Excess heat has a negative effect on the growth and development of fruit plants, their productivity, so the success of introduction under conditions with a hot climate is determined by the plants resistance to overheating. The article presents for the first time the results of the heat resistance study of 10 introduced apple-tree varieties in seasonal dynamics due to their water content, transpiration rate and seasonal development. It was found that the heat resistance varied in different varieties and changed during the growth, decreasing in August-September in all varieties. Maximum values of water content in the leaves was observed in May and minimum in August-September. The maximum transpiration rate was from June to August, depending on variety. High heat resistance, water content and low transpiration rate were observed in all varieties at the end of May, against the background of a drop in the growth rate of shoots. At the completion time of shoot growth and the beginning of fruit ripening, the water content decreased in all varieties, transpiration rate varied in different directions, and heat resistance decreased in all varieties except the most stable ones (Stolovka, Renet Burkhardta). After fruit ripening and shoots lignification, water content, transpiration rate and heat resistance decreased in all varieties. The most productive varieties were characterized by high heat resistance.
The work was carried out on the topic of the Grant Project “Introduction of prospective apple-tree varieties for introduction into culture in the arid regions of West Kazakhstan”.

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