中国农业大学学报2024，Vol.29Issue(3)：99-112,14.DOI:10.11841/j.issn.1007-4333.2024.03.09
根施甜菜碱对甜瓜幼苗在NaCl胁迫下的缓解效应
Alleviating effect of root application of betaine on muskmelon seedlings under NaCl stress
摘要
Abstract
In order to explore the relationship between betaine root application and regulating leaf photosynthesis,antioxidant capacity and osmotic regulation,and the feasibility of enhancing salt tolerance of melon seedlings,'Xizhoumi 25'melon seedlings were used as study materials.Muskmelon seedlings were pretreated with betaine(5,10,20 and 40 mmol/L)for 3 days,and then treated with NaCl stress(75 and 150 mmol/L)for 7 days.The root activity,relative permeability of cell membrane,photosynthetic pigment,photosynthetic physiology,osmotic adjustment substance and antioxidant enzyme activity of muskmelon seedlings were determined.The results showed that:1)Compared with the control group,different concentrations of NaCl had a significant impact on various physiological indicators of melon seedlings(P＜0.05).2)Root application of betaine pretreatment had a certain alleviating effect on NaCl stress.Betaine with a concentration of 5-10 mmol/L can improve the content of photosynthetic pigment,photosynthetic capacity and antioxidant enzyme activity in the leaves of melon seedlings to varying degrees,with the best mitigation effect.3)The root activity and photosynthetic characteristic parameters of melon seedlings pretreated with 5-10 mmol/L betaine were lower under 150 mmol/L NaCl stress than under 75 mmol/L NaCl stress,indicating that root application of betaine had a better effect in alleviating low concentration NaCl stress.In conclusion,exogenous root application of betaine can effectively alleviate the salt injury to muskmelon seedlings by regulating various physiological and biochemical mechanisms,enabling them to resisit NaCl stress.The best mitigation effect was at the concentration of 5-10 mmol/L.关键词
甜瓜/甜菜碱/NaCl胁迫/光合作用/渗透调节/抗氧化酶活性Key words
muskmelon/betaine/NaCl stress/photosynthesis/osmoregulation/antioxidant enzyme activity分类
农业科技引用本文复制引用
蒋艳,古丽孜叶·哈力克,秦倩,艾力江·麦麦提..根施甜菜碱对甜瓜幼苗在NaCl胁迫下的缓解效应[J].中国农业大学学报,2024,29(3):99-112,14.基金项目
新疆维吾尔自治区人力资源与社会保障厅高层次人才引进工程项目(2017-2020) （2017-2020）
自治区自然科学基金计划——特培项目(2019D03016) （2019D03016）
新疆维吾尔自治区"天山创新团队计划"项目(2021D14009) （2021D14009）
