首页|The safflower bHLH transcription factor CtbHLH41 negatively regulates SA-induced leaf senescence through interaction with CtCP1
The safflower bHLH transcription factor CtbHLH41 negatively regulates SA-induced leaf senescence through interaction with CtCP1
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NSTL
Elsevier
? 2022 Elsevier B.V.Salicylic acid (SA) plays an important role in regulating leaf senescence. However, the molecular mechanism of leaf senescence of safflower (Carthamus tinctorius) is still elusive. In this study, we found that the bHLH transcription factor (TF) CtbHLH41 in Carthamus tinctorius significantly delayed leaf senescence and inhibited the expression of senescence-related genes. In order to explore how CtbHLH41 promotes leaf senescence, we carried out yeast two-hybrid screening. In this study, by exploring the mechanism of CtbHLH41 regulating CtCP1, it was found that CtCP1 promoted the hydrolysis of CtbHLH41 protein, accelerated the transcriptional activities of salicylic acid-mediated senescence-related genes CtSAG12 and CtSAG29, chlorophyll degradation genes CtNYC1 and CtNYE1, and accelerated leaf senescence. We found a negative SA regulator CtANS1, which interacted with CtbHLH41 and regulated its stability, thereby inhibiting CtCP1-mediated leaf senescence. In short, our results provide a new insight into the mechanism of CtbHLH41 actively regulating the senescence of safflower leaves induced by SA.
College of Life Sciences Engineering Research Center of the Chinese Ministry of Education for Bioreactor and Pharmaceutical Development Jilin Agricultural University
NSTL
Elsevier
