QTL mapping of grain quality traits in rice
QTL mapping of grain quality traits in rice
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DOI：
10.1016/j.jcs.2009.04.005
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发表时间：
2009-09-01
影响因子：
3.8
通讯作者：
Luo, Lijun
中科院分区：
文献类型：
--
作者：
Lou, Jue;Chen, Liang;Luo, Lijun
提高谷物品质是水稻育种计划中最重要的目标之一。将小粒级籼稻品种与大粒级粳稻品种杂交，构建一组重组自交系（RIL），用于鉴定控制八个籽粒品质性状的数量性状位点（QTL）。基于185个SSR标记的连锁图谱，总共16个QTL被定位在6条染色体上。 3号染色体上RM3204和RM16侧翼的多效性主效应QTL（M-QTL）影响粒长（GL）、长宽比（LWR）和整精米比（HRR），分别解释了46.0%、36.1%和29.7%的表型变异。除MRR外的所有性状共鉴定出18个上位QTL，分布在除10号染色体外的所有染色体上。上位QTL涉及2个GL的M-QTL和1个GW的M-QTL。没有检测到M-QTL或上位QTL与环境之间存在显着的相互作用，除了AC通过环境相互作用具有显着的M-QTL且影响较小。 GL和LWR与HRR呈显着负相关，这可能导致在水稻育种实践中难以培育出具有较高HRR的长粒。 (C) 2009 Elsevier Ltd. 保留所有权利。
Grain quality improvement is one of the most important goals in a rice breeding program. An indica variety with small grain size was crossed to a japonica variety with large grain size to construct a set of recombinant inbred lines (RILs) which was used to identify quantitative trait loci (QTLs) controlling eight grain quality traits. Based on a linkage map of 185 SSR markers, a total of 16 QTLs were mapped on six chromosomes. A pleiotropic main effect QTL (M-QTL) flanked by RM3204 and RM16 on chromosome 3 influences the grain length (GL), length width ratio (LWR) and head rice ratio (HRR), explaining the phenotypic variation of 46.0, 36.1 and 29.7%, respectively. A total of 18 epistatic QTLs were identified for all the traits except MRR, distributed on all the chromosomes except chromosome 10. Two M-QTLs for GL and one M-QTL for GW were involved in epistatic QTL. No significant interaction between M-QTL or epistatic QTL and environment was detected except AC having significant M-QTL by environment interaction with minor effect. GL and LWR have a significant negative relation with HRR which might make it difficult to develop long grain with higher HRR in the rice breeding practice. (C) 2009 Elsevier Ltd. All rights reserved.