Genetic Dissection of Salt Tolerance and Yield Traits of Geng (japonica) Rice by Selective Subspecific Introgression

Author:

Li Simin1,Feng Ting1,Zhang Chenyang1,Zhang Fanlin1,Li Hua1,Chen Yanjun1,Liang Lunping1,Zhang Chaopu1,Zeng Wei1ORCID,Liu Erbao1,Shi Yingyao1,Li Min1,Meng Lijun2

Affiliation:

1. College of Agronomy, Anhui Agricultural University, Hefei 230036, China

2. Kunpeng Institute of Modern Agriculture at Foshan, Foshan 528200, China

Abstract

Salinity is a major factor limiting rice productivity, and developing salt-tolerant (ST) varieties is the most efficient approach. Seventy-eight ST introgression lines (ILs), including nine promising lines with improved ST and yield potential (YP), were developed from four BC2F4 populations from inter-subspecific crosses between an elite Geng (japonica) recipient and four Xian (indica) donors at the Institute of Crop Sciences, Chinese Academy of Agricultural Sciences. Genome-wide characterization of donor introgression identified 35 ST QTLs, 25 of which harbor 38 cloned ST genes as the most likely QTL candidates. Thirty-four are Xian-Geng differentiated ones with the donor (Xian) alleles associated with ST, suggesting differentiated responses to salt stress were one of the major phenotypic differences between the two subspecies. At least eight ST QTLs and many others affecting yield traits were identified under salt/non-stress conditions. Our results indicated that the Xian gene pool contains rich ‘hidden’ genetic variation for developing superior Geng varieties with improved ST and YP, which could be efficiently exploited by selective introgression. The developed ST ILs and their genetic information on the donor alleles for ST and yield traits would provide a useful platform for developing superior ST and high-yield Geng varieties through breeding by design in the future.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Anhui Province

The Science and Technology Major Project of Anhui Province

Improved Varieties Joint Research (Rice) Project of Anhui Province

Postgraduate entrepreneurship and Innovation Program

Postgraduate Science Research Project of Anhui Province

Publisher

MDPI AG

Subject

Microbiology (medical),Molecular Biology,General Medicine,Microbiology

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