AI Article Synopsis

  • Flavonoids are important compounds in plants, but their production and regulation during day/night cycles are not well understood.
  • This study identified three proteins (MsMYB206, MsMYB450, and MsHY5) that interact to regulate flavonoid biosynthesis, showing that MsMYB206 activates specific flavonoid genes and has higher expression at night.
  • Additionally, MsMYB206-overexpressing plants showed increased salt tolerance and higher flavonoid levels compared to wild type, highlighting a regulatory mechanism for fluctuating flavonoid levels linked to environmental stress.

Article Abstract

Flavonoids are the major secondary metabolites participating in many biological processes of plants. Although flavonoid biosynthesis has been extensively studied, its regulatory mechanisms during the day and night cycles remain poorly understood. In this study, three proteins, MsMYB206, MsMYB450, and MsHY5, were found to interact with each other, in which MsMYB206 directly transactivated two flavonoid biosynthetic genes, MsFLS and MsF3'H. The expression patterns of MsMYB206, MsMYB450, MsFLS, and MsF3'H were fully consistent at regular intervals across day/night cycles that were higher at night than in the daytime. On the contrary, both gene expression levels and protein contents of MsHY5 increased in the daytime but decreased at night, and the lower expression of MsHY5 at night led to strengthened interaction between MsMYB206 and MsMYB450. The MsMYB206-overexpression plants were more salt-tolerant and their flavonoid contents were higher than the WT during the day/night cycles. This study revealed one mechanism interpreting the fluctuating flavonoid contents during day/night cycles regulated by the MsMYB206/MsMYB450/MsHY5-MsFLS/MsF3'H module that also contributed to salt tolerance in alfalfa.

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Source
http://dx.doi.org/10.1111/tpj.17216DOI Listing

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Article Synopsis
  • Flavonoids are important compounds in plants, but their production and regulation during day/night cycles are not well understood.
  • This study identified three proteins (MsMYB206, MsMYB450, and MsHY5) that interact to regulate flavonoid biosynthesis, showing that MsMYB206 activates specific flavonoid genes and has higher expression at night.
  • Additionally, MsMYB206-overexpressing plants showed increased salt tolerance and higher flavonoid levels compared to wild type, highlighting a regulatory mechanism for fluctuating flavonoid levels linked to environmental stress.
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