Effects of zeaxanthin on photosynthesis capacity and xanthophyll cycle of pepper under low temperature and weak light
To further explore the effects of zeaxanthin on weak temperature and weak light tolerance of hot pep-per,the effects of zeaxanthin on the activities of key photosynthetic enzymes,chlorophyll fluorescence parameters,endogenous hormone content,xanthophyll cycle and related gene expression in pepper'Hangjiao 2'under low tem-perature and weak light stress(15℃/5℃,100 μmol·m-2·s-1)were studied,and the physiological mechanism of zeaxanthin in alleviating low temperature and weak light stress of pepper seedlings were explored.The results showed that spraying zeaxanthin significantly increased the photosynthetic capacity of pepper seedlings under low temperature and weak light,and the maximum photochemical quantum yield(Fv/Fm)and actual photochemical quantum yield Y(Ⅱ)were significantly increased by 5.90％and 54.33％,respectively.The contents of jasmonic acid(JA)and aux-in(IAA)increased significantly by 16.70％and 62.30％.The contents of antheraxanthin,violaxanthin,xanthophyll and zeaxanthin in pepper seedlings increased by 1.06,0.48,0.19 times and 1.57 times,respectively.At the same time,the expression of CaZEP gene increased significantly by 3.44,1.64 times and 5.50 times at 24,48,168 h,but there was no significant difference in CaVDE gene expression.To sum up,spraying zeaxanthin might enhance the tol-erance of pepper seedlings to low temperature and low light stress by enhancing the photosynthetic capacity of pepper seedlings,regulating hormone metabolism,and promoting the initiation of xanthophyll cycle in pepper seedlings.
pepperexogenous zeaxanthinlow temperature and weak light stressphotosynthetic capacityxanthophyll cycle
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维普
