Effects of exogenous hormones on leaf photosynthetic performance and fruit quality of Cabernet Sauvignon grape under high temperature stress
[Objective]To study the effects of exogenous spraying of melatonin(MT)and 2,4-epibrassinolide(EBR)on photosynthetic performance and fruit quality of Cabernet Sauvignon grape under high temperature stress,which pro-vided theoretical basis for enhancing the photosynthetic performance of wine grapes,improving fruit quality and enhan-cing high temperature resistance.[Method]Using wine grape Cabernet Sauvignon as the test material,four treatments were set up,namely,spraying distilled water(control,CK)at natural temperature,high temperature treatment(H treat-ment),high temperature+MT(150 μmol/L)treatment(H+MT treatment),high temperature+EBR(0.6 mg/L)treatment(He+EBR treatment).The effects of MT and EBR on photosynthetic performance parameters and fruit quality of Cabernet Sauvignon grape were measured and analyzed.The correlation between fructose and anthocyanins was also analyzed.[Re-sult]H treatment reduced the content of photosynthetic pigments,H+MT and H+EBR treatments were effective in mitiga-ting the damage caused by high temperature to chlorophyll a,chlorophyll b and carotenoids.91 d after anthesis,compared to H treatment,leaf chlorophyll a significantly increased by 41.73％in H+MT treatment(P＜0.05,the same below),at the same time,the net photosynthetic rate(Pn)significantly increased by 18.98％,Pn increased by 8.76％in H+EBR treatment.115 d after anthesis,compared to H treatment,transpiration rate(Tr)significantly increased by 23.68％in H+MT treatment,the reducing sugar content significantly increased by 11.82％.During the fruit harvesting period,H+MT treatment significantly mitigated the effect of high temperature stress on soluble solids,total soluble sugar,anthocyanin,total phenols and tannin contents.67 d after anthesis,the anthocyanin content of grape leaves significantly increased by 64.91％in H+MT treatment and 36.39％in H+EBR treatment,significant positive correlation between fruit sugar frac-tions and anthocyanosides was observed.[Conclusion]Spraying MT and EBR at high temperature can alleviate the effects of high temperature on leaf photosynthetic performance and fruit quality,the effects of H+MT treatment were fine.
万方数据
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