Identification of QTLs for Salt Tolerance at the Germination and Seedling Stages in Rice
1
National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China
2
College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
*
Author to whom correspondence should be addressed.
Plants 2021, 10(3), 428; https://doi.org/10.3390/plants10030428
Received: 24 January 2021
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Revised: 8 February 2021
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Accepted: 19 February 2021
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Published: 24 February 2021
(This article belongs to the Special Issue Genetic Resources and Crop Improvement)
Rice is highly sensitive to salinity stress during the seedling establishment phase. Salt stress is widely occurring in cultivated areas and severely affects seed germination ability and seedling establishment, which may result in a complete crop failure. The objective of the present study is to identify quantitative trait loci (QTLs) related to salt tolerance of the germination and seedling stages in a rice backcross inbred line (BIL) population that was derived from a backcross of an Africa rice ACC9 as donor and indica cultivar Zhenshan97 (ZS97) as the recurrent parent. Under salt stress, ACC9 exhibited a higher germination percentage, but more repressed seedling growth than ZS97. Using the BIL population, 23 loci for germination parameters were detected at the germination stage and 46 loci were identified for several morphological and physiological parameters at the seedling stage. Among them, nine and 33 loci with the ACC9 alleles increased salt tolerance at the germination and seedling stages, respectively. Moreover, several major QTLs were found to be co-localized in the same or overlapping regions of previously reported genes for salt stress. These major loci will facilitate improving salt-tolerance rice in genome-breeding programs.
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Keywords:
Africa cultivated rice; salt tolerance; seedling establishment; quantitative trait loci (QTLs); backcross inbred lines (BIL)
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MDPI and ACS Style
Nakhla, W.R.; Sun, W.; Fan, K.; Yang, K.; Zhang, C.; Yu, S. Identification of QTLs for Salt Tolerance at the Germination and Seedling Stages in Rice. Plants 2021, 10, 428. https://doi.org/10.3390/plants10030428
AMA Style
Nakhla WR, Sun W, Fan K, Yang K, Zhang C, Yu S. Identification of QTLs for Salt Tolerance at the Germination and Seedling Stages in Rice. Plants. 2021; 10(3):428. https://doi.org/10.3390/plants10030428
Chicago/Turabian StyleNakhla, Walid R., Wenqiang Sun, Kai Fan, Kang Yang, Chaopu Zhang, and Sibin Yu. 2021. "Identification of QTLs for Salt Tolerance at the Germination and Seedling Stages in Rice" Plants 10, no. 3: 428. https://doi.org/10.3390/plants10030428
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