Journal
PLANT BIOLOGY
Volume 24, Issue 1, Pages 52-61Publisher
WILEY
DOI: 10.1111/plb.13350
Keywords
cold tolerance; caleosin; JA signalling pathway; lipid droplet; rice
Categories
Funding
- Program for Changjiang Scholars, Guangdong YangFan Innovative and Entrepreneurial Research Team Project [2015YT02H032]
- National Natural Science Foundation of China [31701410, 32000493]
- Natural Science Foundation of Guangdong Province of China [2020A1515010964]
- Science and Technology Plan Project of Guangdong Province of China [2017A020208027]
- special fund for scientific innovation strategy-construction of the High-Level Academy of Agriculture Science [R2018PY-QY005]
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Caleosin protein OsClo5 plays a role in cold stress tolerance by influencing and regulating the JA signaling pathway. Its expression is upregulated under stress conditions, and it regulates plant cold resistance by inhibiting jasmonate signaling and JA synthesis.
Caleosin is a lipid droplet-binding protein involved in maintenance of the lipid droplet structure and in signal transduction. However, the role of caleosin proteins in stress resistance is limited. Here, we report data for a rice caleosin protein gene, OsPXG1, involved in cold stress tolerance via influence and regulation of the JA signalling pathway. Overexpression lines and RNAi lines of OsClo5 were subjected to cold stress and recovery to measure electrolyte leakage and survival rate. Changes were also detected in the genome-wide transcriptome of OsClo5 overexpressed plants. OsClo5 is located mainly in lipid droplets and expressed in all tissues tested. Its expression was upregulated by various stress conditions when subjected to cold treatment. Overexpression of OsClo5 decreased cold tolerance, and RNAi lines of OsClo5 had higher survival than WT seedlings. OsClo5 inhibited one jasmonate biosynthetic gene and several jasmonate ZIM domain (JAZ) genes, which were upregulated in response to cold stress. OsClo5 is a constitutively expressed caleosin protein that regulates plant cold resistance through inhibition of jasmonate signalling and JA synthesis.
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