Abstract
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.
Highlights
Rice is one of the most vital food crops in the world, and is considered a model plant for genomics and genetics of cereals [1,2]
The parents, Zhenshan 97 (ZS97) and Xizang 2 (XZ2) had no significant differences in grain length (GL), grain width (GW), grain thickness (GT) and grain weight (Table 1)
GL was in the range of 6.91-9.61 mm with a mean of 8.21 mm in the recombinant inbred line (RIL) for 2011, which was similar to values for the two parents of 8.29 mm for ZS97 and 8.12 mm for XZ2
Summary
Rice is one of the most vital food crops in the world, and is considered a model plant for genomics and genetics of cereals [1,2]. Asia cultivates 90% of all rice and contains 60% of the world population. Rice grain shape (grain size) is determined by its three dimensions including grain length (GL), grain width (GW) and grain thickness (GT). GL and GW in rice have high heritability. GT is largely determined by grain filling that it is affected by environmental factors such as temperature after pollination. Rice grain shape is frequently associated with 1000-grain weight (KW), one component of grain yield [4]. Grain shape is an important appearance quality trait and affects cooking quality [5,6]
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