Download or read book Characterization and Evaluation of Cowpea Vigna Unguiculata Genotypes Under Ethiopian Conditions and Their Potential as Forage Protein Supplements for Ruminants written by Dammika Koralagama and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Cowpea Vigna Unguiculata L Walp Genotypes for Adaptation to Low Soil phosphorus Conditions and to Rock Phosphate Application written by Sabiou Mahamane and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cowpea (Vigna ungiculata L. Walp) is a major food and fodder legume in poor countries, particularly Sub-Saharan Africa countries. It is generally produced in sandy, acid soils, deficient in phosphorus (P) which severely limits its production. Because processed phosphate fertilizers are expensive and poorly available to farmers, rock phosphate is viewed as a cheap alternative phosphate source. The present study evaluated 696 U.S Core Collection and IITA cowpea accessions for adaptation to low soil P environments and for response to rock phosphate application. Subsequently, organic acid exudation by selected cowpea genotypes as a mechanism for P acquisition from Fe-oxide and Ca bound P was investigated. A low P soil from Nacogdoches pine forest was used to grow plants. There were two P treatments: 0 and 300 mg P/kg of soil as Tahoua (Niger) rock phosphate. At harvest, plant height, shoot and root dry weights were determined and total biomass and shoot-to-root ratios were computed. Shoot P contents of 100 selected accessions were measured. Sixteen accessions reflecting the wide array of responses observed were selected for the organic acid study. Plants were grown in a growth chamber hydroponically with no P and +P nutrient solutions for 3 weeks. Organic acids were collected in a CaCl2-KCl solution. The nature and quantity of the collected organic acids was determined. Cowpea accessions were significantly different in their ability to adapt to Pdeficiency stress and to acquire P from rock phosphate. The parameters most effective in separating the accessions were shoot mass and total biomass. This data will be potentially useful in the selection of cowpea germplasm for (1) adaptation to West African soils of low P fertility, and (2) ability to utilize P from poorly soluble rock phosphate. The predominant organic acid exuded by cowpea roots was a tricarboxylic acid not yet identified. There was surprisingly more exudation of this acid under +P than under -P conditions. Exudation was more highly correlated to roots than to shoots.
Download or read book Evaluation of Cowpea Vigna Unguiculata L Genotypes for Growth Yield and Protein Content for Vegetable Purpose written by S.N. Darshan and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cowpea Genetic Resources written by N. Q. Ng and published by . This book was released on 1990 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: THE GENETIC RESOURCE. ITALIAN CONTRIBUTIONS. THE JOINT COLLABORATIVE PROJECT ON COWPEA GERMPLASM COLLECTION AND EVALUATION. GERMPLASM EXPLORATION AND COLLECTION. CHEMICAL CHARACTERIZATION AND EVALUATION. CYTOLOGY AND HISTOLOGY. BIOTECHNOLOGY.
Download or read book Characterization and Seed Storage Studies of Cowpea Vigna Unguiculata L Walp Genotypes written by B.H Sunitha and published by . This book was released on 2008 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biochemical Evaluation of Seed Storage Proteins of Cowpea Vigna Unguiculata L WA L P Genotypes with CD Copy written by Prachi Gupta and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Cowpea Vigna Unguiculata L Walp Genotypes for Nitrogen Fixation Under the Influence of Rhizobium Mycorrhiza and Phosphorus written by M. A. Mercy and published by . This book was released on 1988 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Developing Screening Tools for Abiotic Stresses Using Cowpea Vigna Unguiculata L Walp as a Model Crop written by Shardendu Kumar Singh and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abiotic stresses cause extensive loss to agriculture production worldwide. Cowpea is an important legume crop grown widely in tropical and subtropical regions where high temperature, ultraviolet-B (UVB) radiation and drought are the common stress factors limiting production. Various vegetative, physiological, biochemical and reproductive plant attributes were assessed under a range of UVB radiation levels in Experiment I and in a combination with two doses of each carbon dioxide concentration [CO2], temperature, and UVB radiation and their interactions in Experiment II by using six cowpea genotypes and sunlit plant growth chambers. The dynamics of photosynthesis and fluorescence processes were assessed in 15 cowpea genotypes under drought condition in Experiment III in pot-grown plants under sunlit conditions. A distinct response pattern was not observed in cowpea in response to UVB radiation from 0 to 15 kJ; however, plants grown under elevated UVB showed reduced photosynthesis resulting in shorter plants and produced smaller flowers and lower seed yield. Increased phenolic compounds appeared to be a defense response to UVB radiation. The growth enhancements observed by doubling of [CO2] were not observed when plants were grown in combination with elevated UVB or temperature which also showed the most detrimental effects on plant growth and seed yield. Results from Experiment I and II revealed that cowpea reproductive traits were highly sensitive to abiotic stresses compared to the vegetative growth and development. A total stress response index (TSRI) technique, derived from all vegetative and reproductive parameters, was used to screen genotypes for their stress tolerance to UVB or combination of stresses. An increase in water use efficiency while maintaining higher rate of photosynthesis was an important drought tolerance mechanism in tolerant cowpea genotypes. Using principal component analysis technique, four groups of the genotypes were identified for their drought tolerance. Evaluating same genotypes across stress conditions revealed that no single genotype has the absolute tolerance characters to all stress conditions. The identified diversity for abiotic stress tolerance among cowpea genotypes and associated traits can be used to develop tolerant genotypes suitable for an agro-ecological niche though traditional breeding or genetic engineering methods.
Download or read book Physico chemical and Cooking Characteristics of Elite Cowpea Vigna Unguiculata L Walp Genotypes written by Deepa Tcrdal and published by . This book was released on 2010 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic Evaluation and Stability Analysis for Yield and Yield Components in Cowpea Vigna Unguiculata L Walp written by HOSPETI H. B and published by . This book was released on 2003 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Characterization of Cowpea Vigna Unguiculata L Walp Genotypes Using Morphological Characters and Chemical Tests with CD Copy written by Swami B. Vivekananda and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Germplasm Evaluation of Botswana Cowpea Vigna Unguiculata L Walp Landraces written by Barbara E. DeMooy and published by . This book was released on 1985 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Compositional Functional and Nutritional Characterization of Ultrafiltration Processed Cowpea Vigna Unguiculata and Navy Bean Phaseolus Vulgaris Protein Fractions written by Jose Candace Jackson and published by . This book was released on 1999 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gemplasm Evaluation for the Development of Dual purpose Cowpea vigna Unguiculata L Wap Genotypes written by Abueng Innocent Moalafi and published by . This book was released on 2010 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cowpea written by Božica Anđelo Nikolić and published by . This book was released on 2018 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cowpea is a versatile crop that is well-adapted to poor conditions. This, combined with its high nutrition value, gives cowpea the potential to mitigate the effects of climate change and save millions of people from hunger and malnutrition. In Cowpea: Research Progress and Management Challenges, the authors discuss how the increased productivity of cowpea can enhance agribusiness opportunities for people in developing countries and lower costs while increasing income under changing climate conditions.Promising cowpea cultivars are under great threat for profitable cultivation due to the attack of factors such as: fungi, bacteria, viruses, nematodes, nutritional deficiency toxicity, water stress and temperature. Thus, this compilation reviews the present status of fungal and bacterial diseases of this important crop.Next, recent developments about the plant are reviewed which show high recalcitrance to in vitro regeneration and genetic transformation, using different genes of interest, since the 1980s. The main focus of the study included a comparison of protocols for sterilization, types of explants used, growth mediums, cultural conditions, rooting, acclimatization and genetic transformation of cowpea.The authors also discuss the biological and pharmacological aspects of cowpea. Some health benefits include toning the spleen, stomach and pancreas, helping induce urination and relieving damp conditions. Cowpea contains the highest concentration of antioxidant compounds. It also has a small amount of iron, sodium, zinc, copper, manganese and selenium.Next, this collection focuses on how cowpea bean protein hydrolysates are obtained, their pharmacological activities and potential toxicity, as well as the potential inclusion of protein hydrolysates or biopeptides into products where they may act like health promoting functional foods/dietary supplements.The authors propose that efforts should focus on the search for increasingly localized, highly effective inoculants adapted for particular cowpea cultivars over a given environmental setting. To demonstrate this, a review is included which will analyzes some of the most pertinent challenges in the search and development of effective cowpea inoculants and suggestions on the way forward.In conclusion, research on the utility of cowpea based diets in domestic ruminants is reviewed, and the translational impacts of these studies for food security and safety and public health has been highlighted.
Download or read book Evaluating the Impacts of Waterlogging Stress on Cowpea Vigna Unguiculata L Growth Traits and Physiological Performance written by Omolayo Joshua Olorunwa and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The progressive increase in the global population and the rapidly changing climate have put unprecedented pressure on crop production. Cowpea is one of the world’s most important leguminous crops, contributing to food security and environmental sustainability. However, cowpea productivity is limited due to waterlogging stress. The main objective of this study was to explore physiological and biochemical mechanisms to understand how cowpea genotypes respond to waterlogging stress. Four studies were conducted in controlled and field conditions to achieve these objectives. Study 1 characterized the waterlogging tolerance of 30 cowpea genotypes in a controlled environment using 24 morphophysiological parameters with waterlogging tolerance coefficients and multivariate analysis methods. 10% of the genotypes exhibited high tolerance to waterlogging stress, and the genotypes UCR 369 and EpicSelect.4 were identified as the most and least waterlogging tolerant, respectively. Study 2 evaluated the key parameters influencing carbon fixation of UCR 369 and EpicSelect.4 at the reproductive stage. The less tolerant EpicSelect.4 experienced high downregulation of stomatal and non-stomatal limiting factors during waterlogging and recovery, resulting in decreased carbon assimilation rates. UCR 369 rapidly developed adventitious roots, maintained biomass, and restored pigments and metabolites to sustain photosynthesis. A two-year field experiment was conducted in study 3 to quantify the effects of waterlogging on the yields, physiology, and biochemistry of cowpeas at different growth stages. The most apparent impact of waterlogging stress occurred at the reproductive stage, followed by the vegetative and maturity growth stages. Studies suggest that diverse cowpea genotypes have distinct physiological and biochemical mechanisms in response to waterlogging stress. In addition, the tolerant genotypes and traits identified herein can be used in genetic engineering and cowpea breeding programs that integrate increased yield with waterlogging stress tolerance.
Download or read book Assessing successive leaf yield performance of dual purpose cowpea Vigna unguiculata to decrease seasonal shortage of nutrients in resource poor small scale households of Tanzania and Uganda written by Severin Polreich and published by Cuvillier Verlag. This book was released on 2011-03-23 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study presents a method to assess yield performance of dual-purpose cowpea types for human consumption and to reveal potentials for further improvement of its use as leafy vegetable. Eleven cowpea accessions with different genetic background and sample status were chosen from AVRDC’s working collection in Arusha, Tanzania. Among them, dual-purpose cowpeas like Dakawa, Ex Iseke and Ngoji were present that the center has been distributing to local farmers. Multi-location trials in typical cowpea production environments were established both on farm and on station in the regions Arusha, Dodoma, and Kilimanjaro in Tanzania and in Eastern Region, Uganda during the short and long rainy season 2007 and 2008, respectively. Young, tender leaves were picked in successive leaf harvests about every and two weeks until the plants did not produce further leaves. Cowpea seeds were harvested when pods reached 80% maturity. Data of yield parameters were analyzed with analysis of variance (ANOVA), stability analyses were carried out according to the dynamic and static concepts. Reliability of leaf and seed yield performances were calculated based on the probability of outperformance of local check cowpeas that were previously recommended by farmers and extension workers in informal group sessions. Through NIRS, crude protein and iron contents were assessed in leaves obtained from the second leaf harvests at the different locations and from up to subsequent leaf harvests. Dual-purpose utility for smallholders was assessed through (i) an index of superiority (Si), in which reliabilities of leaf yield across repeated leaf harvests and seed yield were weighed and combined to overall yield benefit of the ith accession, (ii) effective plot length for nutritional component XY, to calculate the length of a plot (in m) that needs to be planted to sustain a five-head household for ten days with a recommended amount of nutrients, and (iii) responsiveness (Resp), reflecting changes of leaf yield (compensation) relative to changes in seed yield (sensitiveness) if harvesting frequency was intensified. Performance of single leaf yields was strongly influenced by environmental factors and, only in Arusha, accession-specific. Interactions between yield reliability and stability were site-specific. Overall, test-accessions achieved higher reliabilities in seed yield than in leaf yield. Only in the on-station trial in Eastern Region, accession IT82D-889, and in the on-farm trial in Kilimanjaro, ILRI11114 and Ex Iseke showed leaf yield reliabilities above 0.50. Iron content in cowpea leaves was highly dependent on environmental influences and varied from 157.4 mg kg-1 to 286.1 mg kg-1. Leaf CP had a broad-sense heritability of 0.87. Across accessions and environments the mean leaf CP content ranged from 37.4% of DM (IT93K-2045-29) to 33.9% of DM (Sudan). CP and leaf dry matter (DM) yield had significantly negative correlation coefficients between. Means of effective plot length for crude protein and iron varied by more than 50% across environments. Although CP, in contrast to iron, was genetically determined, its impact on differences in effective plot length was negligible as well, as differences in production of leaf DM per m2 were by far larger among accessions than those of CP contents. It was recommended to favor accessions with short effective plot lengths and higher CP contents in leaf yields over those with short effective plot lengths and low CP contents. In contrast to determinate cowpeas, indeterminate types increased their DM gain in aerial plant parts of leaf-harvested plants relatively to unharvested plants. Indeterminate cowpeas responded with high leaf yield increases if leaves were picked twice a week. Consequently yields of total edible DM of these plant types, comprising added seed and leaf yields, increased with intensification of leaf-harvesting frequency from once to twice a week. Determinate plant types yielded highest in total edible DM when only seed was harvested or in less intensive leaf-harvesting scenarios. Accessions with favorable responsiveness, reflecting leaf yield changes relative to seed yield changes under intensified leaf-harvesting frequency, were Sudan, ILRI11114, and IT93K2045-29. In contrast, Resps of SAM45 and ILRI15742 were poorest. Traits have to be identified that could explicitly improve Resp of cowpea types. Improving quantitative yield parameters should not result in quality decrease. The dual-purpose characteristics of local checks were mainly superior to the eleven test-accessions pointing to a demand on improved leaf yield performance that is not merely total leaf yield amount but also the continuance during repeated leaf harvesting. By the proposed method the status quo of a defined location, i.e. site-specific demands on germplasm, can be included in the analysis, serving as benchmark for improvement if the local check is chosen carefully. Since single leaf yields are the results of fairly complex and dynamic interactions between plant physiological processes and environmental conditions it is essential to conduct participatory variety selection and plant breeding trials for dual-purpose assessments in target environments and not ex situ.
