期刊
HORTICULTURE RESEARCH
卷 9, 期 -, 页码 -出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/hr/uhac130
关键词
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资金
- earmarked fund for CARS [CARS-31]
- National Natural Science Foundation of China [31372112]
- Guangdong Provincial Special Fund For Modern Agriculture Industry Technology Innovation Teams [2022KJ109]
- Pearl River Talent Program for Young Talent [2017GC010321]
- National Key Research and Development Program [2016YFD0400103]
- Young Innovative Talents Projects in Ordinary Colleges and Universities in Guangdong Province [2021KQNCX005]
This study found that exogenous ABA can alleviate chilling injury in bananas by activating gene expressions related to unsaturated fatty acids and flavonoids, thereby increasing cold tolerance.
Abscisic acid (ABA) is a phytohormone essential for plants to respond to various environmental stresses, and abscisic acid-insensitive 5 (ABI5) is a basic leucine zipper transcription factor of the ABA signaling pathway. Exogenous ABA induces cold tolerance in bananas; however, the role of MaABI5-like in ABA-induced cold tolerance remains unexplored. The present study found that exogenous ABA alleviated chilling injury of 'Fenjiao' banana, induced the accumulation of endogenous ABA, unsaturated fatty acids, and flavonoid content, and reduced the saturated fatty acid content. Moreover, ABA treatment upregulated the transcription levels of MaABI5-like, fatty acid desaturation genes, and flavonoid synthesis-related genes during cold storage. More interestingly, MaABI5-like directly interacted with the promoter of genes related to fatty acid desaturation (MaFAD3-1, MaFAD3-4, MaFAD3-5, MaFAD6-2, MaFAD6-3) and flavonoid synthesis (MaPAL-like, MaPAL-like1, MaC4H-like3, Ma4CL-like1, Ma4CL-like10, MaCHS6-4-like, and MaFLS) and activated their expressions. Furthermore, the transient overexpression of MaABI5-like in 'Fenjiao' banana fruit and ectopic expression in tomato plants enhanced cold tolerance and upregulated fatty acid desaturation and flavonoid synthesis-related gene transcript levels. The reduced expression of MaABI5-like by virus-induced gene silencing in 'Fenjiao' banana increased chilling injury and downregulated the expression of fatty acid desaturation and flavonoid synthesis-related genes. Thus, the study indicates that MaABI5-like regulates ABA-induced cold tolerance by increasing unsaturated fatty acid and flavonoid content.
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