The abstract is read at the publisher; the summary is JClub's.
High temperature (30 °C) attenuates MaPUB23-mediated proteasomal degradation of MaHSFB1 and MaHDA2, sustaining MaHSFB1–MaHDA2 repression of chlorophyll catabolic genes in banana fruit.
- Why it matters: Banana fruits ripen with softened texture but retain a green peel at ≥30 °C, and the mechanism behind this repression of chlorophyll breakdown limits efforts to improve market quality.
- What they did: Banana fruits ripened at 20 °C versus 30 °C were compared by transcriptome analysis to identify E3 ubiquitin ligases repressed at 30 °C; MaPUB23 was then tested by transient overexpression in tobacco leaves and by interaction/ubiquitination assays.
- The result: MaPUB23 interacted with and ubiquitinated MaHSFB1 and MaHDA2 for proteasomal degradation, but high temperature reduced this degradation, increasing MaHSFB1–MaHDA2 repression of CCGs via decreased histone acetylation and inhibiting chlorophyll degradation.
The findingWhy it mattersWhat they didThe result
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