English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The basic helix-loop-helix (bHLH) transcription factors (TFs) play important roles in regulating multiple biological processes in plants. However, there are few reports about the function of bHLHs in flower senescence. In this study, a bHLH TF,  PhFBH4 , was found to be dramatically upregulated during flower senescence. Transcription of  PhFBH4  is induced by plant hormones and abiotic stress treatments. Silencing of  PhFBH4  using virus-induced gene silencing or an antisense approach extended flower longevity, while transgenic petunia flowers with an overexpression construct showed a reduction in flower lifespan. Abundance of transcripts of senescence-related genes ( SAG12 ,  SAG29 ) was significantly changed in petunia  PhFBH4  transgenic flowers. Furthermore, silencing or overexpression of  PhFBH4  reduced or increased, respectively, transcript abundances of important ethylene biosynthesis-related genes,  ACS1  and  ACO1 , thereby influencing ethylene production. An electrophoretic mobility shift assay showed that the PhFBH4 protein physically interacted with the G-box  cis -element in the promoter of  ACS1,  suggesting that  ACS1  was a direct target of the PhFBH4 protein. In addition, ectopic expression of this gene altered plant development including plant height, internode length, and size of leaves and flowers, accompanied by alteration of transcript abundance of the gibberellin biosynthesis-related gene  GA2OX3 . Our results indicate that  PhFBH4  plays an important role in regulating plant growth and development through modulating the ethylene biosynthesis pathway.

A basic helix-loop-helix transcription factor, PhFBH4, regulates flower senescence by modulating ethylene biosynthesis pathway in petunia