AcbHLH144 transcription factor negatively regulates phenolic biosynthesis to modulate pineapple internal browning.

ABSTRACT: Internal browning (IB), a major physiological disorder of pineapples, usually happens in postharvest processes, but the underlying mechanism remains elusive. The bHLH transcription factors are involved in regulating various biological processes, but whether they could regulate tissue browning in fruit during storage remains unknown. Here we showed that the phenolic biosynthesis pathway was activated in pineapples showing IB following 9 days of storage. AcbHLH144 expression was the highest of the 180 transcription factors identified, downregulated in pineapple with IB, and negatively correlated with the major phenolic biosynthetic genes. AcbHLH144 was shown to be localized in the nucleus and its transient overexpression in pineapples and overexpression in Arabidopsis decreased

SUBMITTER: Li Q 

PROVIDER: S-EPMC10611554 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature