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Detection of Quantitative Trait Loci Associated with Alkaline Tolerance Using Recombinant Inbred Line Population Derived from Longdao5 x Zhongyouzao8 at Seedling Stage

文献类型： 外文期刊

作者： Zhang, Xijuan 1 ; Liu, Kai 2 ; Yang, Chuanming 1 ; Hou, Benfu 1 ; Yang, Xianli 1 ; Wang, Lizhi 1 ; Cui, Shize 1 ; Lai, Yongcai 2 ; Li, Zhugang 1 ; Jiang, Shukun 2 ;

作者机构： 1.Heilongjiang Acad Agr Sci, Crop Cultivat & Tillage Inst, Harbin 150086, Peoples R China

2.Natl Salt Alkali Tolerant Rice Technol Innovat Ctr, Northeast Branch, Harbin 150086, Peoples R China

3.Heilongjiang Prov Key Lab Crop Physiol & Ecol Cold, Harbin 150086, Peoples R China

4.Heilongjiang Prov Engn Technol Res Ctr Crop Cold D, Harbin 150086, Peoples R China

5.Heilongjiang Acad Agr Sci, Qiqihar Branch, Qiqihar 161006, Peoples R China

关键词： japonica rice; alkali tolerant; seedling stage; Northeast China; QTL

期刊名称：LIFE-BASEL （ 影响因子：3.4； 五年影响因子：3.4 ）

ISSN：

年卷期： 2024 年 14 卷 9 期

页码：

收录情况： SCI

摘要： Salt-alkaline stress is one of the most stressful occurrences, causing negative effects on plant development and agricultural yield. Identifying and utilizing genes that affect alkaline tolerance is an excellent approach to accelerate breeding processes and meet the needs for remediating saline-alkaline soil. Here, we employed a mapping population of 176 recombinant inbred lines (RILs) produced from a cross between alkali-tolerant Longdao5 and alkali-sensitive Zhongyouzao8 to identify the quantitative trait loci (QTLs) determining alkali tolerance at the seedling stage. For the evaluation of alkali tolerance, the recovered seedling's average alkali tolerance index (ATI), root number (RN), root length (RL), seedling dry weight (SW), root dry weight (RW), and seedling height (SH) were assessed, together with their relative alkaline damage rate. Under alkaline stress, the ATI was substantially negative connected with the root number, seedling height, seedling dry weight, and root dry weight; however, it was considerably positive correlated with the relative alkaline damage rate of the root number and root dry weight. A total of 13 QTLs for the root number, root length, seedling height, seedling dry weight, root dry weight, and alkali tolerance index under alkaline stress were identified, which were distributed across chromosomes 1, 2, 3, 4, 5, 7, and 8. All of these QTLs formed two QTL clusters for alkali tolerance on chromosome 5 and chromosome 7, designated AT5 and AT7, respectively. Nine QTLs were identified for the relative alkaline damage rate of the root number, root length, seedling height, seedling dry weight, and root dry weight under alkali stress. These QTLs were located on chromosome 2, 4, 6, 7, 8, 9, and 12. In conclusion, these findings further strengthen our knowledge about rice's genetic mechanisms for alkaline tolerance. This research offers clues to accelerate breeding programs for new alkaline-tolerance rice varieties.

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