Faculty of Agriculture, Department of Horticulture, University of Tabriz, Tabriz, Iran.
Faculty of Agriculture, Department of Horticulture, University of Kurdistan, Sanandaj, Iran.
J Sci Food Agric. 2018 Dec;98(15):5632-5638. doi: 10.1002/jsfa.9107. Epub 2018 Jun 22.
The physiological and metabolic processes involved with grapevine growth and production are influenced by key macro- and micronutrients. Potassium is an essential plant nutrient that affects growth and fruit quality. In this study, the impact of foliar spraying of potassium sulfate (K SO ) on qualitative characteristics of grape berries was evaluated in the cultivar 'Rasha', a commonly cultivated cultivar in Kurdistan province of Iran. Leaves of the fully grown vines were sprayed with each of the 1.5 and 3 g L K SO solutions once (1 month after petal senescence) and twice (15 days after first spraying). The control plants were sprayed with distilled water. Various biochemical contents and enzyme activities on the ripe berries were analyzed.
Significant increases in anthocyanin, total protein content, and antioxidant enzyme activities were observed in the berries treated twice with 3 g L K SO . Concentrations of total carbohydrate, phenol, and antioxidant activity in berries sprayed with K SO were higher than in the controls. We observed a strong correlation between antioxidant activity and different phenolic compounds.
These findings suggest that K SO treatment influences biosynthesis of phenolic compounds and antioxidant enzymes. Thus, treatment by K SO could improve nutritional and qualitative attributes of grape. © 2018 Society of Chemical Industry.
葡萄生长和生产所涉及的生理和代谢过程受关键的大量元素和微量元素的影响。钾是一种植物必需的营养元素，它影响着生长和果实品质。在本研究中，评估了叶面喷施硫酸钾（K2SO4）对伊朗库尔德斯坦省广泛种植的品种“Rasha”葡萄浆果品质特性的影响。当叶片完全生长后，用 1.5 和 3 g/L 的 K2SO4 溶液各处理一次（落花后 1 个月）和两次（第一次处理后 15 天）。对照植株用蒸馏水喷雾。分析了成熟浆果上的各种生化含量和酶活性。
用 3 g/L K2SO4 处理两次的浆果中，花青苷、总蛋白含量和抗氧化酶活性显著增加。用 K2SO4 喷雾的浆果中总碳水化合物、酚类和抗氧化活性的浓度高于对照。我们观察到抗氧化活性与不同酚类化合物之间存在很强的相关性。
这些发现表明，K2SO4 处理影响酚类化合物和抗氧化酶的生物合成。因此，K2SO4 的处理可以改善葡萄的营养和品质特性。© 2018 化学工业协会。
