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Identification and Validation of Aerobic Adaptation QTLs in Upland Rice

生物 渗入 适应(眼睛) 数量性状位点 农学 人口 旱稻 栽培 水稻 基因 遗传学 社会学 人口学 神经科学
作者
Peng Xu,Jun Yang,Zhenbing Ma,Diqiu Yu,Jiawu Zhou,Dayun Tao,Zichao Li
出处
期刊:Life [MDPI AG]
卷期号:10 (5): 65-65 被引量:11
标识
DOI:10.3390/life10050065
摘要

The aerobic adaptation of upland rice is considered as the key genetic difference between upland rice and lowland rice. Genetic dissection of the aerobic adaptation is important as the basis for improving drought tolerance and terrestrial adaptation by using the upland rice. We raised BC1-BC3 introgression lines (ILs) in lowland rice Minghui 63 (MH63) background. The QTLs of yield and yield-related traits were detected based on ILs under the aerobic and lowland environments, and then the yield-related QTLs were identified in a backcrossed inbred population of BC4F5 under aerobic condition. We further verified phenotypes of QTL near-isogenic lines. Finally, three QTLs responsible for increasing yield in aerobic environment were detected by multiple locations and generations, which were designated as qAER1, qAER3, andqAER9 (QTL of aerobic adaptation). The qAER1 and qAER9 were fine-mapped. We found that qAER1 and qAER9 controlled plant height and heading date, respectively; while both of them increased yields simultaneously by suitable plant height and heading date without delay in the aerobic environment. The phenotypic differences between lowland rice and upland rice in the aerobic environment further supported the above results. We pyramided the two QTLs as corresponding molecular modules in the irrigated lowland rice MH63 background, and successfully developed a new upland rice variety named as Zhongkexilu 2. This study will lay the foundation for using aerobic adaptation QTLs in rice breeding programs and for further cloning the key genes involved in aerobic adaptation.
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