Mapping and validation of a major quantitative trait locus qRN5a associated with increasing root number under low potassium in rice

文献类型： 外文期刊

第一作者： Islam, Anowerul

作者： Islam, Anowerul;Zhang, Yingxin;Anis, Galal;Rani, M. H.;Anley, Workie;Shen, Xihong;Cao, Liyong;Cheng, Shihua;Wu, Weixun;Islam, Anowerul;Anis, Galal;Rani, M. H.

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关键词： Rice; Chromosome segment substitution lines; Quantitative trait loci; Root number; Low potassium; Hydroponic culture

期刊名称：PLANT GROWTH REGULATION （ 影响因子：3.412； 五年影响因子：3.691 ）

ISSN： 0167-6903

年卷期： 2020 年 90 卷 3 期

页码：

收录情况： SCI

摘要： Potassium (K) is an indispensable mineral constituent required for plant growth and many physiological processes. K deficiency and depletion in rice occurs frequently, resulting in limited growth, agronomical loss, and reduced yield. To investigate the genetics of low K (LK) tolerance, a set of high throughput genotyped chromosome segment substitution lines (CSSL) derived from the cross between Zhonghui9308 (ZH9308, susceptible to LK) and XieqingzaoB (tolerant to LK) was used to identify QTL for the shoot and root traits at the seedling stage. The experiment was conducted in hydroponic culture to explore the molecular basis of five seedling traits under two K conditions, LK and normal K (NK) and their ratio (LK/NK) for relative traits. A total of five QTL were identified on four chromosomes (3, 4, 5, and 6) with positive allelic effects from XieqingzaoB for root length (RL) and root number (RN) and negative allelic effects for shoot dry weight (SDW) and root dry weight (RDW). Two QTLs, qRN5a and qSDW4, were detected under LK and three QTLs, qRL6, qRN5b, and qRDW3, were identified under LK/NK ratio explaining 11.81% to 13.07% of total phenotypic variation. qRN5a, a novel QTL under LK, was validated in the F-2 (BC5F2) population and delimited to a 1023 Kb interval between the markers InD78 to RM18472. These findings will serve as important breeding material for further genetic characterization like fine mapping and cloning, which may be useful in molecular marker-assisted breeding.

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