title: Genotypic diversity and environmental stability of starch physicochemical properties in the USDA rice mini-core collection.
abstract: The USDA rice mini-core collection consists of 217 accessions representative of a world-wide germplam bank. We investigated its genotypic diversity in starch physicochemical properties and the effects of genotype, environment and G×E interaction in this study. High genotypic diversity was found in all 18 measured starch quality traits in the mini-core rice in two location-years in China. Genotype, environment and G×E effects on these traits were analysed using 115 common accessions successfully produced in both environments. Thermal properties (To, Tpand Tc) were very stable whereas most other traits differed significantly between environments. However, when these accessions were divided into five subgroups based on amylose content, environment was found to have differential effects. G×E interaction also played a significant role in determining the starch traits. These findings will provide guidance for selection from the diverse genotypes in the USDA mini-core collection for cultivation and for developing cultivars with desired cooking and eating quality.
authors.affiliation: School of Biological Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China.
authors.forename: Kehu
authors.initials: K
authors.lastname: Li
authors.affiliation: Institute of Nuclear Agricultural Sciences, College of Agriculture and Biotechnology, Zhejiang University, Hua Jiachi Campus, Hangzhou 310029, China.
authors.forename: Jinsong
authors.initials: J
authors.lastname: Bao
authors.affiliation: School of Biological Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China; Department of Food Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. Electronic address: hcorke@yahoo.com.
authors.forename: Harold
authors.initials: H
authors.lastname: Corke
authors.affiliation: School of Biological Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China. Electronic address: meisun@hku.hk.
authors.forename: Mei
authors.initials: M
authors.lastname: Sun
mesh_terms: D000688:Amylose / Q000032:analysis; D055598:Chemical Phenomena; D004777:Environment; D005838:Genotype; D012275:Oryza / Q000737:chemistry* / Q000235:genetics; D013213:Starch / Q000737:chemistry*; D014481:United States; D016885:United States Department of Agriculture
chemical_list: D013213:Starch; D000688:Amylose
keywords: Apparent amylose content; Environmental effects; Genotypic diversity; Physicochemical properties; Rice starch; USDA rice mini-core collection