Effect of An Exogenous IAA Treatment on the Color Quality and Antioxidant Activity of Postharvest Shanghai Pak Choi
XU Xiaoyang
ZHU Yiran
MA Wenqi
LI Pengxia
Abstract：In order to clarify the effects of exogenously applied indoleacetic acid(IAA)on postharvest Shanghai pak choi,distilled water spraying was used as a control group in this study,the changes in chlorophyll content,chlorophyll metabolism-related gene expression and enzyme activities,IAA metabolic pathway-related gene expression,endogenous hormone content,and antioxidant-related gene expression and enzyme activities during the senescence process of postharvest pak choi were investigated.It was found that the colour quality of postharvest pak choi was effectively maintained and its leaf senescence was delayed by exogenous application of IAA at 2 mg/L,mainly by reducing the expression of chlorophyll metabolism-related genes(BrNYC1,BrNOL,BrPPH,BrPAO,BrSGR1,and BrSRG2)and enzyme activities(PPH,PAO,and MDcase)to delay the degradation of chlorophyll.Meanwhile,the expression of growth hormone signalling transduction pathway-related genes(BrARF2,BrARF7,BrARF19,BrGH3.5,BrGH3.12,and BrGH3.17)could be regulated by IAA to maintain the endogenous IAA content in postharvest pak choi.In addition,the IAA treatment could increase the expression of antioxidant metabolism-related genes(BrCAT,BrPOD,and BrSOD)to increase the activities of antioxidant enzymes,catalase(CAT),peroxidase(POD),and superoxide dismutase(SOD)and enhance the antioxidant properties of postharvest pak choi.In summary,an exogenous IAA treatment can effectively maintain the colour quality of pak choi and delay its leaf senescence.These findings of this study provide a basis for the development of postharvest technologies for Shanghai pak choi.
Keywords：pak choiIAApostharvestchlorophyllantioxidantgene
Publication Date：2026-01-20
Online Publishing Date：2026-03-31(First online date of this platform, not the publication date of the document)
Pages：11( 170-180 )