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The chloroplast-localized proteins play roles in plant salt stress response, but their mechanisms remain largely unknown. In this study, we screened a yellow leaf mutant,  yl1-1 , whose shoots exhibited hypersensitivity to salt stress. We mapped  YL1  to AT3G57180, which encodes a YqeH-type GTPase. YL1, as a chloroplast stroma-localized protein, could be markedly reduced by high salinity. Upon exposure to high salinity, seedling shoots of  yl1-1  and  yl1-2  accumulated significantly higher levels of Na +  than wild type. Expression analysis of factors involved in plant salt stress response showed that the expression of  ABI4  was increased and  HKT1  was evidently suppressed in mutant shoots compared with the wild type under normal growth conditions. Moreover, salinity effects on  ABI4  and  HKT1  were clearly weakened in the mutant shoots, suggesting that the loss of YL1 function impairs  ABI4  and  HKT1  expression. Notably, the shoots of  yl1-2 abi4  double mutant exhibited stronger resistance to salt stress and accumulated less Na +  levels after salt treatment compared with the  yl1-2  single mutant, suggesting the salt-sensitive phenotype of  yl1-2  seedlings could be rescued via loss of ABI4 function. These results reveal that YL1 is involved in the salt stress response of seedling shoots through ABI4.

Arabidopsis YL1/BPG2 Is Involved in Seedling Shoot Response to Salt Stress through ABI4