Journal of Henan Agricultural Sciences ›› 2021, Vol. 50 ›› Issue (1): 121-128.DOI: 10.15933/j.cnki.1004-3268.2021.01.015
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TIAN Jia,LI Jia,MENG Qingbo,LI Zhongyong,XU Jizhong
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田佳,李佳,孟清波,李中勇,徐继忠
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Abstract: In order to study the heat tolerance threshold and physiological and biochemical changes of leaves of different apple varieties,the new shoots of Orin,Fuji and Gala were used as the test materials under the artificial simulated high temperature environment.The time of symptom onset,heat injury rate and heat injury index were investigated,and changes in relevant physiological and biochemical indicators were measured.The main results showed that the heat tolerance threshold of the leaves of Orin,Fuji and Gala were 41,43 and 44℃ ,respectively. In the field,Orin leaves had the highest damage rate and damage index of 53.50% and 18.05,and Gala leaves had the lowest damage rate and damage index of 5.36% and 1.57,respectively.With the prolongation of high temperature,the chlorophyll contents of the three apple varieties showed a gradual decrease trend,the soluble protein content and the activities of superoxide dismutase and peroxidase showed a law of increasing first and then decreasing,and reached the peak value at 6 hours after high temperature stress.In summary,with the prolongation of high temperature stress, the photosynthetic pigments of apple leaves are degraded, the membrane peroxidation is aggravated,the antioxidant enzymes activity of apple leaves increase,and the physiological metabolism of apple leaves changes significantly.
Key words: Apple leaves, Threshold, High temperature, Heat damage, Physiological and biochemical response
摘要: 为研究不同苹果品种叶片耐热阈值及高温下生理生化变化,以王林、富士、嘎拉的新梢为试材,在人工模拟高温环境下,研究了热害症状出现的时间、热害率及热害指数,并分析了叶片相关生理生化指标变化。结果表明,王林、富士、嘎拉叶片的耐热阈值温度分别为41、43、44 ℃。田间王林叶片的受害率和受害指数最高,分别为53.50% 和 18.05,嘎拉叶片的受害率和受害指数最低,分别为5.36% 和 1.57。随高温时间的延长,3个苹果品种叶片叶绿素含量均表现出逐渐降低的趋势; O2-•、丙二醛含量和相对电导率则持续升高;可溶性蛋白含量和超氧化物歧化酶、过氧化物酶活性均呈现出先升高后降低的规律,且在高温胁迫6 h达到峰值。综合分析认为,阈值温度影响了3个苹果品种叶片的形态及正常的生理代谢,随着高温胁迫时间的延长,苹果叶片叶绿素降解,膜脂过氧化加重,抗氧化酶活性增加,苹果叶片的生理代谢变化明显。
关键词: 苹果叶片, 阈值, 高温, 热害, 生理生化响应
CLC Number:
S661.1
TIAN Jia, LI Jia, MENG Qingbo, LI Zhongyong, XU Jizhong. Heat Tolerance Threshold and Physiological and Biochemical Responses of Leaves of Different Apple Varieties[J]. Journal of Henan Agricultural Sciences, 2021, 50(1): 121-128.
田佳, 李佳, 孟清波, 李中勇, 徐继忠. 不同苹果品种叶片耐热阈值及高温下生理生化响应[J]. 河南农业科学, 2021, 50(1): 121-128.
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URL: https://www.hnnykx.org.cn/EN/10.15933/j.cnki.1004-3268.2021.01.015
https://www.hnnykx.org.cn/EN/Y2021/V50/I1/121