Research Article

Quantitative Trait Locus Analysis for Grain Size Related Traits of Rice  

Zeng Wei1* , Cai Zhongquan3* , Wang Yongliang1 , Jiang Qigui 1 , Wang Jun1 , Li Shurong1 , Peng  Lu1 , Qin Baoxiang1,3 , Chen Baoshan1,2 , Li Rongbai1,3 , Luo Jijing1,2
1 College of Life Science and Technology, Guangxi University, Nanning, 530004, China
2 State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi University, Nanning, 530004, China
3 Agriculture College, Guangxi University, Nanning, 530004, China
* These authors have contributed equally to this work
Author    Correspondence author
Molecular Plant Breeding, 2016, Vol. 7, No. 12   doi: 10.5376/mpb.2016.07.0012
Received: 15 Mar., 2016    Accepted: 30 Apr., 2016    Published: 06 Apr., 2016
© 2016 BioPublisher Publishing Platform
This is an open access article published under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Preferred citation for this article:

Zeng W., Cai Z.Q., Wang Y.L., Jiang Q.G., Wang J., Li S.R., Peng L., Qin B.X., Chen B.S., Li R.B., and Luo J.J., 2016, Quantitative Trait Locus Analysis for Grain Size Related Traits of Rice, Molecular Plant Breeding, 7(12): 1-19 (doi: 10.5376/mpb.2016.07.0012)

Abstract

Grain shape and size, which are characterized by grain length, grain width, grain thickness, and length to width ratio, are the key determinants of grain weight. In this study, a 188-individual F2 population, which derived from a cross between large grain Indica cultivar Nangyangzhan and medium grain Indica cultivar Ce253, were used to analyze grain size related QTLs with 110 molecular markers. Inclusive Composite Interval Mapping (ICIM), was applied to genome-wide detection of QTLs underlying grain size related traits. For grain length, 4 QTLs were detected on chromosome 1, 3, 4, and 9, respectively. qGL-3, a major effect QTL, explained 27.60% phenotypic variation of grain length. Four QTLs for grain width were detected on chromosome 2, 3, and 5. Among them, qGW-5a was major QTL for grain width, which explained 21.30% of phenotypic variation. Five QTLs for length to width ratio, which were distributed on chromosome 2, 3, 5, and 12, were identified. The range of their phenotypic contribution varied from 8.60% to 16.86%. For TGW QTLs, only two were identified on chromosome 5 and 6, respectively, with which 13.26% and 9.04% phenotypic contribution. In our results, qGL-4 and qGL-9 for grain length were novel loci. They have not seen reported in literature previously. Our results shed new light on further fine mapping and understanding the molecular genetic mechanism of novel grain size QTLs.

Keywords
Digenic epistasis; Genetic linkage map; Grain size traits; QTL; Rice (Oryza sativa)
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