Effects Of Brown Sugar Enzyme And Potassium Fulvic Acid On Salt Tolerance And Fruit Quality Of Peach

Peach,as a major deciduous fruit tree in the north,is of great significance and plays a driving role in promoting farmers’ income growth.However,due to excessive fertilization in traditional peach orchards,the problem of soil salinization is severe.Peaches have poor salt tolerance and salt stress has a significant impact on the normal growth of peach trees.Therefore,taking appropriate measures to improve the salt tolerance of peaches is of great significance for the development and utilization of saline alkali soil.Previous studies have shown that the application of brown sugar enzyme or potassium fulvic acid can enhance plant salt tolerance and play a certain role in improving fruit quality.However,there are few reports on whether the mixed application of brown sugar enzyme and potassium fulvic acid can more effectively alleviate salt stress in peach seedlings and improve fruit quality.Therefore,this study used peach seedlings and 5-year-old mature peach tree ’Xiahui No.8’ as test materials to investigate the effects of brown sugar enzyme and potassium fulvic acid on salt resistance and fruit quality of peach seedlings,providing theoretical basis and technical reference for reducing salt stress damage during peach cultivation.The main test results are as follows:1.The mixed application of brown sugar enzyme and potassium fulvic acid can significantly improve the salt tolerance of peach seedlings.Under non salt stress,compared with the control,the mixed application of brown sugar enzyme and potassium fulvic acid increased the chlorophyll,root activity,soluble sugar,and soluble protein content of peach seedlings by 9.3%,17.3%,9.5%,and 25.7%,respectively,with significant differences;Under salt stress conditions,compared with the control S-CK,the application of brown sugar enzyme and potassium fulvic acid increased the chlorophyll,root activity,soluble sugar,and soluble protein content of peach seedlings by 9.2%,21.5%,22.0%,and 23.4%,respectively;The mixed application also significantly increased the proline content and peroxidase activity,which increased by 26.6% and 21.7% respectively compared to the control S-CK,and decreased the MDA content by 23.8%,with significant differences.Moreover,under non salt stress conditions,the relative expression levels of the Pp NHX1-Pp NHX7 coding gene were increased at all time periods under T1,FA,and T1 FA treatments.Among them,the relative expression levels of T1 and T1 FA treatments showed particularly significant changes.On this basis,salt stress treatment was further carried out on peach seedlings,and it was found that S-T1 FA treatment can better induce the expression of Pp NHXs genes.2.Spraying brown sugar enzyme alone or mixed with brown sugar enzyme and potassium fulvic acid on the leaves can significantly improve the fruit quality of peaches.Compared with the control,spraying brown sugar enzyme alone or mixing enzyme with potassium fulvic acid significantly increased the single fruit weight,soluble sugar,soluble solids,and soluble protein content of the fruit.Compared with the control,the single fruit weight,soluble sugar,soluble solids,and soluble protein content of peach fruit sprayed with brown sugar enzyme increased by 39.7%,30.6%,16.7%,and 36.6%,respectively;The single fruit weight,soluble sugar,soluble solids,and soluble protein content of peach fruits sprayed with potassium fulvic acid increased by 23.2%,18.9%,10.1%,and 16.5%,respectively;The single fruit weight,soluble sugar,soluble solids,and soluble protein content of the mixed application of the two fruits increased by 36.8%,31.0%,15.3%,and 36.9%,respectively,with significant differences.