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PubMed1996

Varying plant density and harvest time to optimize cowpea leaf yield and nutrient content.

Plant density and harvest time were manipulated to optimize vegetative (foliar) productivity of cowpea [Vigna unguiculata (L.) Walp.] canopies for future dietary use in controlled ecological life-support systems as vegetables or salad greens. Productivity was measured as total shoot and edible dry weights (DW), edible yield rate [(EYR) grams DW per square meter per day], shoot harvest index [(SHI) grams DW per edible gram DW total shoot], and yield-efficiency rate [(YER) grams DW edible per square meter per day per grams DW nonedible]. Cowpeas were grown in a greenhouse for leaf-only harvest at 14, 28, 42, 56, 84, or 99 plants/m2 and were harvested 20, 30, 40, or 50 days after planting (DAP). Shoot and edible dry weights increased as plant density and time to harvest increased. A maximum of 1189 g shoot DW/m2 and 594 g edible DW/m2 were achieved at an estimated plant density of 85 plants/m2 and harvest 50 DAP. EYR also increased as plant density and time to harvest increased. An EYR of 11 g m-2 day-1 was predicted to occur at 86 plants/m2 and harvest 50 DAP. SHI and YER were not affected by plant density. However, the highest values of SHI (64%) and YER (1.3 g m-2 day-1 g-1) were attained when cowpeas were harvested 20 DAP. The average fat and ash contents [dry-weight basis (dwb)] of harvested leaves remained constant regardless of harvest time. Average protein content increased from 25% DW at 30 DAP to 45% DW at 50 DAP. Carbohydrate content declined from 50% DW at 30 DAP to 45% DW at 50 DAP. Total dietary fiber content (dwb) of the leaves increased from 19% to 26% as time to harvest increased from 20 to 50 days.

Biomass↗
PubMed1994

Early leaf harvest reduces yield but not protein concentration of cowpea seeds.

Five greenhouse-grown cowpea [Vigna unguiculata (L.) Walp] cultivars were tested in a generalized random complete-block design to determine the effect of early leaf harvest on dry weight and protein concentration of plant parts at maturity. The most recent, fully expanded leaves on each branch from one group of plants were harvested at 5 and 7 weeks after planting. On the other groups of plants, no early leaf harvest was performed. Dry weight and protein concentration (dry weight basis) were determined for leaves, stems, and seeds at maturity and for leaves harvested early. Weight and protein concentration of seeds, leaves, and stems differed significantly between cultivars; protein concentration of leaves harvested at 5 or 7 weeks did not. Dry weight of leaves harvested at 5 vs. 7 weeks did not differ significantly, but leaf protein concentration was significantly higher at 5 weeks compared to 7 weeks. Across all cultivars, early leaf harvest had no significant effect on leaf or stem weight per plant at maturity. However, there was a significant decrease in seed weight when leaves were harvested early. Results suggest that even limited leaf harvest at 5 and 7 weeks has detrimental effects on yield, but not on protein concentration, of cowpea seeds harvested at maturity.

Agriculture↗
PubMed1998

Intracanopy lighting of cowpea canopies in controlled environments.

Traditional designs for plant-growth lighting in space life support systems irradiate tops of closed foliar canopies while canopy understories are light limited. "Intracanopy lighting," a technique whereby plants are allowed to grow up and around multiple layers of low-intensity lamps that irradiate interior portions of canopies, can potentially enhance productivity while reducing overall energy consumption. Intracanopy lighting of cowpea (Vigna unguiculata L. Walp) was optimized by varying stand densities and lining growth compartments with light-scattering or reflective films. Yield rates using intracanopy lighting were less than those obtained with traditional lighting strategies. However, yield efficiencies and energetic conversion efficiencies, parameters that put edible yield in terms of inedible biomass, energetic, spatial, and temporal penalties, indicate intracanopy lighting is more efficient in crop production. Single-leaf photosynthetic rates indicate all leaves participate in net carbon gain regardless of age and position within a canopy.

Biomass↗
PubMed2001

Intracanopy lighting reduces electrical energy utilization by closed cowpea stands.

The high planting densities needed to grow edible biomass in sustainable space life support systems will create problems for planophile crops that form closed, self-shading canopies. The use of traditional overhead-lighting configurations will reduce the penetration of photosynthetically active radiation (PAR) into such canopies and will result in substantial shading of understory leaves. Intracanopy lighting, an irradiation approach that allows plants to grow around fixed arrays of low-intensity lamps, reduces overall energy expenditure for crop production by improving light distribution and interception throughout the canopy. Comparing different fluorescent lamp geometries within vegetative canopies of cowpea (Vigna unguiculata L. Walp) revealed great plasticity of leaf orientation to maximize absorption of PAR from lamps arrayed at various nontraditional angles. Varying the amount of photosynthetic energy available within canopies creates considerable potential to manipulate canopy productivity. Increasing lamp number 38% within cowpea canopies raised stand productivity 45%, reflecting the highly efficient interception and absorption of intracanopy PAR. However, combined above/within-canopy lighting did not increase overall PAR interception and vegetative yield, and productivity did not improve relative to the same input wattage of intracanopy lighting alone. Optimization of intracanopy lighting for crops to be used in future space life support systems will substantially reduce power and energy burdens for food-crop production.

Biomass↗
PubMed2002

Reproducible transformation in two grain legumes--soybean and azuki bean--using different systems.

Two plasmid vectors were introduced into soybean (Glycine max (L.) Merr.) and azuki bean (Vigna angularis Willd. Ohwi and Ohashi) using different transformation systems. Azuki bean epicotyl explants were prepared from etiolated seedlings and co-cultivated with Agrobacterium tumefaciens for 2 days. Adventitious shoots were developed from the callus of the explants on a regeneration medium containing hygromycin, and the shoots were excised and transferred to a rooting medium containing hygromycin at the same concentration. Rooting shoots were transferred to soil and grown in a glass-house to produce viable seeds. PCR analysis confirmed clearly the presence of the hpt gene in most of the azuki beans regenerated under hygromycin selection. A soybean embryogenic suspension culture was generated from immature cotyledons, and used for the introduction of plasmids by particle bombardment. Hygromycin-resistant embryogenic clones were isolated after 8 weeks of hygromycin selection, and then the green clones were matured on the differentiation medium. After desiccation, the embryos were germinated on the rooting medium, and the plants were transferred to soil in a glass-house. More than 50% of the regenerated soybean plants tolerant to hygromycin yielded the hpt fragment on PCR analysis. The azuki bean transformants were obtained more rapidly and with higher efficiency than the soybean transformants.

Fabaceae↗
PubMed2002

Amelioration of mercurial toxicity by manganese. I. A case study in mung bean seedling.

Mercury, a non essential element renders inhibitory effect on many physiological activities of plants even at a low concentration. Plants absorb "Hg" from soil through root system. Manganese, an essential element has been found to counter the inhibitory effect of mercury mostly by preventing it's uptake from soil. Mung bean (Vigna radiata L. Wilczek) cv. Pusa Baisakhi grown in individual (1, 10, 100 and 1000 ppm) solution of Hg and Mn showed varied uptake of these heavy metals. However, in combined solutions (1 : 1, 10 : 1 and 1 : 10 ppm Hg : Mn), mercury uptake was mostly prevented in presence of 10 ppm Mn, indicating it's ameliorating effect.

Drug Interactions↗
PubMed2002

Individual and combined effect of mercury and manganese on phenol and proline content in leaf and stem of mungbean seedlings.

Mungbean (Vigna radiata L. Wilczelk cv. Pusa Baisakhi seedlings were raised in individual (0, 1, 10, 100 and 1000 ppm) and combined solutions (1 : 1, 10: 1, 1: 0 ppm Hg : Mn) of mercury and manganese for 6 days. Phenol and proline were found to accumulate in leaves in response to treatment with heavy metals. The magnitude of accumulation correlated with concentration of metals. However, a reverse trend was noticed in stem for phenol. Accumulation of phenol in response to heavy metal treatment was organ specific and occurred at higher rate in plant parts, which faced the stress mostly. However, accumulation of proline helped the plant to survive stress situation. In combined solutions, amelioration of mercurial toxicity by manganese was recorded.

Drug Interactions↗
PubMed2002

The use of legume trap crops for control of Striga hermonthica (Del.) Benth. in sorghum (Sorghum bicolor L. Moench) in northern Nigeria.

Two different field trials (one trial on sorghum intercropped with groundnut [Arachis hypogaea L.], and another trial on sorghum intercropped with bambara groundnut [Vigna subterranea L. Verdc.]) were conducted during the 1995 and 1996 rainy seasons at the Teaching and Research Farm of the Department of Crop Science, Faculty of Agriculture, University of Maiduguri, Maiduguri (11 degrees 51' N; 13 degrees 15' E) to evaluate the effect of intercropping resistant and susceptible sorghum varieties with the two legume crops for the control of Striga hermonthica (Del.) Benth, in sorghum. The sorghum varieties used for both trials were ICSV 1002, ICSV 1007 (resistant varieties) and War-warabashi (susceptible). Ex-Dakar variety of groundnut was used for the sorghum-groundnut trial, while a creamed brown eyed local bambara groundnut was used for the sorghum-bambara groundnut trial. There were six treatments with the groundnut trial and nine treatments with the bambara trial and all were laid out in a randomised complete block design (RCBD) replicated four times. In the sorghum-groundnut trial, the results show that the intercropping of sorghum with groundnut significantly reduced Striga infestation up to 50% in sorghum in both years. Both resistant varieties supported significantly fewer number of Striga on sorghum when intercropped with groundnut compared with the sole sown susceptible variety. In both years and the combined analyses of 1995 and 1996 data, however, there was no significant difference in grain yield of sorghum due to the treatments. In the sorghum-bambara groundnut trial, the results show that Striga shoot count at harvest in sole sown ICSV 1007 was significantly lower than the ICSV 1002 variety, while the susceptible variety supported significantly higher Striga shoot count than the resistant varieties in both years and the combined analyses. Alternating stands of sorghum and bambara groundnut within the same row, in general, reduced Striga shoot count in all the varieties with a range of 56%-91% reduction than intercropping with sorghum varieties in alternate rows with bambara groundnut with a range of 45%-96% reduction, or sole sorghum of each variety. This resulted in significantly higher grain yield of ICSV 1002 (1175.0 kg ha-1 in 1995, 814.8 kg ha-1 in 1996, and 994.9 kg ha-1 in the combined data) than ICSV 1007 (892.6 kg ha-1 in 1995, 666.7 kg ha-1 in 1996, and 779.6 kg ha-1 in the combined data) when both were planted in alternate stands in the same row with bambara groundnut. This studies have confirmed the potentials of groundnut and bambara groundnut as trap crops in the management of S. hermonthica in sorghum under a dried environment.

Agriculture↗
PubMed2002

Effect of diatomaceous earths Fossil Shield and Silico-Sec on the egg laying behaviour of Callosobruchus maculatus (F.) (Coleoptera: Bruchidae).

The pulse beetle, Callosobruchus maculatus (F.) is a destructive pest of pulses in both storage and field. It is well known that diatomaceous earth (DE) kill the insects by locally absorbing the epicuticular lipid layers leading to high rate of water loss through the cuticle. However, the effectiveness of DE depends on its ability to kill the adults before copulation and egg-laying. Newly emerged virgin males and females of Callosobruchus maculatus (F.) were exposed to the DEs, Fossil-Shield and Silico-Sec on 30 treated mungbeans (Vigna radita (L)). Fecundity, number of beans used for egg-laying and beans without eggs were evaluated after four days; the number of unhatched eggs was evaluated after ten days. It was determined, that the fecundity of female insects decreased sigmoidely with increasing rate of DE content. Percentages of unhatched eggs and seeds without eggs increased with increasing DE dosages. However, the maximum egg densities (eggs per used secd) occurred at 1200 mg DE/kg for Fossil-Shield and Silico-Sec. The reason for such DE-stimulated behaviour of egg laying expressed as a number of seeds with eggs of C. maculatus is not known, but it may be related to the stress caused by the inert dusts or to the reduction of both chemical and physical (tactile) stimuli. Treatment with DEs altered the surface texture of the beans and caused less cohesion between eggs and the seed surface. Only few larvae managed to penetrate into the grains, possibly due to increased grain roughness and repellent effect of DE. A relatively high number of eggs were laid on the surface of those beans where the amount of dust had been locally reduced by adults' movement and their pick up of DE. Therefore, several larvae tried to penetrate into these treated beans, causing a high larval density per partially cleaned bean. All these reasons lead to a progeny decline.

Animals↗
PubMed1992

Fungi associated with stored unprocessed cowpea and groundnut varieties available in Borno State, Nigeria.

Five stored unprocessed cowpea (Vigna spp) and four groundnut (Arachis hypogeae) varieties available in Borno State were examined for the mould flora. The degree of infestation of the grains ranged from 31% to 100% and 68% to 86% for surface sterilized cowpea and groundnut respectively. The mould flora commonly encountered were species of the genera Aspergillus. Penicillium species, Scopulariopsis species and Trichoderma species were also found. The flora of the cowpea was dominated by Aspergillus niger while Aspergillus flavus was the dominant mould on groundnut.

Aspergillus flavus↗
PubMed1992

Reconstitution of transport function of vacuolar H(+)-translocating inorganic pyrophosphatase.

A procedure for reconstitution of the transport function of the vacuolar H(+)-translocating inorganic pyrophosphatase (H(+)-PPase; EC 3.6.1.1) prepared from etiolated hypocotyls of Vigna radiata (mung bean) is described. The method entails sequential extraction of isolated vacuolar membrane (tonoplast) vesicles with deoxycholate and CHAPS (3-[(3-cholamidopropyl)-dimethylammonio]-1-propanesulfonate), combination of CHAPS-solubilized protein with phospholipid-cholesterol mixtures, dialysis, and glycerol density gradient centrifugation. The final proteoliposome preparation is 9-fold enriched for PPase activity and active in pyrophosphate (PPi)-energized electrogenic H(+)-translocation. Since both PPi hydrolysis and PPi-dependent H(+)-translocation by the proteoliposomes are indistinguishable from the corresponding activities of native tonoplast vesicles, the functional integrity of the H(+)-PPase appears to be conserved during solubilization and reconstitution. The high transport capacity and amenability of the reconstituted enzyme to both radiometric membrane filtration and fluorimetric H(+)-translocation assays, on the other hand, demonstrate its applicability to a broad range of transport studies. SDS-polyacrylamide gel electrophoresis of the proteoliposomes reveals selective enrichment of the M(r) 66,000, substrate-binding subunit of the H(+)-PPase and two additional polypeptides of M(r) 21,000 and 20,000. Although the M(r) 21,000 and 20,000 polypeptides have not been described previously, all attempts to reconstitute H(+)-PPase lacking these components were unsuccessful. It is therefore tentatively proposed that the M(r) 21,000 and 20,000 polypeptides, as well as the M(r) 66,000 subunit, are required for the productive reconstitution of PPi-dependent H(+)-translocation.

Biological Transport↗
PubMed1992

Endo-xyloglucan transferase, a novel class of glycosyltransferase that catalyzes transfer of a segment of xyloglucan molecule to another xyloglucan molecule.

Xyloglucans are the major component of plant cell walls and bind tightly to the surface of individual cellulose microfibrils, thereby cross-linking them into a complex polysaccharide network of the cell wall. The cleavage and reconnection of xyloglucan cross-links are considered to play the leading role during chemical processes essential for wall expansion and, therefore, cell growth and differentiation. Although it is hypothesized that some transglycosylation is involved in these chemical processes, the enzyme responsible for the reaction was not identified. We have now purified a novel class of endo-type glycosyltransferase to apparent homogeneity from the extracellular space or the cell wall of the epicotyls of Vigna angularis, a bean plant. The enzyme is a glycoprotein with a molecular mass of about 33 kDa. The enzyme catalyzes both 1) endo-type splitting of a xyloglucan molecule and 2) linking of a newly generated reducing end of the xyloglucan to the nonreducing end of another xyloglucan molecule, thereby mediating the transfer of a large segment of the xyloglucan to another xyloglucan molecule. The transferase exhibits no glycosidase or glycanase activity. Substrate specificity of the enzyme was investigated using several polysaccharides with different glycosidic linkages as donor substrates and pyridylamino oligosaccharides as acceptor substrates, in which the reducing end of the carbohydrate was tagged with a fluorescent group. The enzyme required a basic xyloglucan structure, i.e. a beta-(1-->4)-glucosyl backbone with xylosyl side chains, for both acceptor and donor activity. Galactosyl or fucosyl side chains on the main chain were not required for the acceptor activity. The enzyme exhibited higher reaction rates when xyloglucans with higher M(r) were used as donor substrates. Xyloglucans smaller than 10 kDa were no longer the donor substrate. On the other hand, pyridylamino heptasaccharide acted as a good acceptor as did xyloglucan polymers. Based on these results we propose to designate this novel enzyme a xyloglucan: xyloglucano-transferase, to be abbreviated endo-xyloglucan transferase (EXT) or xyloglucan recombinase. This enzyme is the first enzyme identified that mediates the transfer of a high M(r) segment between polysaccharide molecules to generate chimeric polymers. We conclude that endo-xyloglucan transferase functions as a reconnecting enzyme for xyloglucans and is involved in the interweaving or reconstruction of cell wall matrix, which is responsible for chemical creepage that leads to morphological changes in the cell wall.

Carbohydrate Sequence↗
PubMed2003

Effect of sugars on the association between cowpea vicilin (7S storage proteins) and fungal cells.

Vicilins (7S storage proteins) found in various legume seeds have been previously shown to interfere with the germination of spores or conidia of phytopathogenic fungi and inhibit yeast growth and glucose stimulated acidification of the medium by yeast cells. In the present work vicilins from cowpea (Vigna unguiculata) seeds were added to the growth medium of Saccharomyces cerevisiae cells and Fusarium oxysporum conidia. Helix pomatia lectin, wheat germ agglutinin and Ulex europaeus lectin were used to identify differences in the binding of the vicilins to the surface of cells of S. cerevisiae and F. oxysporum treated with this protein. After the growth period, the material in suspension (yeast cells) was centrifuged and the final pellet was also treated with different sugar (glucose, sucrose, glucosamine, N-acetyl-glucosamine) concentrations and 0.1 M HCl for extraction of vicilins associated to chitinous structures present in yeast cells. Our results showed that vicilin sub-units were present in the different sugar extracts of yeast cells pretreated with the vicilins and these proteins were eluted by 0.5 M solutions of sugars in the following order of efficiency of elution: N-acetyl-glucosamine, sucrose/glucose and glucosamine.

Acetylglucosamine↗
PubMed2003

Effect of kinetin on leaf protein content and its profile in mung bean under salt stress.

Application of NaCl resulted in about 67% reduction in amino acid content and 24% reduction in buffer soluble protein content in mung bean [Vigna radiata (L.) Wilczek.] leaf as compared with the control. Gel electrophoretic profile of buffer soluble protein content in leaf of mung bean showed an extra band in between 29 kD and 45 kD in stress protein profile as compared with control. It was noted that the foliar spray of kinetin (6-furfuryl aminopurine) used in the present study was able to overcome up to certain extent the adverse effects of stress caused by NaCl.

Adenine↗
PubMed2004

Alterations in fruit and vegetable beta-carotene and vitamin C content caused by open-sun drying, visqueen-covered and polyethylene-covered solar-dryers.

This study investigated the effects of three drying methods (open sun drying, visqueen-covered solar dryer and polyethylene-covered solar dryer) on b-carotene and vitamin C content of edible portions of mango fruit (Mangifera indica) and cowpea leaves (Vigna unguiculata). Commercial samples were analysed for vitamin C by titrimetry and b-carotene by spectrophotometry at 450 nm. Differences in vitamin retention and loss associated with the three drying methods were assessed by analysis of variance and least significant difference (LSD) at (p<0.05. The fresh cowpea leaf b-carotene and vitamin C content was 140.9 and 164.3 mg / 100g DM respectively and decreased (p<0.05) with drying. Open sun drying method caused the greatest b-carotene and vitamin C loss (58% and 84% respectively), while the visqueen-covered solar dryer caused the least loss (34.5% and 71% respectively). Blanching cowpea leaves improved b-carotene and vitamin C retention by 15% and 7.5% respectively. The b-carotene and vitamin C content of fresh ripe mango fruit was 5.9 and 164.3 mg/100g DM respectively. Similar to effects on cowpea leaves, the mango micronutrient content decreased (p<0.05) with drying. The open sun drying method caused the greatest b-carotene (94.2%) and vitamin C (84.5%) loss, while the visqueen-covered solar dryer caused the least (73 and 53% respectively). These results show that the three solar drying methods cause significant loss of pro-vitamin A and vitamin C in dried fruits and vegetables. However, open sun drying causes the most loss and the visqueen-covered solar dryer the least, making the later a probable better drying technology for fruit and vegetable preservation. The drying technologies should be improved to enhance vitamin retention.

Ascorbic Acid↗
PubMed2005

Effects of of habitats and pesticides on aerobic capacity and survival of soil fauna.

OBJECTIVE: Faunal health is largely dependent on their soil environment and available litter quality. So the effects of different soil habitats and pesticides on citrate synthase (CS) activity of soil fauna and its population were studied. METHODS: The soil animals were collected from different pedoecosystems for habitat study. Whereas Vigna radiata based system was selected for pesticidal observations. The field was divided into five equal plots for control and treatment of gamma-BHC, quinalphos, carbaryl and cypermethrin. Soil fauna was collected by quadrat method and extracted by Tullgren funnel. Individuals of a species having similar sizes were collected for the estimation of CS activity. They were homogenized and fractions were obtained by differential centrifugation. The activity of CS was assayed spectrophotometrically. RESULTS: Citrate synthase (CS) activity of beetle (Rasphytus fregi), woodlouse (Porcellio laevis) and centipede (Scolopendra morsitans) varied significantly with respect to changes in different soil habitats. Though the CS activity of R. fregi, P. laevis, and S. morsitans differed among themselves but the highest activity of CS in these animals was in V. radiata and lowest in A. nilotica based pedoecosystem. The aerobic capacity of centipede was maximum followed by woodlouse and beetle. The treatment of gamma-BHC, quinalphos, carbaryl and cypermethrin significantly reduced the CS activity of these animals. Gamma-BHC showed maximum reduction in CS activity indicating highly toxic effect of organochlorine on aerobic metabolism of soil fauna. However, minimum reduction was observed in response to carbaryl (in beetle) or cypermethrin (in woodlouse/centipede) leading to impairment of aerobic capacity. The differences in pesticide effects might be assigned to the differences in chemical nature of pesticides and their interactions with below-ground fauna. Treatment of gamma-BHC and quinalphos reduced the population of Acari, Coleoptera, Collembola, other arthropods as well as total soil fauna. Acari was least affected by gamma-BHC and maximally affected (72%) in response to quinalphos. The effect of gamma-BHC was fairly similar on Coleoptera, Collembola, other arthropod and total soil fauna suggesting almost similar sensitivity to this pesticide. Likewise, quinalphos was similarly effective on Collemobola and other soil arthropods. Application of carbaryl decreased Acari and Coleoptera population but increased Collembola, other arthropods and total faunal populations. However, application of cypermethrin significantly reduced the population of Acari, Coleoptera, Collembola and total soil fauna and increased the population of other soil arthropods. In both the cases, acarine population was least affected. CONCLUSION: The observations show the habitat-specific variation in aerobic capacity of soil fauna. However, pesticide-dependent loss in population might be due to impairment of aerobic capacity of soil inhabiting animals in desert.

Animals↗
PubMed2005

The effect of methanolic extract of Tamarindus indica Linn. on the growth of clinical isolates of Burkholderia pseudomallei.

Burkholderia pseudomallei (Pseudomonas pseudomallei) causes melioidosis, a life-threatening infection common among paddy cultivators in Southeast Asian countries. No plant materials have been investigated for its activity against B. pseudomallei. Therefore, a preliminary study was carried out using disc diffusion and minimum inhibitory concentration (MIC) methods to evaluate the anti-B. pseudomallei activity of five Indian medicinal plants documented to have been used for several ailments in the ancient Indian scriptures. The leaf extracts of Tamarindus indica, Lawsonia inermis, and Hibiscus rosa-sinensis, the rhizome extracts of Curcuma longa and the seeds of Vigna radiata were prepared using methanol as solvent. The disc diffusion and MIC methods were used to assess the anti-B. pseudomallei activity of the plants tested. Only methanol leaf extracts of Tamarindus indica exhibited anti-B. pseudomallei activity starting from disc concentrations of 150 mug by the disc diffusion method. The other plants failed to show any zone of inhibition. MIC assay revealed that the MIC and minimum bactericidal concentration (MBC) for B. pseudomallei were 125 mug/ml. Our preliminary finding showed that methanolic extracts of Tamarindus indica has anti-B. pseudomallei inhibitory potentials under in vitro conditions. Extensive animal studies may be required before investigating the role of Tamarindus indica for treating melioidosis.

Anti-Bacterial Agents↗