Effects of coronatine on coloration and quality of "Flame Seedless" grape berry
[Objective]To study the effects of coronatine(COR),a new plant growth regulator,on the coloration and quality of"Flame Seedless"grape berry,in order to screen out the optimal treatment concentration of COR,and to explore the effects of COR on the coloration and quality of grape berry,so as to provide theoretical basis and technical reference for the production and application of COR and grape production.[Method]Taking the excellent early-maturing grape variety"Flame Seedless"grape as the test material,three COR dipping concentration treatments were set up at the initial stage of fruit color conversion,and six samplings were taken from the treatment to the mature period.The berry mass,longitudinal diameter,transverse diameter,pedicel endurable pulling force,firmness,total soluble solids,total acid,fruit color parameters,anthocyanin,chlorophyll,carotene,carotenoid and phenolic compounds were continuously measured.The optimal treatment concentration of COR was determined by comprehensive analysis.[Result]Different concentrations of COR could significantly increase berry mass,total soluble solid content,reduce total acid content,increase TSS/TA,and improve fruit quality.Among them,COR 2000 times treatment had the best comprehensive quality.Compared with the control,total soluble solid content increased by 8.43%,total acid content decreased by 26.19%,TSS/TA increased by 46.31%,anthocyanin content increased by 1.53 times,chlorophyll content decreased by 18.18%,a*value increased by 1.01 times,CIRG value increased by 38.04%,and h° value decreased by 67.13%.COR 3000 times treatment promoted the best coloring effect.Compared with the control,anthocyanin content increased by 1.61 times,chlorophyll content decreased by 27.27%,carotene content decreased by 20%,a* value increased by 1.24 times,CIRG value increased by 52.17%,and h° value decreased by 82.78%.[Conclusion]Different concentrations of COR could improve the quality of"Flame Seedless"grape berry and promote fruit coloring.Among them,COR 2000 times treatment had the best effect on improvement of fruit quality.In terms of promoting fruit coloring,COR 3000 times treatment had the best effect.
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