LcERF10 functions as a positive regulator of litchi fruitlet abscission

Phytohormone ethylene is well-known in positive modulation of plant organ abscission. However, the molecular mechanism underlying ethylene-induced abscission remains largely unknown. Here, we identified an ethylene-responsive factor, LcERF10, as a key regulatory gene in litchi fruitlet abscission. L...

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Bibliographic Details
Published in:International journal of biological macromolecules 2023-10, Vol.250, p.126264-126264, Article 126264
Main Authors: He, Zidi, Ma, Xingshuai, Wang, Fei, Li, Jianguo, Zhao, Minglei
Format: Article
Language:English
Subjects:
Cytosolic pH
ERF
Fruitlet abscission
Litchi (Litchi chinensis Sonn.)
Na+/H+ exchanger
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Summary:Phytohormone ethylene is well-known in positive modulation of plant organ abscission. However, the molecular mechanism underlying ethylene-induced abscission remains largely unknown. Here, we identified an ethylene-responsive factor, LcERF10, as a key regulatory gene in litchi fruitlet abscission. LcERF10 was strongly induced in the fruitlet abscission zone (FAZ) during the ethylene-activated abscission. Silencing of LcERF10 in litchi weakened the cytosolic alkalization of the FAZ and reduced fruitlet abscission. Moreover, LcERF10 directly bound the promoter and repressed the expression of LcNHX7, a Na+/H+ exchanger that was down-regulated in FAZ following the ethylene-activated abscission and up-regulated after LcERF10 silencing. Additionally, ectopic expression of LcERF10 in Arabidopsis promoted the cytosolic alkalization of the floral organ AZ and accelerated the floral organ abscission. Collectively, our results suggest that the transcription factor LcERF10 plays a positive role in litchi fruitlet abscission.
ISSN:0141-8130
1879-0003
DOI:10.1016/j.ijbiomac.2023.126264