensory descriptive analysis related to foam appearan ... | 2001 | 11600016 |
| contrasting nitrate adsorption in andisols of two coffee plantations in costa rica. | fertilizer use in coffee plantations is a suspected cause of rising ground water nitrate concentrations in the ground water-dependent central valley of costa rica. nitrate adsorption was evaluated beneath two coffee (coffea arabica l.) plantations in the central valley. previous work at one site had identified unsaturated zone nitrate retardation relative to a tritium tracer. differences in nitrate adsorption were assessed in cores to 4 m depth in andisols at this and one other plantation using ... | 2007 | 11577895 |
| potential for areawide integrated management of mediterranean fruit fly (diptera: tephritidae) with a braconid parasitoid and a novel bait spray. | the braconid wasp, fopius arisanus (sonan), a biological control agent for mediterranean fruit fly, ceratitis capitata (wiedemann), was studied in coffee, coffea arabica l. fopius arisanus, comprised 79.3% of the total parasitoids (7,014) recovered from fruits collected at three small coffee farms. data from seasonal host/parasitoid studies at a large coffee plantation also suggested that the most effective natural enemy of c. capitata in coffee may now reside in hawaii. the original parasitoids ... | 2001 | 11561838 |
| trueness-to-type and agronomic characteristics of coffea arabica trees micropropagated by the embryogenic cell suspension technique. | trueness-to-type and agronomic characteristics of trees of four coffee (coffea arabica l.) f(1) hybrid clones derived from embryogenic cell suspensions were compared with those of trees produced from in vitro microcuttings. three types of variants were observed among the 644 trees derived from embryogenic suspensions. total frequency of the variants was 2.1% for trees originating from embryogenic cell suspensions, whereas no variant was found among the trees produced from microcuttings. the vari ... | 2001 | 11560816 |
| molecular and biochemical characterization of endo-beta-mannanases from germinating coffee (coffea arabica) grains. | the activity of endo-beta-mannanase ([1-->4]-beta-mannan endohydrolase ec 3.2.1.78) is likely to be central to the metabolism of cell wall mannans during the germination of grains of coffee (coffea spp.). in the present paper, we report the cloning and sequencing of two endo-beta-mannanase cdnas (mana and manb) by different strategies from coffea arabica l.. the mana cdna was obtained by the use of oligonucleotides homologous to published sequences of other endo-beta-mannanases and manb by the u ... | 2001 | 11469596 |
| origin, diversity and evolution of nbs-type disease-resistance gene homologues in coffee trees (coffea l.). | the majority of plant disease-resistance genes (r-genes) isolated so far encode a predicted nucleotide-binding site (nbs) domain. nbs domains related to r-genes show a highly conserved backbone of amino acid motifs, which makes it possible to isolate resistance gene analogues (rgas) by pcr with degenerate primers. multiple combinations of primers with low degeneracy, designed from two conserved motifs in the nbs regions of r-genes of various plants, were used on genomic dna from coffee trees, an ... | 2001 | 11459185 |
| chlorogenic acids as a potential criterion in coffee genotype selections. | a systematic study by hplc was conducted to determine the content of chlorogenic acids in green coffee beans of the variedad colombia (coffea arabica caturra var. x híbrido de timor) and in other genotypes of interest of c. arabica, coffea canephora, híbrido de timor, and the f1 offspring derived from the crossing caturra x híbrido de timor. comparisons were made of the total content of these acids, their quantitative differences, and the presence or absence of some of them, using parametric sta ... | 2001 | 11368619 |
| optimizing headspace temperature and time sampling for identification of volatile compounds in ground roasted arabica coffee. | equilibration time and temperature were the factors studied to choose the best conditions for analyzing volatiles in roasted ground arabica coffee by a static headspace sampling extraction method. three temperatures of equilibration were studied: 60, 80, and 90 degrees c. a larger quantity of volatile compounds was extracted at 90 degrees c than at 80 or 60 degrees c, although the same qualitative profile was found for each. the extraction of the volatile compounds was studied at seven different ... | 2001 | 11312865 |
| chemical characterization of the high molecular weight material extracted with hot water from green and roasted arabica coffee. | the polysaccharides present in coffee infusions are known to contribute to the organoleptic characteristics of the drink, such as the creamy sensation perceived in the mouth known as "body", the release of aroma substances, and the stability of espresso coffee foam. to increase the knowledge about the origin, composition, and structure of the polysaccharide fraction, the high molecular weight material (hmwm) was extracted with hot water from two green and roasted ground arabica coffees: costa ri ... | 2001 | 11308325 |
| polysaccharides of green arabica and robusta coffee beans. | two independent procedures for the quantitative determination of the polysaccharide content of arabica caturra (coffea arabica var. caturra) and robusta rom (coffea canephora var. rom) green coffee beans showed that they both contained identical amounts of polysaccharide. cell wall material (cwm) was prepared from the beans and partial solubilisation of component polysaccharides was effected by sequential extraction with water, 1 m koh, 0.3% naclo2, 4 m koh and 8 m koh. the monosaccharide compos ... | 2001 | 11217967 |
| the synthesis, testing and use of 5-fluoro-alpha-d-galactosyl fluoride to trap an intermediate on green coffee bean alpha-galactosidase and identify the catalytic nucleophile. | 5-fluoro-alpha-d-galactopyranosyl fluoride was synthesized and its interaction with the active site of an alpha-galactosidase from green coffee bean (coffea arabica), a retaining glycosidase, characterized kinetically and structurally. the compound behaves as an apparently tight binding (ki = 600 nm) competitive inhibitor, achieving this high affinity through reaction as a slow substrate that accumulates a high steady-state concentration of the glycosyl-enzyme intermediate, as evidenced by esims ... | 2000 | 11128583 |
| characterization of polyphenol oxidase in coffee. | polyphenol oxidase (ppo) was characterized in partially purified extracts of leaves (ppo-l) and fruit endosperm (ppo-e) of coffee (coffea arabica l.). ppo activity was higher in early developmental stages of both leaves and endosperm of fruits. wounding or exposure of coffee leaves to methyl jasmonate increased ppo activity 1.5-4-fold. ppo was not latent and was not activated by protease treatment. ppo activity was stimulated 10-15% with sodium dodecyl sulphate (sds) at 0.35-1.75 mm, but at high ... | 2000 | 11117875 |
| characterization of microsatellite loci in coffea arabica and related coffee species. | | 2000 | 10964241 |
| single-locus inheritance in the allotetraploid coffea arabica l. and interspecific hybrid c. arabica x c. canephora. | molecular cytogenetic analysis has indicated that coffea arabica is an amphidiploid formed from the hybridization between two closely related diploid progenitor species, c. canephora and c. eugenioides. our aim was to determine the mode of inheritance in c. arabica and in a tetraploid interspecific hybrid (called arabusta) between c. arabica and c. canephora as revealed by segregation analyses of restriction fragment length polymorphism (rflp) loci markers. the observed rflp allele segregations ... | 2007 | 10739135 |
| potent odorants of raw arabica coffee. their changes during roasting. | aroma extract dilution analysis of raw arabica coffee revealed 3-isobutyl-2-methoxypyrazine (i), 2-methoxy-3,5-dimethylpyrazine (ii), ethyl 2-methylbutyrate (iii), ethyl 3-methylbutyrate (iv), and 3-isopropyl-2-methoxypyrazine (v) as potent odorants. the highest odor activity value was found for i followed by ii, iv, and v. it was concluded that i was responsible for the characteristic, peasy odor note of raw coffee. twelve odorants occurring in raw coffee and (e)-beta-damascenone were also quan ... | 2000 | 10725165 |
| xanthine degradation and related enzyme activities in leaves and fruits of two coffea species differing in caffeine catabolism. | the degradation of xanthine was studied in young and aged leaves and in immature and mature fruits of coffea arabica and coffea dewevrei, which differ with respect to caffeine catabolism. radioisotope feeding experiments showed that leaves degraded xanthine more readily than fruits but that mature fruits and aged leaves were less efficient than younger tissues. in all cases, a significant part of the recovered radioactivity was in the ureides. xanthine dehydrogenase was characterized as the enzy ... | 1999 | 10552461 |
| sensory study on the character impact odorants of roasted arabica coffee. | the potent odorants were quantified in a sample of roasted arabica coffee. on the basis of the results, 27 odorants were dissolved in an oil/water mixture. the flavor profile of the model obtained was very close to that of the real sample. in duo and triangle tests, the model was compared with models missing one or more odorants. these experiments indicated that 2-furfurylthiol, 4-vinylguaiacol, several alkyl pyrazines, furanones, acetaldehyde, propanal, methylpropanal, and 2- and 3-methylbutana ... | 1999 | 10563955 |
| molecular characterisation and origin of the coffea arabica l. genome. | restriction fragment length polymorphism (rflp) markers were used in combination with genomic in situ hybridisation (gish) to investigate the origin of the allotetraploid species coffea arabica (2n = 44). by comparing the rflp patterns of potential diploid progenitor species with those of c. arabica, the sources of the two sets of chromosomes, or genomes, combined in c. arabica were identified. the genome organisation of c. arabica was confirmed by gish using simultaneously labelled total genomi ... | 1999 | 10102360 |
| intermittent light irradiation with a second-scale interval enhances caffeine production by coffea arabica cells | we developed novel equipment that intermittently illuminates coffea arabica cell suspensions at a second-scale interval and investigated how intermittent irradiation enhances caffeine biosynthesis by c. arabica cells. the light/dark cycles consisting of 2 s of illumination and 18 s of darkness enhanced caffeine production, reaching the same level as for continuous light. the intermittent illumination increased the production efficiency regarding light consumption by a factor of 10. caffeine prod ... | 1998 | 9758671 |
| two different conductances contribute to the anion currents in coffea arabica protoplasts. | the anion conductance of the plasma membrane of coffea arabica protoplasts was isolated and characterized using the whole-cell patch clamp technique. voltage pulse protocols revealed two components: a voltage-gated conductance (gs) and a voltage-independent one (gl). gs is activated upon depolarization (e-fold activation every +36 mv) with time constants of 1 sec and 5 sec at all potentials. gl and gs also differ by their kinetic and biophysical properties. in bi-ionic conditions the current ass ... | 1997 | 9309213 |
| lipid analysis of coffea arabica linn. beans and their possible hypercholesterolemic effects. | lipid composition of green coffea arabica beans is reported with special emphasis on fatty acid composition. triacylglycerols were found to be the major lipid constituents of the coffee oil along with sterol esters, sterols/triterpene alcohol, hydrocarbons and the hydrolyzed products of triacylglycerols as the minor components. fatty acid composition of total oil, neutral lipids, polar lipids and pure triacylglycerols showed the presence of fatty acids of c14, c16, c18, and c20 carbon chains. pa ... | 1997 | 9135777 |
| chilling stress leads to increased cell membrane rigidity in roots of coffee (coffea arabica l.) seedlings. | tropical and sub-tropical higher plant species show marked growth inhibition when exposed to chilling temperatures. in root tip segments of coffee seedlings which were subjected for 6 days to temperatures of 10, 15, 20 and 25 degrees c, in darkness, we have detected an increased amount of malondialdehyde formed in the 10 degrees c treatment, accompanied by higher electrolyte leakage. the electron paramagnetic resonance (epr) technique and the fatty acid spin probes 5-, 12- and 16-doxylstearic ac ... | 1997 | 9030214 |
| biosynthesis of caffeine in leaves of coffee. | the levels of endogenous caffeine and theobromine were much higher in buds and young leaves of coffea arabica l. cv kent than in fully developed leaves. biosynthesis of caffeine from 14c-labeled adenine, guanine, xanthosine, and theobromine was observed, whereas other studies (h. ashihara, a.m. monteiro, t. moritz, f.m. gillies, a. crozier [1996] planta 198: 334-339) have indicated that there is no detectable incorporation of label into caffeine when theophylline and xanthine are used as substra ... | 1996 | 12226327 |
| a placebo-controlled parallel study of the effect of two types of coffee oil on serum lipids and transaminases: identification of chemical substances involved in the cholesterol-raising effect of coffee. | in a randomized double-blind parallel study in 36 subjects the effect on serum cholesterol of a daily dose of 2 g lipid extracted from green arabica and robusta coffee beans was studied. arabica oil elevated serum total cholesterol by 1.1 mmol/l (95% ci for the difference from placebo: 0.41, 1.73 mmol/l); the effect of robusta oil (+0.5 mmol/l) was not statistically significant (95% ci: -0.01, 0.92 mmol/l). arabica oil also raised plasma triglycerides by 0.8 mmol/l (95% ci: 0.26, 1.25 mmol/l). t ... | 1995 | 7762531 |
| a cdna encoding a metallothionein i-like protein from coffee leaves (coffea arabica). | | 1995 | 7870830 |
| detection of genetic diversity and selective gene introgression in coffee using rapd markers. | rapd (randomly amplified polymorphic dna) markers generated by arbitary decamers have been successfully employed to detect genetic polymorphisms between coffee species and between coffea arabica genotypes. the rapd profiles were used to construct dendrograms and these were consistent with the known history and evolution of coffea arabica. material originating from ethiopia and the arabica sub-groups - c. arabica var. typica and c. arabica var. bourbon - were clearly distinguished. rapd analysis ... | 1994 | 24190527 |
| the effect of environmentally induced stem temperature gradients on transpiration estimates from the heat balance method in two tropical woody species. | commercially available sap flow gauges were used to evaluate the performance of the stem heat balance (shb) technique for measuring sap flow in coffee (coffea arabica l. cv. yellow catuai) and koa (acacia koa gray) plants under greenhouse and field conditions. transpiration rates measured gravimetrically and with the shb technique were similar in greenhouse tests, provided that insulation in addition to that supplied by the gauge manufacturer was applied to reduce radiant heating in the vicinity ... | 1994 | 14967712 |
| comparative study of protein electrophoretic patterns during embryogenesis in coffea arabica cv catimor. | embryogenic and non-embryogenic calli from leaf sections of coffea arabica cv. catimor, were analyzed under denaturing conditions in one- and two-dimensions by polyacrylamide gel electrophoresis. the protein patterns revealed qualitative and quantitative differences in size and charge. in non-embryogenic calli, two dimensional analysis reveals seven distinctive polypeptides in the range of 15 to 70 kda. four of the polypeptides are acidic, three of 70 kda and one of 15 kda. similarly, in embryog ... | 1994 | 24193651 |
| separate de novo and salvage purine pools are involved in the biosynthesis of theobromine but not caffeine in leaves of coffea arabica l. | in coffea arabica leaves, the purine ring of theobromine (3,7-dimethylxanthine) and caffeine (1,3,7-trimethylxanthine) is provided by de novo purine biosynthesis: (a) [14c]glycine, [14c]bicarbonate, and [14c]formate were incorporated into inosine 5[prime]- monophosphate (imp), sum of adenine nucleotides ([sigma]ade), theobromine, and caffeine; and (b) incorporation of [14c]formate into imp, [sigma]ade, theobromine, and caffeine was inhibited by azaserine, a known inhibitor of de novo purine bios ... | 1993 | 12232013 |
| regulation of purine metabolism in intact leaves of coffea arabica. | the capacity of coffea arabica leaves (5- x 5-mm pieces) to synthesize de novo and catabolize purine nucleotides to provide precursors for caffeine (1,3,7-trimethylxanthine) was investigated. consistent with de novo synthesis, glycine, bicarbonate, and formate were incorporated into the purine ring of inosine 5[prime]-monophosphate (imp) and adenine nucleotides ([sigma]ade); azaserine, a known inhibitor of purine de novo synthesis, inhibited incorporation. activity of the de novo pathway in c. a ... | 1993 | 12232012 |
| immobilized coffea arabica cell culture using a bubble-column reactor with controlled light intensity. | coffea arabica cells immobilized by calcium alginate gel were photocultured using a bubble-column reactor under controlled light intensity. this process was carried out after their alkaloid productivity was improved by increasing the cell density in the initial gel matrix and preculturing the immobilized cells in the dark prior to light irradiation. the cells were grown in the form of a biofilm on gel beads, producing 100 mg/l of purine alkaloids in a 24-day batch culture. alkaloid production wa ... | 1993 | 18613054 |
| lipid content and composition of coffee brews prepared by different methods. | the lipid content and composition of boiled, filtered, dripped, turkish and espresso coffees prepared from roasted beans of coffea arabica and coffea robusta, and of coffees prepared from different brands of instant coffee were examined. the lipid content varied with the method of preparation. while coffee brews filtered through filter paper contained less than 7 mg lipids, those prepared by boiling without filtering and espresso coffee reached 60-160 mg lipids/150-ml cup. coffee brew filtered t ... | 1993 | 8477916 |
| canonical discriminant analysis applied to the headspace gc profiles of coffee cultivars. | chemometric methods were applied for analyzing the relationship between the classification of coffee cultivars and their volatile components. six typical cultivars were selected from coffea arabica l., and their headspace profiles were analyzed by gc and gc/ms. a canonical discriminant analysis, with gc peaks as the variables, suggested the existence of a relationship between the sensory characteristics and canonical variables. the six coffee cultivars were divided into three groups, respectivel ... | 1993 | 27280982 |
| effects of water deficit on flower opening in coffee (coffea arabica l.). | the response of coffee (coffea arabica l.) floral buds to different water deficits followed by re-irrigation was investigated. flower opening was stimulated by irrigation after one period of water deficit if predawn leaf water potential declined below -0.8 mpa. similar stimulation of flowering was observed when less severe but more prolonged water deficits (ca. -0.3 to -0.5 mpa for two weeks) were imposed, even if water deficit was relieved by re-irrigation several times during this period. cons ... | 1992 | 14969864 |
| a novel type of somatic embryogenesis in coffea arabica. | a novel type of somatic embryogenesis characterized by an efficient and highly synchronized embryo formation was observed in embryogenic callus of coffea arabica initiated on murashige and skoog medium containing kinetin (4 mg/l) and 2,4-d (1 mg/l). it occurs in suspension and goes along with the suppression of "high frequency somatic embryo induction" (hfse). this is achieved by favoring during cultivation senescence-or necrosis-like processes which apparently do not impair the competence for e ... | 1992 | 24212872 |
| plant regeneration from protoplasts of embryogenic cell suspensions of coffea arabica l. cv. caturra. | coffee plants were regenerated from protoplasts isolated from embryogenic cell suspension cultures derived from somatic embryos of coffea arabica l. cv. caturra. yields of viable protoplasts ranged from 1×10(5) to 6×10(5) protoplast/g fresh weight. protoplast preparations usually contained no contaminating cells, and when present, the number of cells never exceeded 0.1% of the total. plating efficiencies of protoplast ranged from 1 to 10%. embryogenic protocolonies obtained after several subcult ... | 1991 | 24221671 |
| calcium and phosphate effects on growth and alkaloid production in coffea arabica: experimental results and mathematical model. | plant, mammalian, and microbial cells are commonly immobilized in calcium alginate gels for the production of valuable secondary metabolites. however, calcium ions are known to inhibit growth in various types of cells, and calcium is an integral part of such gels. therefore, an investigation was conducted to evaluate the effect of calcium on the growth and alkaloid production of a model cell-line, coffea arabica, in suspension culture before, attempting to immobilize such cells in alginate. a ki ... | 1991 | 18600686 |
| biotransformation of theobromine to caffeine in suspension and polyurethane foam immobilized coffee (coffea arabica l.) cells. | coffee (coffea arabica l.) cells are capable of biotransforming theobromine to caffeine. in suspension culture of b2k medium, which is the "production medium" for caffeine, biotransformation was also more efficient than in dk medium. more caffeine was finally produced than calculated based on theobromine added to the medium. on the other hand, the efficiency of the biotransformation using immobilized cells in reticulate polyurethane foam cubes as a matrix varied with the phases. the biotransform ... | 1991 | 24213687 |
| leaf water relations and maintenance of gas exchange in coffee cultivars grown in drying soil. | plant water status, leaf tissue pressure-volume relationships, and photosynthetic gas exchange were monitored in five coffee (coffea arabica l.) cultivars growing in drying soil in the field. there were large differences among cultivars in the rates at which leaf water potential (psi(l)) and gas exchange activity declined when irrigation was discontinued. pressure-volume curve analysis indicated that increased leaf water deficits in droughted plants led to reductions in bulk leaf elasticity, osm ... | 1990 | 16667916 |
| long term culture and caffeine production of immobilized coffee (coffea arabica) l. cells in polyurethane foam. | coffee (coffea arabica l.) cells could be immobilized in polyurethane foam and subcultured repeatedly for a long time. four phases were observed for cell growth and caffeine production, i; immobilization, ii; growth, iii; caffeine production, iv; regrowth. their periods were influenced by the number of foam particles. especially in the phase iii, the immobilized cells produced a relatively large amount of caffeine in the subculture numbers 5-8 (34 cubes) when the fresh weight of the immobilized ... | 1990 | 24226594 |
| carbon isotope discrimination in coffee genotypes grown under limited water supply. | photosynthetic gas exchange, plant-water relations characteristics, and stable carbon isotope discrimination (delta) were evaluated for five coffea arabica l. genotypes growing under two soil moisture regimes in the field. the delta of leaf tissue was strongly correlated (r = -0.95) with inherent water use efficiency (ratio of assimilation to stomatal conductance; a/g). the variation in inherent water use efficiency (wue) among genotypes was 30% for plants irrigated weekly. the higher wue exhibi ... | 1990 | 16667234 |
| shade adaptation of photosynthesis in coffea arabica. | the effect of irradiance on the rate of net photosynthesis was measured for mature leaves of coffee grown under five levels of radiation from 100% to 5% daylight. the rate of light-saturated photosynthesis per unit leaf area (pnmax) increased from 2 μmol co2 m(-2) s(-1) under 5% daylight to 4.4 μmol co2 m(-2) s(-1) under 100% daylight. the photon flux density (par, photosynthetically active radiation) needed for 50% saturation of photosynthesis, as well as the light compensation point, also incr ... | 1984 | 24458775 |
| caffeine hazards and their prevention in germinating seeds of coffee (coffea arabica l.). | the inhibition of growth of seedlings of coffee (coffea arabica l.) exposed to 10 m m caffeine was found to occur in the rootlet: mitosis and cell plate formation were also inhibited. since concentrations of endogenous caffeine in the imbibed seed are 40-60 mm, 4-6 times as high as in the seedlings, we conclude that coffee embryos have specific means of avoiding caffeine autotoxicity. observations indicate that cell divisions in root tips start only after the latter are pushed away from the caff ... | 1983 | 24407803 |
| high production of caffeine and related enzyme activities in callus cultures of coffea arabica l. | callus tissue culture of coffea arabica l. cv hybrido de timor prepared from apical portions of orthotropic branches produced 49 to 92 times as much caffeine per unit weight of tissue as did the original explant. cell-free extracts made from 42 to 54-day-old callus cultures in which active biosynthesis was occurring exhibited n-methyl-n (9)-nucleoside hydrolase and n-methyltransferase enzyme activities. similar cell-free extracts exhibited selective biodegradative activity in forming urea from x ... | 1983 | 24257975 |
| n-methyltransferase activities in suspension cultures of coffea arabica l. | suspension cultures of coffea arabica l. are a useful source for methyltransferase preparations of high activity catalysing the transfer of methylgroups from s-adenosyl-l-methionine to 7-methylxanthine and to theobromine producing theobromine and caffeine respectively. surprisingly, these enzyme activities are not correlated with the availability of precursors during a culture cycle. they are highest in the growth phase when supply of precursors is reduced. mixed substrate experiments and time d ... | 1983 | 24257852 |
| purine alkaloid formation and co2 gas exchange in dependence of development and of environmental factors in leaves of coffea arabica l. | in the leaves of coffea arabica l., purine alkaloid formation was estimated by analyzing the theobromine and caffeine content and by measuring the methylation rate of [2-(14)c]theobromine to [2-(14)c]caffeine in short-term experiments (6-24 h). at the same time, growth (in terms of dry weight and area), net photosynthesis (nps), and dark respiration were determined. during leaf development, which was considered to be terminated when nps was at a maximum (60-80 μmol g(-1) s(-1)) and dark respirat ... | 1982 | 24272573 |
| coffea arabica. | | 1981 | 6941089 |
| n2 fixation (c2h 2 reduction) by epiphylls on coffee,coffea arabica. | nitrogen fixation (c2h2 reduction) by epiphylls on coffee,coffea arabica, grown in sites with different degrees of shade, was determined. coffee leaves with nitrogen-fixing epiphylls were found in all sites in approximately equal numbers. rates of c2h2 reduction were similar for all sites and throughout the year, averaging 3.21 nmoles c2h2 reduced leaf with epiphylls(-1) day(-1). apparently, neither rates of activity nor abundance of leaves with nitrogen-fixing epiphylls is related to the degree ... | 1980 | 24227230 |
| antifungal properties of 1,3,7-trimethylxanthine, isolated from coffea arabica. | | 1980 | 7422010 |
| water movement in coffee seedlings (coffea arabica l.) : evaluation of various resistances. | various resistances through the soil-plant-atmosphere continuum were measured in order to find which resistance is mainly responsible for the low leaf water potential reported in coffee plants, especially when water supply is plentiful. roots appeared to offer a major resistance in this pathway. at least under the experimental conditions mentioned here soil did not offer much resistance.it has been suggested that to complete the picture of various resistances further work should be carried out a ... | 1977 | 28308942 |
| caffeine: its direct and indirect influence on reproduction. | caffeine constitutes the active drug principle in a number of commonly consumed beverages. among north american adults, it holds the distinction as being probably the most widely utilized psychotropic drug. the compound is most often consumed in the form of coffee, which is derived from the bean of the tropical tree coffea arabica or coffea robusta. the unique pharmacologic and physiologic properties of caffeine have led to extensive research efforts, especially in the area of mutagenically and ... | 1977 | 197235 |
| [studies on coffee and coffee substitutes. xix. dependence of the quantity of a highly polymeric galactomannan on the degree of extraction coffee-extracts (author's transl)]. | in extracts of columbia arabica coffee the content of galactomannan precipitable with alcaline copper solution decreases slowly up to an extraction yield of 43.6%; it decreases somewhat more rapidly with higher extraction yields. an extract of angola robusta coffee showed opposite behaviour. in this case the content of galactomannan increased with the extraction yield, although not evenly. calculated on the basis of roasted coffee solids the extract of the arabica coffee had a rather limited ran ... | 1977 | 878640 |
| [investigation on coffee and coffee-substitutes. xvii. behaviour of polysaccharide-complexes of robusta-coffee during roasting]. | two varieties of coffea robusta of light, medium and dark roasting degree were investigated. the results were similar to those which were published earlier concerning coffea arabica. one part of the mannane and galactane is destroyed. another part, which exists originally as a constituent of the holocellulose, is made water soluble. of this part, the mannane is found in the complex of water soluble polysaccharides, the galactane in the complex of galactoarabane. | 1975 | 1229720 |
| a study of the lipid content of coffea arabica l. seeds. | | 1975 | 1161800 |
| 2-chloroethanephosphonic acid reduces transpiration and stomatal opening in coffea arabica l. | foliar sprays of 2-chloroethanephosphonic acid reduced transpiration rates per unit leaf area and stomatal apertures during the day in coffea arabica l. the effect was first detected six hours after treatment and persisted for up to five days. | 1974 | 24442781 |
| [caffeine synthesis in fruits and tissue cultures of coffea arabica]. | during fruit development the relative caffeine content of the pericarp falls from 1.68% to 0.24% on a dry weight basis, but remains more or less constant in the seed (about 1.25%). on an absolute basis, the pericarp has twice as much and the seed twenty times as much caffeine at maturity as at the beginning of fruit development. tissue cultures of seed tissue (endosperm) produce caffeine and release it into the growth medium. both pericarp and endosperm fed with nah(14)co3 synthesize ring-labell ... | 1972 | 24473913 |
| [studies on the transport of caffeine in the coffee plant (coffea arabica)]. | caffeine transport in small amounts from leaf to leaf was demonstrated by application of doubly-labelled caffeine. there was no translocation from the subtending leaves into the fruits, but heavy translocation from the pericaprp into the seed tissue could be shown. the results were confirmed by the analysis of grafts between caffeine-containing and caffeine-free species. the importance of the pericarp with respect to the caffeine content of the mature coffee bean is discussed. | 1972 | 24473741 |
| identification of abscisic acid in flower buds of coffea arabica (l.). | extracts of flower buds of coffea arabica (l.) collected before and after bud break contain abscisic acid. this was demonstrated using thin layer chromatography and gas chromatography combined with mass spectroscopy. abscisic acid accounts for about 75% of the inhibitory activity in the acidic extract. the possible role of abscisic acid in the dormancy of coffee flower buds is discussed. | 1970 | 24496937 |
| the ovule and seed of coffea arabica l. | | 1936 | 17796844 |
| comparison of antioxidant, antimicrobial activities and chemical profiles of three coffee (coffea arabica l.) pulp aqueous extracts. | this study explored the bioactivities and nutrient compositions of coffee (coffea arabica l.) pulp which was prepared in three different ways [coffee pulp extracts (cpe) 1-3]. | 2016 | 28462135 |
| effects of maltose and lysine treatment on coffee aroma by flash gas chromatography electronic nose and gas chromatography-mass spectrometry. | arabica coffee is a subtropical agricultural product in china. coffee undergoes a series of thermal reactions to form abundant volatile profiles after roasting, so it loses a lot of reducing sugars and amino acids. adding carbonyl compounds with amino acids before roasting could ensure the nutrition and flavor of coffee. the technology is versatile for the development of coffee roasting process. this investigation evaluates the effects of combining maltose and lysine (lys) to modify coffee aroma ... | 0 | 28547803 |
| n,n-dimethylpiperidinium (mepiquat) part 2. formation in roasted coffee and barley during thermal processing. | previous work in model systems has demonstrated that mepiquat can be formed under typical roasting conditions from the amino acid lysine via the maillard reaction and trigonelline, the latter alkaloid serving as a methyl donor. this study shows for the first time that mepiquat is formed in low mg kg(-1) amounts during the coffee roasting process and consequently can be detected in roast and ground as well as soluble coffee up to levels of 1.4 mg kg(-1). darker roast coffees contain relatively hi ... | 0 | 24303872 |
| rust and thinning management effect on cup quality and plant performance for two cultivars of coffea arabica l. | beverage quality is a complex attribute of coffee (coffea arabica l.). genotype (g), environment (e), management (m), post-harvest processing, and roasting are all involved. however, little is known about how g x m interactions influence beverage quality. we investigated how yield and coffee leaf rust disease (clr) (hemileia vastatrix berk. et br.) management affect cup quality and plant performance, in two coffee cultivars. sensory and chemical analysis revealed that 10 of 70 attributes and 18 ... | 2017 | 28899100 |
| hplc analysis of phenolic acids, antioxidant activity and in vitro effectiveness of green and roasted caffea arabica bean extracts: a comparative study. | coffee is a popular drink; it is one of the most commercialized food products and a rich source of biologically active compounds that are important for human health. this study aimed to prove the anticancer activity of green coffee (gc) and roasted coffee (rc) bean aqueous extracts (coffea arabica) on breast cancer adenocarcinoma cell line (mcf-7) and the safety of both extracts on normal human peripheral blood lymphocytes culture (hpbl). total phenolic content for gc and rc extracts was measure ... | 2018 | 29366428 |
| maturation periods for coffea arabica cultivars and their implications for yield and quality in brazil. | the climate conditions affects directly the maturation period of coffee plantations affecting yield and beverage quality. the quality of coffee beverages is highly correlated with the length of fruit maturation, which is strongly influenced by meteorological elements. the objective was to estimate the probable times of graining and maturation of the main coffee varieties in brazil and to quantify the influences of climate on coffee maturation. we used degree-days to estimate flowering/graining p ... | 2018 | 29364531 |
| integrative analysis of the late maturation programme and desiccation tolerance mechanisms in intermediate coffee seeds. | the intermediate seed category was defined in the early 1990s using coffee (coffea arabica) as a model. in contrast to orthodox seeds, intermediate seeds cannot survive complete drying, which is a major constraint for seed storage, for both biodiversity conservation and agricultural purposes. however, intermediate seeds are considerably more tolerant to drying than recalcitrant seeds, which are highly sensitive to desiccation. to gain insight into the mechanisms governing such differences, chang ... | 2018 | 29361125 |
| multi-scale measurements show limited soil greenhouse gas emissions in kenyan smallholder coffee-dairy systems. | efforts have been made in recent years to improve knowledge about soil greenhouse gas (ghg) fluxes from sub-saharan africa. however, data on soil ghg emissions from smallholder coffee-dairy systems have not hitherto been measured experimentally. this study aimed to quantify soil ghg emissions at different spatial and temporal scales in smallholder coffee-dairy farms in murang'a county, central kenya. ghg measurements were carried out for one year, comprising two cropping seasons, using vented st ... | 2018 | 29348066 |
| 16-o-methylcafestol is present in ground roast arabica coffees: implications for authenticity testing. | high-field and low-field proton nmr spectroscopy were used to analyse lipophilic extracts from ground roast coffees. using a sample preparation method that produced concentrated extracts, a small marker peak at 3.16 ppm was observed in 30 arabica coffees of assured origin. this signal has previously been believed absent from arabicas, and has been used as a marker for detecting adulteration with robusta. via 2d 600 mhz nmr and lc-ms, 16-o-methylcafestol and 16-o-methylkahweol were detected for t ... | 2018 | 29329870 |
| population genomic footprints of host adaptation, introgression and recombination in coffee leaf rust. | coffee leaf rust, caused by hemileia vastatrix (hv), represents the biggest threat to coffee production worldwide and ranks amongst the most serious fungal diseases in history. despite a recent series of outbreaks and emergence of hyper-virulent strains, the population evolutionary history and potential of this pathogen remains poorly understood. to address this issue, we used radseq to generate ∼19,000 snps across a worldwide collection of 37 hv samples. contrarily to the longstanding idea that ... | 2018 | 29328532 |
| genome-wide association study reveals candidate genes influencing lipids and diterpenes contents in coffea arabica l. | lipids, including the diterpenes cafestol and kahweol, are key compounds that contribute to the quality of coffee beverages. we determined total lipid content and cafestol and kahweol concentrations in green beans and genotyped 107 coffea arabica accessions, including wild genotypes from the historical fao collection from ethiopia. a genome-wide association study was performed to identify genomic regions associated with lipid, cafestol and kahweol contents and cafestol/kahweol ratio. using the d ... | 2018 | 29323254 |
| green coffee seed residue: a sustainable source of antioxidant compounds. | oil extraction from green coffee seeds generates residual mass that is discarded by agribusiness and has not been previously studied. bioactive secondary metabolites in coffee include antioxidant phenolic compounds, such as chlorogenic acids. coffee seeds also contain caffeine, a pharmaceutically important methylxanthine. here, we report the chemical profile, antioxidant activity, and cytotoxicity of hydroethanolic extracts of green coffea arabica l. seed residue. the extracts of the green seeds ... | 2018 | 29291876 |
| a high throughput molecular pipeline reveals the diversity in prevalence and abundance of pratylenchus and meloidogyne species in coffee plantations. | coffee yields are adversely affected by plant-parasitic nematodes and the pathogens are largely under-reported because a simple and reliable identification method is not available. we describe a pcr-based approach to rapidly detect and quantify the major pratylenchus and meloidogyne nematode species that are capable of parasitising coffee. the procedure was applied to soil samples obtained from a number of coffee farms in brazil, vietnam and indonesia to assess the prevalence of these species as ... | 2018 | 29291356 |
| mid infrared spectroscopy and chemometrics as tools for the classification of roasted coffees by cup quality. | sensory (cup) analysis is a reliable methodology for green coffee quality evaluation, but faces barriers when applied to commercial roasted coffees due to lack of information on roasting conditions. the aim of this study was to examine the potential of mid-infrared spectroscopy for predicting cup quality of arabica coffees of different roasting degrees. pca analysis showed separation of arabica and robusta. a two-level pls-da hierarchical strategy was employed, with coffee being classified as hi ... | 2018 | 29287322 |
| assessing polyphenols content and antioxidant activity in coffee beans according to origin and the degree of roasting | the roasting stage constitutes a key component in the manufacturing process of natural coffee because temperature elicits changes in bioactive compounds such as polyphenols and that maillard-reaction compounds appear, thus affecting the product’s sensory and antioxidant properties. actual contents of these compounds may depend on which region the coffee is cultivated as well as the extent to which the beans are roasted | 2017 | 29265388 |
| cafestol, a coffee diterpene, inhibits urotensin ii-induced interleukin-8 expression in human umbilical vein endothelial cells. | cafestol, a diterpene molecule found in the berries of coffea arabica l. (rubiaceae), has been shown to exercise anti-angiogenic and anti-tumorigenic effects. however, cafestol's cellular mechanism has yet to be fully investigated. we previously demonstrated that urotensin ii enhanced interleukin-8 secretion by endothelial cells, thereby increasing endothelial cell proliferation. urotensin ii may also participate in angiogenesis and tumor infiltration by macrophages. however, the effects of cafe ... | 2018 | 29246853 |
| scale insects (hemiptera: coccoidea) associated with arabica coffee and geographical distribution in the neotropical region. | coffee is one of the most important brazilian agricultural commodities exported, and minas gerais and espírito santo states are the main coffee producers. scale insects are important coffee pests, and 73 species of cerococcidae (3), coccidae (18), diaspididae (6), eriococcidae (1), ortheziidae (3), pseudococcidae (21), putoidae (2) and rhizoecidae (19) have been associated with roots, branches, leaves, flowers and fruits of arabica coffee in the neotropics. eight species were found associated wi ... | 2018 | 29236860 |
| influence of environmental conditions and genetic background of arabica coffee (c. arabica l) on leaf rust (hemileia vastatrix) pathogenesis. | global warming is a major threat to agriculture worldwide. between 2008 and 2013, some coffee producing countries in south and central america suffered from severe epidemics of coffee leaf rust (clr), resulting in high economic losses with social implications for coffee growers. the climatic events not only favored the development of the pathogen but also affected the physiological status of the coffee plant. the main objectives of the study were to evaluate how the physiological status of the c ... | 2017 | 29234340 |
| impact of storage conditions on fungal community composition of green coffee beans coffea arabica l. stored in jute sacks during 1 year. | the purpose of this study was to evaluate the effect of warehouse storage conditions on the composition of the fungal community of green coffee beans (gcb) that were stored in jute sacks for 1 year. | 2018 | 29215772 |
| suppression of mediterranean fruit fly (diptera: tephritidae) with trimedlure and biolure dispensers in coffea arabica (gentianales: rubiaceae) in hawaii. | to assess the potential to suppress mediterranean fruit fly, ceratitis capitata (wiedemann; diptera: tephritidae), via mass trapping with trimedlure (tml), we compared fly catch (as catch per trap per time period) provided by either a novel, solid, triple-lure dispenser with tml, methyl eugenol (me), and raspberry ketone (rk) (tmr) or solid tml plugs, both without insecticides, in addition to biolure bait stations. work was done in a coffee plantation that had a dense c. capitata population. thr ... | 2017 | 29186466 |
| kahweol decreases hepatic fibrosis by inhibiting the expression of connective tissue growth factor via the transforming growth factor-beta signaling pathway. | kahweol is a diterpene molecule found in coffea arabica beans. previous studies have shown that coffee reduces liver fibrosis, but it is not clear which component of coffee has the protective effect. in this study, we examined whether kahweol has a protective effect on hepatic fibrosis in vivo and in vitro. kahweol decreased hepatic fibrosis by inhibiting connective tissue growth factor (ctgf) expression in thioacetamide (taa)-treated mice. the expression of phospho-smad3, signal transducer and ... | 2017 | 29152065 |
| temperature-dependent models of development and survival of an insect pest of african tropical highlands, the coffee antestia bug antestiopsis thunbergii (hemiptera: pentatomidae). | the antestia bug antestiopsis thunbergii (hemiptera: pentatomidae) is a major pest of arabica coffee in african tropical highlands. it feeds on coffee plant vegetative parts and berries leading to a direct reduction in coffee yield and quality. this study aimed to determine a. thunbergii thermal requirements, and to obtain new information on the pest demography as influenced by temperature. temperature-dependent models were developed using the insect life cycle modelling software (ilcym) through ... | 2017 | 29108555 |
| post-harvest practices linked with ochratoxin a contamination of coffee in three provinces of cordillera administrative region, philippines. | one of the emerging concerns in the cordillera administrative region, philippines is ochratoxin a (ota) contamination in coffee. during 2015 to 2016, a total of 51 arabica (coffea arabica) coffee samples from benguet province and 71 robusta (coffea canephora var. robusta) coffee samples from the provinces of ifugao and kalinga were analysed for ota contamination. the ota-producing fungal contaminants during drying and storage of arabica and robusta coffee were aspergillus niger and aspergillus o ... | 2017 | 29087787 |
| metabarcoding analyses enable differentiation of both interspecific assemblages and intraspecific divergence in habitats with differing management practices. | spatial and temporal collections provide important data on the distribution and dispersal of species. regional-scale monitoring invariably involves hundreds of thousands of samples, the identification of which is costly in both time and money. in this respect, metabarcoding is increasingly seen as a viable alternative to traditional morphological identification, as it eliminates the taxonomic bottleneck previously impeding such work. here, we assess whether terrestrial arthropods collected from ... | 2017 | 29069398 |
| long-read sequencing of the coffee bean transcriptome reveals the diversity of full-length transcripts. | polyploidization contributes to the complexity of gene expression, resulting in numerous related but different transcripts. this study explored the transcriptome diversity and complexity of the tetraploid arabica coffee (coffea arabica) bean. long-read sequencing (lrs) by pacbio isoform sequencing (iso-seq) was used to obtain full-length transcripts without the difficulty and uncertainty of assembly required for reads from short-read technologies. the tetraploid transcriptome was annotated and c ... | 2017 | 29048540 |
| screening for 16-o-methylcafestol in roasted coffee by high-performance thin-layer chromatography-fluorescence detection - determination of coffea canephora admixtures to coffea arabica. | 16-o-methylcafestol (16-omc), the characteristic diterpene exclusively present in coffea canephora, is an excellent marker for coffea canephora admixtures to coffea arabica. here we show a straightforward, selective and sensitive screening method for the determination of 16-omc in roasted coffee by high-performance thin-layer chromatography with fluorescence detection (hptlc-fld). as internal standard, sudan iv was used, and a direct saponification with 10% ethanolic potassium hydroxide solution ... | 2017 | 29042111 |
| flight activity and field infestation relationships for coffee berry borer in commercial coffee plantations in kona and kau districts, hawaii. | the coffee berry borer (cbb), hypothenemus hampei ferrari (coleoptera: curculionidae: scolytinae) is a recent invader to hawaii. to date, limited information regarding the seasonal phenology of this pest on the islands limits the implementation of integrated control strategies. as part of a coffee farmer training program, we monitored cbb flight activity in 15 coffee plantations (kona and kau districts) over 10 mo with methanol-ethanol (3:1 ratio) baited traps. concurrently, we quantified cbb in ... | 2017 | 29029300 |
| genetic diversity among 16 genotypes of coffea arabica in the brazilian cerrado. | for the selection of coffee plants that have favorable characteristics, it is necessary to evaluate variables related to production. knowledge of the genetic divergence of arabica coffee is of extreme importance, as this knowledge can be associated with plant breeding programs in order to combine genetic divergence with good productive performance. the objective of this study was to evaluate the genetic divergence among 16 genotypes of coffea arabica with the purpose of identifying the most diss ... | 2017 | 28973771 |
| the coffee berry borer (coleoptera: curculionidae) in puerto rico: distribution, infestation, and population per fruit. | the coffee berry borer (cbb) (hypothenemus hampei: ferrar) was first detected in puerto rico in 2007. its distribution since then has been extensive, but not extensively documented. an island-wide survey was carried out from august to november 2014 (the coffee production season) to assess cbb distribution, infestation, and population per fruit. the cbb was well-established throughout the coffee-growing area of puerto rico, but was not evenly distributed. infestation (or percentages of fruits per ... | 2017 | 28931153 |