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Genetic Effects of Wx Allele Combinations on Apparent Amylose Content in Tropical Hybrid Rice

文献类型： 外文期刊

作者： Wang, Kai 2 ; Zhou, Qunfeng 1 ; Liu, Junyu 1 ; Qiu, Fulin 2 ; Dela Paz, Madonna Angelita 2 ; Larazo, Wenceslao 2 ; Yan 1 ;

作者机构： 1.Yuan Longping High Tech Agr Co, Changsha 410000, Hunan, Peoples R China

2.Int Rice Res Inst, DAPO Box 7777, Manila 1301, Philippines

3.China Natl Rice Res Inst, Hangzhou 310006, Zhejiang, Peoples R China

4.Hunan Hybrid Rice Res Ctr, State Key Lab Hybrid Rice, Changsha 410125, Hunan, Peoples R China

5.Liaoning Rice Res Inst, Shenyang 110101, Liaoning, Peoples R China

期刊名称：CEREAL CHEMISTRY （ 影响因子：1.984； 五年影响因子：2.043 ）

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收录情况： SCI

摘要： Apparent amylose content (AAC), as one of the most important quality traits of rice grain, is primarily controlled by the Wx gene, which encodes a granule-bound starch synthase. Effects of putative alleles of Wx of tropical rice hybrids generated from parents with three different nonglutinous Wx alleles (Wx(a), Wx(b), and Wx(in)) were examined in a multienvironment trial. Genotypes of Wx(b)/Wx(in) and Wx(in)/Wx(in) were associated with intermediate AAC (20.2-23.7%), and genotype of Wx(a)/Wx(a) was associated with high AAC (24.9-28.0%). Wx alleles of Wx(in)/Wx(in) could be the most favorable combinations in selecting hybrid parents with desirable intermediate amylose content (20-25%) for rice consumers of South and Southeast Asian countries. Genotype and genotype x environment interaction were the major contributing factors to the variation in parental accessions' and hybrids' AAC, and in terms of AAC, hybrids were more sensitive than parental varieties to environment. Genotypes of Wx(a)/Wx(a), Wx(a)/Wx(in), and Wx(in)/Wx(in) showed higher AAC performance in the wet season than in the dry season.

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