PEG模拟干旱胁迫对香蕉幼苗生长及生理特性的影响  

Effects of PEG simulation of drought stress on the growth and physiological characteristics of banana seedlings

作　　者：魏军亚[1] 杨萍 刘涛 赵增贤[1] 程世敏 魏守兴[1] 刘德兵 Wei Junya;Yang Ping;Liu Tao;Zhao Zengxian;Cheng Shimin;Wei Shouxing;Liu Debing(Tropical Crops Genetic Resources Institute,Chinese Academy of Tropical Agricultural Sciences/National Tropical Fruit Improvement Center/Key Laboratory of Crop Genetic Resources and Germplasm Creation in South China,Ministry of Agriculture and Rural Affairs/Key Laboratory of Genetic Improvement and Innovation of Tropical Crop Resources of Hainan Province,Haikou 571101;School of Design,Hainan Vocational University of Science and Technology;College of Tropical Agriculture and Forestry,Hainan University)

机构地区：[1]中国热带农业科学院热带作物品种资源研究所,国家热带果树品种改良中心,农业农村部华南作物基因资源与种质创制重点实验室,海南省热带作物资源遗传改良与创新重点实验室,海口571101 [2]海南科技职业大学设计学院 [3]海南大学热带农林学院

出　　处：《中国果树》2025年第2期69-75,共7页China Fruits

基　　金：海南省科技项目(ZDYF2022XDNY196、ZDYF2023XDNY068);财政部和农业农村部:国家现代农业(香蕉)产业技术体系(CARS-31)。

摘　　要：为研究干旱胁迫对香蕉幼苗生长及生理特性的影响,使用PEG-6000模拟土壤干旱对香蕉幼苗进行干旱胁迫处理,测定不同浓度PEG-6000(5%、10%、15%)模拟干旱胁迫对香蕉幼苗生长状态、叶片相对含水量、叶片相对电导率和脯氨酸、可溶性蛋白、MDA含量,以及抗氧化酶活性和根系活力的影响。结果表明:随着PEG-6000模拟干旱胁迫浓度的增加,香蕉幼苗叶片逐渐枯萎发黄,长势下降;叶片相对含水量和根系活力均逐渐降低;叶片相对电导率和脯氨酸、MDA含量及POD活性均逐渐升高;可溶性蛋白含量和SOD、CAT活性均表现为先升高后降低的趋势,且均在10%PEG-6000浓度处理下达到最大值。表明香蕉幼苗在5%PEG-6000和10%PEG-6000浓度的干旱胁迫时,可通过自身的调节以及抗氧化酶保护系统等减轻干旱带来的伤害。To study the effects of drought stress on the growth and physiological characteristics of banana seedlings,PEG-6000 were used to simulate soil drought and treat banana seedlings under drought stress.The effects of different concentrations of PEG-6000(5%,10%,15%)simulated drought stress on the growth status,leaf relative water content,leaf relative conductivity,and the content of proline,soluble protein,MDA,and antioxidant enzyme activity,and root activity of banana seedlings were measured.The results showed that as the simulated drought stress concentration of PEG-6000 increased,the leaves of banana seedlings gradually withered and turned yellow,and their growth declined;the leaf relative water content and root vitality gradually decreased;the leaf relative conductivity,the content of proline and MDA,and POD activity gradually increased;the soluble protein content and the activities of SOD and CAT showed a trend of first increasing and then decreasing,and both reached their maximum values under the treatment of 10%PEG-6000 concentration.This indicated that banana seedlings can alleviate the damage caused by drought through their own regulation and antioxidant enzyme protection system under 5%and 10%PEG-6000 concentration drought stress.

关 键 词：香蕉 干旱胁迫 生理生化指标 PEG-6000 

分 类 号：S668.1[农业科学—果树学]