PEG模拟干旱对鲜食木薯华南9号幼苗生长的影响  

Effects of PEG simulated drought on the growth of fresh-eating Manihot esculenta Crantz SC9 seedlings

作　　者：段元杰 孟富宣[1] 杨玉皎 刘海刚[1] 黄洁[2] 魏云霞[2] DUAN Yuan-jie;MENG Fu-xuan;YANG Yu-jiao;LIU Hai-gang;HUANG Jie;WEI Yun-xia(Tropical Eco-Agricultural Research Institute,Yunnan Academy of Agricultural Sciences/Yuanmou Dry-Hot Valley Botanical Garden,Yuanmou 651300,Yunnan,China;Tropical Crops Genetic Resources Institute,Chinese Academy of Tropical Agricultural Sciences/Key Laboratory of Conservation and Utilization of Cassava Genetic Resources,Ministry of Agriculture and Rural Affairs,Danzhou 571737,Hainan,China)

机构地区：[1]云南省农业科学院热区生态农业研究所/元谋干热河谷植物园,云南元谋651300 [2]中国热带农业科学院热带作物品种资源研究所/农业农村部木薯种质资源保护与利用重点实验室,海南儋州571737

出　　处：《湖北农业科学》2020年第4期42-44,50,共4页Hubei Agricultural Sciences

基　　金：国家现代木薯产业技术体系建设专项(CARS-11-hnhj)。

摘　　要：以鲜食木薯(Manihot esculenta Crantz)华南9号(SC9)幼苗为材料,用不同浓度的PEG模拟干旱胁迫进行抗旱性研究。结果表明,随着PEG浓度提高,胁迫程度加剧,SC9幼苗叶片脱落数增多,株高增长量、冠面积、地上部分干重、叶片干重、支持结构干重、叶片面积、叶片鲜重逐渐减小,相对电导率逐渐上升,光合色素含量先增加后减小。在干旱胁迫下SC9幼苗通过改变生长状况和叶片生理功能来适应干旱环境,对干旱胁迫具有一定的耐受性。Seedlings of fresh-eating cassava Manihot esculenta Crantz variety South China 9(SC9) were used as materials,different concentrations of PEG were used to study drought resistance under simulated drought stress. The results showed that with the increase of PEG concentration, the drought stress increased, the number of leaf abscission increased, plant height growth, crown area, dry weight of aboveground part, dry weight of leaf, dry weight of supporting structure, leaf area, leaf area, leaf area of SC9 seedlings increased. The fresh weight of the slices decreased gradually, the relative conductivity increased gradually, and the content of photosynthetic pigments increased first and then decreased. That SC9 could adapt to drought environment by changing morphological characteristics, growth indicators and physiological functions of leaves under drought stress, and had good tolerance to drought stress.

关 键 词：鲜食木薯(Manihot esculenta Crantz)SC9 干旱胁迫 生长状况 生理指标 

分 类 号：S533[农业科学—作物学]