Effect of Potassium Silicate, Glycine Betaine and Proline on Fruit Quality of Peaches in Newly Reclaimed Land Exposed to Heat Stress

Abstract

The current study was performed on a 6-year-old "Florida" peach cultivar (Prunus persica) during 2022 and 2023 respectively. Twenty-four peach trees uniformly were selected and sprayed two times at the beginning of pit starts hardening and at the end of phase two of fruit growth with the following treatments: the control, glycine betaine at 400 mg l-1, potassium silicate at 200 mg l-1, potassium silicate at 400 mg l-1, potassium silicate at 200 mg l-1 + glycine betaine at 400 mg l-1, potassium silicate at 400 mg l-1 + glycine betaine at 400 mg l-1, proline at 400 mg l-1 and potassium silicate at 200 mg l-1 + proline at 400 mg l-1. The results indicated that both treatments of potassium silicate at 200 mg l-1 + proline at 400 mg l-1 and potassium silicate at 400 mg l-1 + glycine betaine at 400 mg l-1 resulted in a significant increase in concentrations of anthocyanin and total carotenoid contents in the skin. Moreover, total soluble solid, vitamin C and total soluble solid / acidity were shown with high concentrations as compared with the control. Overall, the use of potassium silicate at 200 mg l-1 + proline at 400 mg l-1 or potassium silicate at 400 mg l-1 + glycine betaine at 400 mg l-1 two times is recommended.