OsSDG721,SDG721

| Categories genes  | Tags leaf  grain  alkaline stress  salt  tolerance  potassium  grain size  salt stress  stress  homeostasis  transporter  plant height  methyltransferase  grain weight  stress tolerance  leaf angle  development  plant development  panicle  ga  branching  GA  GA biosynthesis 
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  • Key message
    • Transgenic plants overexpressing OsSDG721 showed saline-alkaline stress-tolerant phenotypes, along with increased leaf angle, advanced heading and ripening dates
    • By contrast, ossdg721 loss-of-function mutants showed increased sensitivity to saline-alkaline stress characterized by decreased survival rates and reduction in plant height, grain size, grain weight and leaf angle
    • Furthermore, we showed that OsSDG721 binds to and deposits the H3K4me3 mark in the promoter and coding region of OsHKT1;5, thereby upregulating OsHKT1;5 expression under saline-alkaline stress
    • Overall, by generating Kitaake activation-tagging pools, we established that the H3K4 methyltransferase OsSDG721 enhances saline-alkaline stress tolerance in rice
    • RNA sequencing (RNA-seq) analysis of wild-type Kitaake and ossdg721 mutants indicated that OsSDG721 positively regulates the expression level of HIGH-AFFINITY POTASSIUM (K+ ) TRANSPORTER1;5 (OsHKT1;5), which encodes a Na+ -selective transporter that maintains K+ /Na+ homeostasis under salt stress
    • Here, we report that SDG721 (SET-domain group protein 721) and SDG705 are involved in regulating rice development
    • Together, these results suggest that SDG721 and SDG705 regulate H3K4 methylation, which is crucial for plant development in rice
    • Loss of SDG721 and SDG705 function resulted in GA-deficient phenotypes, including semi-dwarfism, reduced cell length, and reduced panicle branching
    • The transcripts levels and H3K4me3 levels of GA biosynthesis genes and GA signaling pathway genes were downregulated in the sdg721 sdg705 plants
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