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Regulatory effects of gibberellin and cytokinin on citrus peel cell wall metabolism
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Regulatory effects of gibberellin and cytokinin on citrus peel cell wall metabolism
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Journal Article
Regulatory effects of gibberellin and cytokinin on citrus peel cell wall metabolism
2025
Overview
During citrus fruit development, exogenous gibberellin (GA) and 6-benzylaminopurine (6-BA, a synthetic cytokinin (CTK)) are both known to promote citrus peel thickness; however, the differences in their regulatory mechanisms on cell wall metabolism in citrus peels remain unclear. In this study, we found that GA treatment significantly increased cell wall polysaccharides in citrus peels, such as pectin and cellulose, whereas 6-BA treatment led to a notable accumulation of lignin. RNA-sequencing data revealed that several fruit ripening-related cell wall degradation genes, such as
PME3
,
PL18
, and
EXPA1
/
8
, exhibited decreased expression levels in both GA and 6-BA treatments. Additionally, a set of cell wall polysaccharide synthesis genes was upregulated in response to GA treatment but was largely downregulated in 6-BA-treated peels. Conversely, a group of lignin biosynthesis genes was upregulated in 6-BA-treated peels. GA treatment inhibited DELLA proteins (encoded by
RGA
and
GAI
) in the GA signaling pathway, whereas 6-BA treatment increased the expression of B-ARRs (
ARR1
and
ARR2
) in the CTK signaling pathway. Furthermore, GA treatment elevated endogenous CTK levels, while 6-BA treatment also enhanced endogenous GA content, suggesting a reciprocal interaction between these two hormonal pathways.
Publisher
BioMed Central,BioMed Central Ltd,Springer Nature B.V,BMC
Subject
/ B-ARRs
/ Benzyl Compounds - pharmacology
/ Biomedical and Life Sciences
/ Citrus
/ DELLAs
/ Fruit - growth & development
/ fruiting
/ Fruits
/ Gene Expression Regulation, Plant - drug effects
/ Genes
/ Lignin
/ Pectin
/ pectins
/ Plant Growth Regulators - metabolism
/ Plant Growth Regulators - pharmacology
/ Polysaccharides - metabolism
/ Purines
/ Regulatory mechanisms (biology)
/ Ripening
/ Trees
