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The novel protein CSAP accelerates leaf senescence and is negatively regulated by SAUL1 in the dark

Authors
So, Won MiKim, Soo YounHyoung, SujinShin, Jeong Sheop
Issue Date
3월-2020
Publisher
SPRINGER
Keywords
Arabidopsis; CSAP; Dark-induced leaf senescence; ABA; Protein degradation; SAUL1
Citation
PLANT CELL REPORTS, v.39, no.3, pp.325 - 334
Indexed
SCIE
SCOPUS
Journal Title
PLANT CELL REPORTS
Volume
39
Number
3
Start Page
325
End Page
334
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/57516
DOI
10.1007/s00299-019-02493-z
ISSN
0721-7714
Abstract
Key message The chloroplast-localized protein CSAP is an ABA-responsive factor and positively regulates dark-induced senescence. This phenomenon is controlled by SAUL1 in Arabidopsis. We report here that CSAP (Chloroplast-localized Senescence-Associated Protein, AT5G39520) functions as a positive regulator of senescence and is controlled by SAUL1 (Senescence Associated E3 Ubiquitin Ligase 1) in Arabidopsis. CSAP transcript level was gradually increased when senescence was progressed. Under dark conditions, the csap mutant showed delayed leaf senescence and reduced chlorophyll breakdown, but overexpression of CSAP accelerated leaf senescence and expressions of chlorophyll catabolic genes were up-regulated compared to the wild-type (WT). NCED3 and AAO3, which are involved in ABA biosynthesis, also showed higher expression in the overexpression lines than the WT. It is known that the CSAP transcript is increased in the saul1 mutant that shows precocious senescence. In our experiments, we confirmed that CSAP interacts with SAUL1 by the yeast two-hybrid and pull-down assays. In addition, we found that SAUL1 decreases the stability of CSAP in the presence of ABA. Taken together, we suggest that CSAP accelerates leaf senescence in the dark and this process is controlled by SAUL1.
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SHIN, Jeong Sheop
생명과학대학 (생명과학부)
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