How does the gibberellin (GA) biosynthesis inhibitor chlormequat chloride (CCC) affect flowering in rubber trees?

Label:chem

Topic
Chlormequat chloride (CCC) is a well-known growth inhibitor that has the opposite effect of gibberellin (GA). It has been shown to inhibit endogenous GA biosynthesis, thereby affecting plant growth and development.
Answer
Chlormequat chloride (CCC) inhibits flowering in rubber trees by reducing the biosynthesis of endogenous gibberellin. Treatment with CCC leads to a decrease in the expression of key GA biosynthesis genes (e.g., HbGA20ox) and an increase in the expression of DELLA proteins (e.g., HbGAI and HbRGL), which are negative regulators of GA signaling. This results in the downregulation of flowering-related genes (e.g., HbAGL, HbFLC, HbSOC1, and HbLFY), thereby suppressing flowering. The study suggests that CCC can be used to control flowering in rubber trees, potentially improving latex yield by redirecting nutrients from reproductive to vegetative growth.
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