Endogenous Plant Hormone Level and Its Regulation Mechanism during Growth of Tea Plant Shoot (IV) Effects of Exogenous Growth Regulators on Endogenous Hormones and Their Relation to Shoot Growth in Tea Plant

In this study,the effects of exogenous NAA,GA 3 and Cuifasu spraying on the endogenous plant hormone level were analysed in tea plant shoots and their relation to the shoot growth was investigated.In NAA treated tea plant,a significant increase in ABA and IAA content was found in the initially developing shoots,which was accompanied by an inhibition of shoot growth,and then endogenous Zeatin content rose,promoting the shoot growth.GA 3 spraying led to a decrease in endogenous ABA and IAA content,but a rise in endogenous GA 3 and Zeatin level.This change in GA 3 treated plant brought a greater shoot growth rate and thus a greater growth amount.Cuifasu treatment resulted in a decrease in endogenous IAA content,promote the shoot development and growth,and thus gave a higher yeild of green tea leaves. [WT5”HZ]