Effects of Potassium Fulvic Acid on Photosynthetic Characteristics and Fruit Quality of'Cabernet Gernischt'Grape
In order to investigate the effects of fulvic acid potassium(FA-K)on photosynthesis of grape leaves and fruit quality.In this experiment,the wine grape'Cabernet Gernischt'was used as the test material,and different concentrations(30,60,90,120 mg·L-1)of FA-K were sprayed on the leaves at flowering stage,fruit setting stage,expansion stage and color turning stage,and spraying water was used as the control.The photosynthetic pigment content,photosynthetic parameters,chlorophyll fluorescence parameters and fruit quality were measured under different treatments.The results showed that FA-K treatment significantly increased the content of chlorophyll a,chlorophyll b,total chlorophyll and carotene in leaves of'Cabernet Gernischt'at different growth stages,enhanced Pn,Tr,Gs,Fv/Fm,Y(11),qP,qN and ETR,and reduced Ci and Y(NPQ).The effect of 90 mg·L-1 FA-K treatment was the most significant.At the same time,FA-K also had a certain effect on improving fruit quality.In particular,90 mg·L-1 treatment significantly promoted the accumulation of total soluble sugar,soluble solids,tannins,total phenols,flavonoids and anthocyanins in fruit,which increased by 25.96％,13.81％,27.73％,63.89％,9.48％and 78.57％,respectively,compared with the control,while the relative content of titratable acid was only 0.54％,which was 26.03％lower than that of the control.Principal component analysis results showed that the effects of different concentrations of FA-K on the photosynthetic and fruit quality of'Cabernet Gernischt'grape leaves were as follows:90 mg·L-1 treatment＞60 mg·L-1 treatment＞120 mg·L-1 treatment＞30 mg·L-1 treatment＞the control.In summary,FA-K treatment can significantly enhance the photosynthesis of grape leaves and improve fruit quality,and the effect of 90 mg·L-1 is the most significant.
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