Genetic dissection of root morphological traits as related to potassium use efficiency in rapeseed under two contrasting potassium levels by hydroponics

文献类型： 外文期刊

第一作者： Dun, Xiaoling

作者： Dun, Xiaoling;Shi, Jiaqin;Liu, Huiping;Wang, Jie;Wang, Xinfa;Wang, Hanzhong

作者机构：

关键词： Brassica napus L; root traits; potassium efficiency; QTL mapping; QTL cluster

期刊名称：SCIENCE CHINA-LIFE SCIENCES （ 影响因子：6.038； 五年影响因子：4.754 ）

ISSN： 1674-7305

年卷期： 2019 年 62 卷 6 期

页码：

收录情况： SCI

摘要： To reveal the genetic basis of potassium use efficiency (KUE) in rapeseed, root morphology (RM), biomass and KUE-related traits were measured in a recombinant inbred line population with 175 F-7 lines that were subjected to high-potassium (HK) and low-potassium (LK) treatments by hydroponics. A total of 109 significant QTLs were identified to be associated with the examined traits. Sixty-one of these QTLs were integrated into nine stable QTLs. The higher heritability for RM and biomass traits and lower heritability for KUE-related traits, as well as nine stable QTLs for RM traits and only two for KUE-related traits, suggested that regulating RM traits would be more effective than selecting KUE traits directly to improve KUE by marker-assisted selection. Furthermore, the integration of stable QTLs identified in the HK, LK, high-nitrogen (HN) and low-nitrogen (LN) conditions gave 10 QTL clusters. Seven of these clusters were classified into major QTLs that explained 7.4%-23.7% of the total phenotypic variation. Five of the major QTL clusters were detected under all of the treated conditions, and four clusters were specifically detected under the LK and LN conditions. These common and specific QTL clusters may be useful for the simultaneous improvement of multiple traits by marker-assisted selection.

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