QTLs affecting morph-physiological traits related to drought tolerance detected in overlapping introgression lines of rice (Oryza sativa L.)

文献类型： 外文期刊

第一作者： Zhao, Xiu-Qin

作者： Zhao, Xiu-Qin;Xu, Jian-Long;Zhao, Ming;Zhu, Ling-Hua;Fu, Bin-Ying;Gao, Yong-Ming;Li, Zhi-Kang;Zhao, Xiu-Qin;Xu, Jian-Long;Lafitte, Renee;Fu, Bin-Ying;Gao, Yong-Ming;Li, Zhi-Kang

作者机构：

关键词： rice;drought tolerance;photosynthesis;QTLs

期刊名称：PLANT SCIENCE （ 影响因子：4.729； 五年影响因子：5.132 ）

ISSN： 0168-9452

年卷期： 2008 年 174 卷 6 期

页码：

收录情况： SCI

摘要： Plant photosynthetic traits such as net photosynthetic rate (P-n), stomata conductance (g(s)), transpiration rate (T-r), and intercellular CO2 concentration (C-i), are known to relate to drought tolerance in plants, but the genetic basis of these traits remains largely uncharacterized because of the difficulty in phenotyping physiological traits in a large mapping population. In this study, a set of 55 overlapping introgression lines (ILs) in the Teqing (indica) background were used to genetically dissect several morph-physiological traits and their relationship with grain yield under water stress and non-stress conditions. These traits included specific leaf weight (SLW), chlorophyll content (CC), leaf stomata frequency (SF), P-n, g(s), T-r, and C-i. A total of 40 QTLs affecting the measured traits were identified and mapped to 21 genomic regions in the rice genome. Clustered QTLs affecting P-n, g(s), T-r, and C-i in the same genomic regions suggest common genetic bases for the physiological traits. Low or no phenotypic correlations between leaf morphological traits and photosynthetic traits and between morph-physiological traits and grain yield (GY) appeared to be due to inconsistence in QTL effect for clustered QTLs, unlinked QTLs affecting different traits, and to possible epistasis that could not be adequately addressed in this study. Our results indicate that improving drought tolerant (DT) of rice by selecting any single secondary traits is not expected to be effective and the identified QTLs for GY and related morph-physiological traits should be carefully confirmed before to be used for improving DT in rice by MAS. (C) 2008 Published by Elsevier Ireland Ltd.

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