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KMID : 0368420190620060429
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Journal of Plant Biology
2019 Volume.62 No. 6 p.429 ~ p.435
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SALT-INDUCED CHLOROPLAST PROTEIN (SCP) is Involved in Plant Tolerance to Salt Stress in Arabidopsis
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Zhuang Yong
Liu Yangxuan
Li Yuxiang
Wei Ming
Tang Yuying
Li Penghui
Liu Zhijian
Li Hui
Huang Weizao
Wang Songhu
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Abstract
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Soil salinization threats the agricultural production and food security worldwide. Salt stress induced plant senescence and chloroplast degradation. However, it remains largely unknown how the chloroplast-localized proteins affect plant response to salt stress. Here, we characterized a novel gene (At5g39520) in Arabidopsis, which is induced by salt stress and encodes a chloroplast-localized protein. Thus, this gene was named SALT-INDUCED CHLOROPLAST PROTEIN (SCP). A T-DNA insertion mutant of SCP gene (scp-1) showed the enhanced tolerance to salt stress, as indicated by the increased survival rates, fresh weights and chlorophyll contents compared with wild type plants under salt treatment. Salt-induced leaf senescence was also delayed in scp-1 mutant. The scp-1 complementation line and SCP overexpression lines displayed the hypersensitivity to salt stress. The qRT-PCR analysis indicated that the transcripts of CHLOROPLAST VESICULATION (CV), which mediates stress-induced chloroplast degradation, were altered in scp-1 mutant and SCP overexpression lines. Taken together, our results suggest that SCP gene plays a negative role in response to salt stress and has potential application for genetic modification of improving plant tolerance to salt stress.
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KEYWORD
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Chloroplast degradation, Leaf senescence, Salt stress, SCP
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