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Genetic diversity of physical, nutritional and functional properties of cowpea grain and relationships among the traits

Published online by Cambridge University Press:  12 March 2015

Satoru Muranaka*
Affiliation:
Japan International Research Center for Agricultural Sciences, 1-1, Ohwashi, Tsukuba, Ibaraki, Japan
Mariko Shono
Affiliation:
Japan International Research Center for Agricultural Sciences, 1-1, Ohwashi, Tsukuba, Ibaraki, Japan
Takao Myoda
Affiliation:
Tokyo University of Agriculture, 195, Yasaka, Abashiri, Hokkaido, Japan
Junko Takeuchi
Affiliation:
Hokkaido Okhotsk Food Technology Center, 19-353, Taisho, Kitami, Hokkaido, Japan
Jorge Franco
Affiliation:
Facultad de Agronomía, Universidad de la República, Ruta 3, Km. 363, Paysandú, Uruguay
Yozo Nakazawa
Affiliation:
Tokyo University of Agriculture, 195, Yasaka, Abashiri, Hokkaido, Japan
Ousmane Boukar
Affiliation:
International Institute of Tropical Agriculture, PMB 5320, Oyo Road, Ibadan200001, Oyo State, Nigeria
Hiroko Takagi
Affiliation:
Japan International Research Center for Agricultural Sciences, 1-1, Ohwashi, Tsukuba, Ibaraki, Japan
*
*Corresponding author. E-mail: smuranaka@affrc.go.jp

Abstract

Cowpea is traditionally important as an affordable source of protein and minerals and of cash income in sub-Saharan Africa, especially for small-scale farmers who have limited options for food and cash crops. The development and deployment of cowpea varieties with improved nutrition and quality that meet the needs of farmers and consumers should enhance cowpea consumption and production in the region. We have identified genetic diversity in various grain quality-related traits of cowpea and relationships among the traits. Wide genetic variation and strong correlations among crude protein, Fe and Zn contents suggest the possibility of improving the concentrations of these nutritional factors simultaneously. Low associations among physical and nutritional properties of grain indicate the possibility of introgressing favorable traits utilizing identified genetic resources. However, narrow variation in amino acid (AA) composition suggests a lesser possibility of improving the contents of specific AAs in cowpea, but it gave a reliable nitrogen-to-protein conversion factor of 5.45 for the estimation of crude protein content. Several improved breeding lines were identified with low concentrations of flatulence-causing oligosaccharides and various favorable agronomic traits and nutrient contents. TVu-12802 had the highest contents of crude protein and high contents of micronutrients, with a low ratio of phytic acid to Fe and Zn contents.

Type
Research Article
Copyright
Copyright © NIAB 2015 

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