关键词: 枇杷, 水分胁迫, 生理指标

Abstract: Using the grafted seedlings of two loquat varieties (Changhong No.3 and Jiefangzhong) as experimental materials, the effects of water stress on physiological determinations in loquat leaves were studied. With the increase of water stress, the content of proline in loquat leaves increased and the content of protein decreased. The activities of H⁺-ATPase in organelles of loquat leaves increased under light or moderate water stress. Under severe water stress, the activities of H⁺-ATPase in cytoplasm decreased greatly, being lower than those of the control, while the activities of H⁺-ATPase in mitochondria and chloroplast were still higher than those of the control. Under the same level of water stress, the decrements of protein in loquat leaves of Changhong No.3 was less than that of Jiefangzhong, while the increments of H⁺-ATPase activities in mitochondria and chloroplast were higher than those in Jiefangzhong. These showed that Changhong No.3 was better than Jiefangzhong in the resistance to drought.

Key words: loquat, water stress, physiological determinations