Deciphering the genetic architecture of anther culturability in rice using segregation distortion approach

Abstract

Anther culture is a promising technique used in rice (Oryza sativa L.) breeding, although the genetic mechanisms associated with anther culturability remain elusive. In the process of in vitro anther culture, favorable alleles for anther culture are preferentially transmitted to doubled haploid (DH) populations, resulting in biased segregation of DH populations. Therefore, the segregation distortion (SD) method is an ideal approach for mapping the genetic loci controlling anther culturability. Performing a SD analysis using a genetic map consisting of 666 SNP markers, we identified five potential loci (LOD>3.5) that may be associated with anther culturability, including SDL2 and SDL3, which are overrepresented in japonica alleles, and SDL7, SDL9, and SDL11, which are overrepresented in indica alleles. In addition, nine pairs of epistatic interactions (EPIs) that contribute significantly (P<0.05) to segregation distortion in the DH population were identified. Among them, the interaction between SDL2 and SDL3 is particularly noteworthy. These findings suggest that anther culturability in rice is governed by complex genetic mechanisms involving multiple nuclear genes and epistatic interactions. This study provides insights into the genetic control underlying anther culturability in rice and lays the foundation for future research aimed at identifying causal genes associated with anther culturability.

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