Journal of Plant Biochemistry & Physiology
Open Access

Abstract

Scanning QTLs for Grain Shape Using a Whole Genome SNP Array in Rice

Wei Hu, Mi Wen, Zhongmin Han, Cong Tan and Yongzhong Xing

Grain shape is an important appearance quality trait that is associated with grain weight in rice. Dissection of the
genetic basis of grain shape will benefit the improvement of grain shape. In this study, we constructed a high-density
genetic linkage map via genotyping a recombinant inbred line population by a single nucleotide polymorphism (SNP)
array. A total of 22 quantitative trait loci (QTLs) were detected, one half was detected in both years of the experiment,
and the other half only in one year. As well as the QTLs reported in previous studies, five novel QTLs were identified,
which could be targets for marker-aided selection for grain shape improvement. Six pleiotropic QTLs were identified
and well explained the correlations among traits. Complementary action of additive QTLs adequately accounted for
the genetic basis of transgressive segregation. One to six heterogeneous inbred families for all detected QTLs were
searched in the recombinant inbred population, which provided a good chance to quickly produce near isogenic
lines. These new QTLs could be quickly validated and fine mapped on the basis of these HIFs.

Published Date: 2013-03-31; Received Date: 2013-01-26