Journal
GENES
Volume 10, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/genes10080562
Keywords
genome; Oryza sativa L; photosynthesis; salinity; yield
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Funding
- National Research Council of Thailand
- Agricultural Research Development Agency under the project Omics sciences for salt-tolerant studies in Thai rice [2555NRCT512302]
- 100th Anniversary Chulalongkorn University Fund for Doctoral Scholarship
- Overseas Research Experience Scholarship for Graduate Students from the Graduate School, Chulalongkorn University
- Outstanding Research Performance Program: Chulalongkorn Academic Advancement into Its 2nd Century Project (CUAASC)
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Unfavourable environmental conditions, including soil salinity, lead to decreased rice (Oryza sativa L.) productivity, especially at the reproductive stage. In this study, we examined 30 rice varieties, which revealed significant differences in the photosynthetic performance responses under salt stress conditions during the reproductive stage, which ultimately affected yield components after recovery. In rice with a correlation between net photosynthetic rate (P-N) and intercellular CO2 concentration (C-i) under salt stress, P-N was found to be negatively correlated with filled grain number after recovery. Applying stringent criteria, we identified 130,317 SNPs and 15,396 InDels between two high-yield rice varieties and two low-yield rice varieties with contrasting photosynthesis and grain yield characteristics. A total of 2089 genes containing high- and moderate-impact SNPs or InDels were evaluated by gene ontology (GO) enrichment analysis, resulting in over-represented terms in the apoptotic process and kinase activity. Among these genes, 262 were highly expressed in reproductive tissues, and most were annotated as receptor-like protein kinases. These findings highlight the importance of variations in signaling components in the genome and these loci can serve as potential genes in rice breeding to produce a variety with salt avoidance that leads to increased yield in saline soil.
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