文献类型： 外文期刊

作者： Zhang Xi-juan ¹ ; Lai Yong-cai ¹ ; Meng Ying ¹ ; Tang Ao ¹ ; Dong Wen-jun ¹ ; Liu You-hong ¹ ; Liu Kai ¹ ; Wang Li-zhi ¹ ; Yang Xian-li ¹ ; Wang Wen-long ¹ ; Ding Guo-hua ¹ ; Jiang Hui ¹ ; Ren Yang ¹ ; Jiang Shu-kun ¹ ;

作者机构： 1.Heilongjiang Acad Agr Sci, Heilongjiang Prov Engn Technol Res Ctr Crop Cold, Inst Crop Cultivat & Tillage, Heilongjiang Prov Key Lab Crop Physiol & Ecol Col, Harbin 150086, Peoples R China

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

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

关键词： japonica rice; direct-seeded rice (DSR); mesocotyl elongation; quantitative trait loci; candidate gene

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：4.8； 五年影响因子：4.8 ）

ISSN： 2095-3119

年卷期： 2023 年 22 卷 2 期

页码：

收录情况： SCI

摘要： Rice direct seeding has the significant potential to save labor and water, conserve environmental resources, and reduce greenhouse gas emissions tremendously. Therefore, rice direct seeding is becoming the major cultivation technology applied to rice production in many countries. Identifying and utilizing genes controlling mesocotyl elongation is an effective approach to accelerate breeding procedures and meet the requirements for direct-seeded rice (DSR) production. This study used a permanent mapping population with 144 recombinant inbred lines (RILs) and 2 828 bin-markers to detect quantitative trait loci (QTLs) associated with mesocotyl length in 2019 and 2020. The mesocotyl lengths of the rice RILs and their parents, Lijiangxintuanheigu (LTH) and Shennong 265 (SN265), were measured in a growth chamber at 30 degrees C in a dark environment. A total of 16 QTLs for mesocotyl length were identified on chromosomes 1(2), 2(4), 3(2), 4, 5, 6, 7, 9, 11(2), and 12. Seven of these QTLs, including qML1a, qML1b, qML2d, qML3a, qML3b, qML5, and qML11b, were reproducibly detected in both years via the interval mapping method. The major QTL, qML3a, was reidentified in two years via the composite interval mapping method. A total of 10 to 413 annotated genes for each QTL were identified in their smallest genetic intervals of 37.69 kb to 2.78 Mb, respectively. Thirteen predicted genes within a relatively small genetic interval (88.18 kb) of the major mesocotyl elongation QTL, qML3a, were more thoroughly analyzed. Finally, the coding DNA sequence variations among SN265, LTH, and Nipponbare indicated that the LOC_Os03g50550 gene was the strongest candidate gene for the qML3a QTL controlling the mesocotyl elongation. This LOC_Os03g50550 gene encodes a mitogen-activated protein kinase. Relative gene expression analysis using qRT-RCR further revealed that the expression levels of the LOC_Os03g50550 gene in the mesocotyl of LTH were significantly lower than in the mesocotyl of SN265. In conclusion, these results further strengthen our knowledge about rice's genetic mechanisms of mesocotyl elongation. This investigation's discoveries will help to accelerate breeding programs for new DSR variety development.