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Vigna

About: Vigna is a(n) research topic. Over the lifetime, 5620 publication(s) have been published within this topic receiving 62948 citation(s).
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Journal ArticleDOI
TL;DR: Development of cultivars with multiple resistances to biotic and abiotic stresses is an important current breeding objective and Earliness, delayed leaf senescence, and indeterminate growth habit are characteristics which are being combined to improve drought adaptation.
Abstract: Cowpea (Vigna unguiculata L. Walp.) is a widely adapted, stress tolerant grain legume, vegetable, and fodder crop grown on about 7 million ha in warm to hot regions of Africa, Asia, and the Americas. This review focuses on major breeding achievements, current objectives, and future opportunities for cowpea improvement. Early maturing cultivars have been developed with regionally acceptable grain quality and resistance to some important diseases and pests including bacterial blight (Xanthomonas campestris), cowpea aphid-borne mosaic virus (CABMV), cowpea aphid (Aphis craccivora), cowpea curculio (Chalcodermus aeneus), root-knot nematodes (Meloidogyne incognita and M. javanica), cowpea weevil (Callosobruchus maculatus) and the parasitic weeds Striga gesnerioides and Alectra vogelii. earliness is important in Africa and other regions because early cultivars can escape drought and some insect infestations, can provide the first food and marketable product available from the current growing season, and can be grown in a diverse array of cropping systems. New early maturing cultivars with indeterminate growth habits have been very effective in the extremely dry and hot environment of the Sahel. Heat tolerant breeding lines have been developed which have markedly higher pod set than most cultivars under high night temperature conditions. Development of cultivars with multiple resistances to biotic and abiotic stresses is an important current breeding objective. Earliness, delayed leaf senescence, and indeterminate growth habit are characteristics which are being combined to improve drought adaptation. In the future, high levels of resistance to very important insect pests such as flower thrips (Megalurothrips sjostedti), maruca pod borer (Maruca testulalis), lygus (Lygus hesperus), and pod bugs (Clavigralla tomentosicollis and others) need to identified. Genes from wild cowpeas or related Vigna species or genetic engineering may be necessary to develop cultivars with high levels of resistance to several of the major insect pests.

594 citations


Journal ArticleDOI
01 Dec 1990-Plant and Soil
TL;DR: The (lignin + polyphenol):N ratio appears to be a good predictor of N mineralization rates of incorporated legumes, but the method for analyzing plant poly phenol needs to be standardized.
Abstract: A 12-week greenhouse experiment was conducted to determine the effect of the polyphenol, lignin and N contents of six legumes on their N mineralization rate in soil and to compare estimates of legume-N release by the difference and 15N-recovery methods Mature tops of alfalfa (Medicago sativa L), round leaf cassia (Cassia rotundifolia Pers, var Wynn), leucaena (Leucaena leucocephala Lam, deWit), Fitzroy stylo (Stylosanthes scabra Vog, var Fitzroy), snail medic (Medicago scutellata L), and vigna (Vigna trilobata L, var verde) were incorporated in soil at the rate of 100 mg legume N kg-1 soil The medic and vigna were labeled with 15N Sorghum-sudan hybrid (Sorghum bicolor, L Moench) was used as the test crop A non-amended treatment was used as a control Net N mineralization after 12 weeks ranged from 11% of added N with cassia to 47% of added N for alfalfa With the two legumes that contained less than 20 g kg-1 of N, stylo and cassia, there was net N immobilization for the first 6 weeks of the experiment The legume (lignin + polyphenol):N ratio was significantly correlated with N mineralization at all sampling dates at the 005 level and at the 001 level at 6 weeks (r2=0866) Legume N, lignin, or polyphenol concentrations or the lignin:N ratio were not significantly correlated with N mineralization at any time The polyphenol:N ratio was only significantly correlated with N mineralization after 9 weeks (r2=0692) The (lignin + polyphenol):N ratio appears to be a good predictor of N mineralization rates of incorporated legumes, but the method for analyzing plant polyphenol needs to be standardized Estimates of legume-N mineralization by the difference and 15N recovery methods were significantly different at all sampling dates for both 15N-labeled legumes After 12 weeks, estimates of legume-N mineralization averaged 20% more with the difference method than with the 15N recovery method This finding suggests that estimates of legume N available to subsequent crops should not be based solely on results from 15N recovery experiments

373 citations


Journal ArticleDOI
TL;DR: Test the hypothesis that the bacterial strains possessing 1‐aminocyclopropane‐1‐carboxylic acid (ACC)‐deaminase activity may also promote growth of inoculated plants and could increase nodulation in legumes upon co‐inoculation with rhizobia.
Abstract: Aims: This study was conducted to test the hypothesis that the bacterial strains possessing 1-aminocyclopropane-1-carboxylic acid (ACC)-deaminase activity may also promote growth of inoculated plants and could increase nodulation in legumes upon co-inoculation with rhizobia. Methods and Results: Several rhizobacteria were isolated from maize rhizosphere through enrichment on ACC as a sole N source. Purified isolates were screened for growth promotion in maize under axenic conditions and for in vitro ACC-deaminase activity. A significant positive correlation was observed between in vitro ACC-deaminase activity of bacterial cells and root elongation. None of the isolates produced auxins. Bradyrhizobiumjaponicum produced less amount of auxins but did not carry ACC-deaminase activity. Results of pot experiment revealed that co-inoculation with Bradyrhizobium and plant growth promoting rhizobacteria (PGPR) isolates enhanced the nodulation in mung bean compared with inoculation with Bradyrhizobium alone. Conclusions: It is highly expected that inoculation with rhizobacteria containing ACC-deaminase hydrolysed endogenous ACC into ammonia and α-ketobutyrate instead of ethylene. Consequently, root and shoot growth as well as nodulation were promoted. Significance and Impact of the Study: The ACC-deaminase trait could be employed as an efficient tool to screen effective PGPR, which could be successfully used as biofertilizers to increase the growth of inoculated plants as well as nodulation in legumes.

300 citations


Journal ArticleDOI
TL;DR: A draft genome sequence of mungbean is constructed to facilitate genome research into the subgenus Ceratotropis, which includes several important dietary legumes in Asia, and to enable a better understanding of the evolution of leguminous species.
Abstract: Mungbean (Vigna radiata) is a fast-growing, warm-season legume crop that is primarily cultivated in developing countries of Asia. Here we construct a draft genome sequence of mungbean to facilitate genome research into the subgenus Ceratotropis, which includes several important dietary legumes in Asia, and to enable a better understanding of the evolution of leguminous species. Based on the de novo assembly of additional wild mungbean species, the divergence of what was eventually domesticated and the sampled wild mungbean species appears to have predated domestication. Moreover, the de novo assembly of a tetraploid Vigna species (V. reflexo-pilosa var. glabra) provides genomic evidence of a recent allopolyploid event. The species tree is constructed using de novo RNA-seq assemblies of 22 accessions of 18 Vigna species and protein sets of Glycine max. The present assembly of V. radiata var. radiata will facilitate genome research and accelerate molecular breeding of the subgenus Ceratotropis.

278 citations


Journal ArticleDOI
TL;DR: It is concluded that the elevated level of proline in association with antioxidant system, at least in part, was responsible for the amelioration of Al stress in mung bean seedlings.
Abstract: Brassinosteroids (BRs) elicit diverse physiological responses and ameliorate various biotic and abiotic stresses. With an aim to further explore and elaborate their role in plants subjected to abiotic stress, more specifically the heavy metal stress, the seedlings of mung bean were grown in a plant growth chamber under controlled conditions, on a sandy substratum. The seedlings were subjected to aluminium (0.0, 1.0 or 10.0 mM) stress, at 1-week-old stage and were sprayed with 0 or 10−8 M of 24-epibrassinolide (EBL) or 28-homobrassinolide (HBL) at 14-day stage. The analysis of the plants at the completion of 3 weeks of growth revealed that the presence of aluminium in the nutrient medium caused a sharp reduction in growth (length, fresh and dry mass of root and shoot), the activity of carbonic anhydrase (E.C. 4.2.1.1), relative water content, water use efficiency, chlorophyll content and the rate of photosynthesis. However, the activity of antioxidative enzymes [catalase (E.C. 1.11.1.6), peroxidase (E.C. 1.11.1.7) and superoxide dismutase (E.C. 1.15.1.1)] in leaves and the content of proline, both in leaves and roots increased in the aluminium-stressed plants. The spray of EBL or HBL, in absence of aluminium strongly favoured the above parameters and also improved them, in the plants grown under aluminium stress. Moreover, it is also noteworthy that EBL and HBL caused a further stimulation of antioxidative enzymes and proline content, which were already enhanced by aluminium stress. This led us to the conclusion that the elevated level of proline in association with antioxidant system, at least in part, was responsible for the amelioration of Al stress in mung bean seedlings.

250 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20221
2021210
2020346
2019271
2018321
2017357

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Topic's top 5 most impactful authors

Norihiko Tomooka

34 papers, 1.2K citations

Prakit Somta

30 papers, 829 citations

Akito Kaga

21 papers, 718 citations

Peerasak Srinives

19 papers, 645 citations

Duncan A. Vaughan

18 papers, 836 citations