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Book Quantitative Genetics and Selection in Plant Breeding

Download or read book Quantitative Genetics and Selection in Plant Breeding written by Günter Wricke and published by Walter de Gruyter. This book was released on 2010-10-06 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantitative Genetics and Selection in Plant Breeding.

Book Genetic Analysis of Seed Yield and Its Components in Cowpea Vigna Unguiculata L Walp

Download or read book Genetic Analysis of Seed Yield and Its Components in Cowpea Vigna Unguiculata L Walp written by Anupam Singh and published by . This book was released on 2000 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Genetic and Genomic Resources of Grain Legume Improvement

Download or read book Genetic and Genomic Resources of Grain Legume Improvement written by Ousmane Boukar and published by Elsevier Inc. Chapters. This book was released on 2013-07-18 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cowpea (Vigna unguiculata), an indigenous legume to sub-Saharan Africa, is mainly grown in the dry savanna areas as an intercrop with millets, sorghum, groundnut and maize. Cowpea grains rich in protein are consumed in different forms in several parts of the tropics. The average grain yield of cowpea in West Africa is approximately 492kg/ha, which is much lower than its potential yields. This low productivity is due to a host of diseases, insects, pests, parasitic weeds, drought, poor soils and low plant population density in farmers’ fields. Ex situ collection of over 15,000 accessions of cowpea and wild Vigna germplasm from different parts of the world were assembled in the IITA gene bank. These genetic resources have been explored to identify new traits and to develop elite cowpea varieties. Many cowpea varieties with high yield potential have been developed and adopted by the farmers. Efforts are continuing to develop better performing varieties using conventional breeding procedures, while molecular tools are being developed to facilitate progress in cowpea breeding.

Book Germplasm Evaluation for Genetic Variability to Yield and Yield Contributing Characters in Cowpea Vigna Unguiculata L Walp

Download or read book Germplasm Evaluation for Genetic Variability to Yield and Yield Contributing Characters in Cowpea Vigna Unguiculata L Walp written by ONKARAPPA T and published by . This book was released on 1994 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book GGE Biplot Analysis

Download or read book GGE Biplot Analysis written by Weikai Yan and published by CRC Press. This book was released on 2002-08-28 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research data is expensive and precious, yet it is seldom fully utilized due to our ability of comprehension. Graphical display is desirable, if not absolutely necessary, for fully understanding large data sets with complex interconnectedness and interactions. The newly developed GGE biplot methodology is a superior approach to the graphical analys

Book Germplasm Evaluation of Botswana Cowpea Vigna Unguiculata L Walp Landraces

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:

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

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.

Book Molecular Characterization and Variability Studies for Seed Yield and Its Attributing Characters in Cowpea Vigna Unguiculata L Walp

Download or read book Molecular Characterization and Variability Studies for Seed Yield and Its Attributing Characters in Cowpea Vigna Unguiculata L Walp written by P.B Nooh and published by . This book was released on 2007 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Advances in Cowpea Research

Download or read book Advances in Cowpea Research written by B. B. Singh and published by IITA. This book was released on 1997 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cowpea: taxonomy, genetics, and breeding, physiology and agronomy, diseases and parasitic weeds, insect pests, postharvest technology and utilization. Biotechnological applications.