12个青贮玉米苗期抗旱性综合评价  

Comprehensive Evaluation of Drought Resistance in 12 Silage Maize Seedlings

作　　者：李丹宁 刘琪琪 万懿琦 李乐 梁政 王少利 王永俊 呼天明[1] 杨培志[1] 王亚芳[1] LI Dan-ning;LIU Qi-qi;WAN Yi-qi;LI Le;LIANG Zheng;WANG Shao-li;WANG Yong-jun;HU Tian-ming;YANG Pei-zhi;WANG Ya-fang(College of Grassland agriculture/Northwest A&F University,Yangling 712100,China;Shaanxi Datang Seed Industry Limited Company,Yangling 712100,China)

机构地区：[1]西北农林科技大学草业与草原学院,陕西杨凌712100 [2]陕西大唐种业股份有限公司,陕西杨凌712100

出　　处：《山东农业大学学报（自然科学版）》2024年第1期23-30,共8页Journal of Shandong Agricultural University：Natural Science Edition

基　　金：陕西省重点研发项目(2022NY-093);国家自然科学基金青年项目(32101441)。

摘　　要：本研究以12个青贮玉米品种为供试材料,通过盆栽试验,在苗期采用限制灌溉方式进行干旱处理,测定干旱胁迫下不同玉米品种叶片相对含水量、株高、地上部分干重、根冠比、抗氧化酶活性等与抗旱性相关的表型性状和生理生化指标。首先计算各品种10个指标的抗旱系数,随后结合隶属函数法和主成分分析,对不同品种青贮玉米苗期抗旱性进行综合评价,筛选抗旱性强的青贮玉米品种,为旱区青贮玉米生产提供材料和理论依据。研究结果表明,干旱胁迫下,12个不同青贮玉米品种叶片相对含水量、株高、茎粗、地上部分干重、地下部分干重等指标均有所下降,过氧化物酶、超氧化物歧化酶、过氧化氢酶、丙二醛和根冠比则不同程度升高,且不同品种间各指标下降或增加的幅度有很大差异;隶属函数分析结果显示抗旱性强的品种为正饲玉2号、宁玉688和禾玉36,D值分别为0.498、0.478和0.464;主成分结合聚类分析结果显示抗旱性强的品种为正饲玉2号、禾玉36和大唐8号,Y值分别为1.06、1.04和0.88。综合2种评价方法,正饲玉2号和禾玉36属于抗旱性强的品种。Through the pot experiment,we used restricted irrigation in the seedling stage,and determined the phenotypic traits and physiological and biochemical indexes related to drought resistance,such as leaf relative water content,plant height,aboveground dry weight,root crown ratio,antioxidant enzyme activity of different maize varieties under drought stress with the 12 silage maize varieties as experimental materials.Firstly,we calculated the drought resistance coefficient of 10 indexes of each variety,then,evaluated the drought resistance of different varieties of silage corn at the seedling stage,and screened the silage maize varieties with strong drought resistance to provide material and theoretical basis for silage maize production in arid areas.The research results indicate under drought stress leaf,relative water content,plant height,stem diameter,above-ground dry weight and underground dry weight of 12 different silage maize varieties decreased,while peroxidase,superoxide dismutase,catalase,malondialdehyde and root-shoot ratio increased to varying degrees,there was a great difference in the decrease or increase of each index among varieties.The results of membership function analysis showed Zhengsiyu 2,Ningyu 688 and Heyu 36 had strong drought resistance with D values of 0.498,0.478 and 0.464 respectively.The results of principal component analysis combined with cluster analysis showed that Zhengsiyu 2,Heyu 36,and Datang 8 had strong drought resistance with Y values of 1.06,1.04,and 0.88,respectively.According to the above evaluation methods,zhengsiyu 2 and Heyu 36 are strong drought resistant varieties.

关 键 词：青贮玉米 苗期 抗旱性 隶属函数法 主成分分析 

分 类 号：S513[农业科学—作物学]