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Identification of QTLs associated with the anaerobic germination potential using a set of Oryza nivara introgression lines

文献类型： 外文期刊

作者： Liu, Licheng 1 ; Li, Xiaoxiang 2 ; Liu, Sanxiong 2 ; Min, Jun 2 ; Liu, Wenqiang 2 ; Pan, Xiaowu 2 ; Fang, Baohua 2 ; Hu, 1 ;

作者机构： 1.Hunan Agr Univ, Coll Agr, Changsha 410128, Peoples R China

2.Hunan Acad Agr Sci, Hunan Rice Res Inst, Changsha 410125, Peoples R China

3.MOA Key Lab Indica Rice Genet & Breeding Middle &, Changsha 410125, Peoples R China

关键词： Oryza nivara; Introgression line; Anaerobic germination tolerance; QTL

期刊名称：GENES & GENOMICS （ 影响因子：1.839； 五年影响因子：1.329 ）

ISSN： 1976-9571

年卷期： 2021 年 43 卷 4 期

页码：

收录情况： SCI

摘要： Background Rice (Oryza sativa L.) is an important crop and a staple food for half of the population around the world. The recent water and labor shortages are encouraging farmers to shift from traditional transplanting to direct-seeding. However, poor germination and slow elongation of the coleoptile constrains large-scale application of direct-seeding. Objective This study was aimed to investigate the genetic basis of the anaerobic germination (AG) potential using a set of Oryza nivara (O. nivara) introgression lines (ILs). Methods In this study, a total of 131 ILs were developed by introducing O. nivara chromosome segments into the elite indica rice variety 93-11 through advanced backcrossing and repeated selfing. A high-density genetic map has been previously constructed with 1,070 bin-markers. The seeds of ILs were germinated and used to measure coleoptile length under normal and anaerobic conditions. QTLs associated with AG potential were determined in rice. Results Based on the high-density genetic map of the IL population, two QTLs, qAGP1 and qAGP3 associated with AG tolerance were characterized and located on chromosomes 1 and 3, respectively. Each QTL explained 15% of the phenotypic variance. Specifically, the O. nivara-derived chromosome segments of the two QTLs were positively tolerance to anaerobic condition by increasing coleoptile length. In a further analysis of public transcriptome data, a total of 26 and 36 genes within qAGP1 and qAGP3 were transcriptionally induced by anaerobic stress, respectively. Conclusions Utilization of O. nivara-derived alleles at qAGP1 and qAGP3 can potentially enhance tolerance to anaerobic stress at the germination stage in rice, thereby accelerating breeding of rice varieties to be more adaptative for direct-seeding.

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