Work

Screening of germplasm resources and QTL mapping for germinability under submerged condition in rice (Oryza sativa L.)

Year: 2020

Type: article

Abstract: Screening of germplasm resources, exploiting and utilization of genes conferring tolerance to hypoxia are the key to breeding new cultivars adapted to direct seeding. In order to evaluate the germinability of germplasm resources under submerged condition in a simple and efficient way, 191 japonica germplasm resources released from different years and regions were screened, 12 japonica varieties with high germinability under submerged condition were found. Among them, Lianjing 15, a japonica variety, showed stable and high tolerance to hypoxia. Using a F2:3 population derived from Lianjing 15 and Huanglizhan (HLZ, a highly susceptible indica rice variety), four quantitative trait loci (QTL) conferring tolerance to hypoxia, namely qGS1, qGS3, qGS9, and qGS10 were identified under simulated field environment, and they explained 70.9% of the total phenotypic variation. Among them, qGS1, qGS3, and qGS10, were repeatedly detected in different years, accounting for 19.2%–24.0%, 12.6%–14.7%, and 19.1%–20.5% of the total phenotypic variation, respectively. The germplasm resources and QTL found in our study would provide innovative resources for breeding rice cultivars with high germinability under submerged condition, and would also provide a theoretical basis for breeding varieties adapted to direct seeding.

Source: ACTA AGRONOMICA SINICA

DOI: 10.3724/sp.j.1006.2021.02030