Genome-Wide Association Analysis Identifies Candidate Loci for Callus Induction in Rice (Oryza sativa L.).

Area of Science:

• Plant Science
• Genetics
• Biotechnology

Background:

• Callus induction (CI) is crucial for plant genetic transformation.
• Understanding the genetic basis of CI is essential for improving rice breeding techniques.

Purpose of the Study:

• To conduct a genome-wide association study (GWAS) to identify quantitative trait loci (QTLs) and candidate genes for callus induction in rice.
• To analyze the association of identified genes with callus induction percentages across different tissue culture media.

Main Methods:

• Genome-wide association study (GWAS) on 110 Indica rice accessions.
• Callus induction assays using three media: B5, MS, and N6.
• Identification and analysis of QTLs and candidate genes within associated haplotype blocks.

Main Results:

• Seven QTLs associated with CI percentage were identified on rice chromosomes 2, 6, 7, and 11.
• Fifty-five genes were located within QTL regions, with 31 showing associations with varying CI percentages.
• A Caleosin-related family protein gene was strongly associated with CI in B5 and N6 media.
• Genes encoding beta-tubulin, zinc finger protein, RNP-1 domain-containing protein, and lysophosphatidic acid acyltransferase were linked to CI in N6 medium.

Conclusions:

• The study identified key QTLs and candidate genes for rice callus induction, including a Caleosin-related gene.
• These findings provide valuable genetic resources for enhancing callus formation and advancing molecular breeding in rice.
• The identified genes offer potential targets for genetic manipulation to improve rice transformation efficiency.