Effects of Exogenous 6-BA and GA3 on Ethylene Release Amount,Polyamine Content and Membrance Lipid Peroxidation of Melon Leaves
ZHAO Weixing
LI Xiaohui
GAO Ningning
KANG Liyun
CHANG Gaozheng
LI Hailun
WANG Huiying
Abstract：The aims are to clarify the physiological mechanism of 6-BA and GA3 regulating melon leaf senescence and to provide a theoretical basis for their application in delaying leaf senescence.Early-maturing thick-skinned variety'Xuetong No.9'was used as the test materials,which were sprayed on the leaves by 30 mg/kg 6-BA and 20 mg/kg GA3 at flowering and fruit setting stage under protected cultivation conditions,with water as the control.The changes in relative chlorophyll content(SPAD value),ethylene release amount,polyamine content,catalase(CAT)activity,malondialdehyde(MDA)content,hydrogen peroxide(H₂O₂)content of leaves,and yield were investigated.The results showed that the SPAD values were increased by 1.78%—8.04%and 0.37%—6.08%,while ethylene release amount was reduced by 5.12%—28.46%and 2.34%—18.80%respectively with exogenous 6-BA and GA3 treatments,and the contents of MDA,H2O2 and putrescine rescine in leaves were also decreased,while the contents of spermine,spermidine and CAT activity were increased,and the yields were also increased by 6.70%and 4.75%respectively.Overall,both exogenous hormone treatments showed more pronounced effects in the early stage,with their efficacy gradually diminishing over time.These findings indicate that 6-BA and GA₃can enhance leaf anti-aging capacity and delay senescence by regulating ethylene release,polyamine metabolism,and membrane lipid peroxidation.
Keywords：Melon6-BAGA3Ethylene releasePolyamineMembrance lipid peroxidation
Publication Date：2026-01-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：7( 132-138 )