Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 69, Issue 3, Pages 1039-1048Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.0c07220
Keywords
ABA biosynthesis; dehydration stress; DNA methylation; histone modifications; tea processing
Funding
- National Key Research and Development Program of China [2018YFD1000601]
- Basic Frontier Science Research Program of Chinese Academy of Sciences [ZDBS-LYSM032]
- Regional Key Project of Science and Technology Service Network Plan of Chinese Academy of Sciences [KFJ-STS-QYZX-093]
- Guangdong Natural Science Foundation f or Distingu ished Young Scholar [2016A030306039]
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This study discovered that dehydration stress during postharvest processing of tea increases the expression of ABA biosynthesis genes, leading to enhanced ABA accumulation. The results suggest that epigenetic modifications play a crucial role in ABA synthesis during tea postharvest processing.
The plant hormone abscisic acid (ABA) accumulates in tea leaves under dehydration stress during the withering process. However, the mechanism underlying ABA biosynthesis regulation remains largely unclear. In the present study, we found increased expression of ABA biosynthesis genes under dehydration stress during postharvest processing of tea. Furthermore, dehydration stress promoted ABA accumulation by increasing histone acetylation of ABA anabolism genes but by decreasing the levels of histone H3 lysine 9 dimethylation and DNA methylation of ABA biosynthesis genes. We screened candidate regulators of histone deacetylation and DNA methylation under dehydration stress. Taken together, our results indicate a role for epigenetic modifications during postharvest processing of tea.
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