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- W4319333750 endingPage "1428" @default.
- W4319333750 startingPage "1408" @default.
- W4319333750 abstract "Banana (Musa acuminata) fruits ripening at 30 °C or above fail to develop yellow peels; this phenomenon, called green ripening, greatly reduces their marketability. The regulatory mechanism underpinning high temperature-induced green ripening remains unknown. Here we decoded a transcriptional and post-translational regulatory module that causes green ripening in banana. Banana fruits ripening at 30 °C showed greatly reduced expression of 5 chlorophyll catabolic genes (CCGs), MaNYC1 (NONYELLOW COLORING 1), MaPPH (PHEOPHYTINASE), MaTIC55 (TRANSLOCON AT THE INNER ENVELOPE MEMBRANE OF CHLOROPLASTS 55), MaSGR1 (STAY-GREEN 1), and MaSGR2 (STAY-GREEN 2), compared to those ripening at 20 °C. We identified a MYB transcription factor, MaMYB60, that activated the expression of all 5 CCGs by directly binding to their promoters during banana ripening at 20 °C, while showing a weaker activation at 30 °C. At high temperatures, MaMYB60 was degraded. We discovered a RING-type E3 ligase MaBAH1 (benzoic acid hypersensitive 1) that ubiquitinated MaMYB60 during green ripening and targeted it for proteasomal degradation. MaBAH1 thus facilitated MaMYB60 degradation and attenuated MaMYB60-induced transactivation of CCGs and chlorophyll degradation. By contrast, MaMYB60 upregulation increased CCG expression, accelerated chlorophyll degradation, and mitigated green ripening. Collectively, our findings unravel a dynamic, temperature-responsive MaBAH1-MaMYB60-CCG module that regulates chlorophyll catabolism, and the molecular mechanism underpinning green ripening in banana. This study also advances our understanding of plant responses to high-temperature stress." @default.
- W4319333750 created "2023-02-08" @default.
- W4319333750 creator A5019752218 @default.
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- W4319333750 creator A5037220864 @default.
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- W4319333750 creator A5065223931 @default.
- W4319333750 creator A5068912096 @default.
- W4319333750 creator A5080235395 @default.
- W4319333750 date "2023-02-07" @default.
- W4319333750 modified "2023-10-09" @default.
- W4319333750 title "Proteasomal degradation of MaMYB60 mediated by the E3 ligase MaBAH1 causes high temperature-induced repression of chlorophyll catabolism and green ripening in banana" @default.
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- W4319333750 doi "https://doi.org/10.1093/plcell/koad030" @default.
- W4319333750 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36748200" @default.
- W4319333750 hasPublicationYear "2023" @default.