唐古特白刺抗旱优良家系早期选择研究

Early selection of superior families with high drought resistance in Nitraria tangutorum

为选择抗旱优良的唐古特白刺家系,本实验于2015、2016年和2018年分别对来自兰州和武威试验点的31个唐古特白刺家系进行可溶性糖(SS)、可溶性蛋白(SP)、游离脯氨酸(Pro)、过氧化氢酶(CAT)、过氧化物酶(POD)、超氧化物歧化酶(SOD)以及叶绿素(Chl)含量测定,运用主成分分析法和隶属函数法对家系抗旱性进行综合评价选择出抗旱优良家系并进行对比分析。结果表明:运用2种综合评价方法结果重合率在80%以上,以20%入选率选择抗旱优良家系,2试验点的j3-9、jc-8、w3-15、w3-12等4个家系在2015年、2016年均入选,在2018年抗旱性明显优于其他家系,入选家系在不同年份不同试验点的抗旱性表现一致,说明唐古特白刺抗旱优良家系在不同生理阶段不同环境下抗旱性表现稳定,对其进行早期选择具有可靠性。

In order to choose a Nitraria tangutorum family with excellent drought-tolerance,in 2015,2016,and2018,the contents of soluble sugar,soluble protein,proline,catalase,peroxidase,superoxide dismutase,and chlorophyllwere determinedin 31 N.tangutorum families from two experimental sites(Lanzhou and Wuwei)with different natural conditions,respectively.Two comprehensive evaluation methods(comprehensive evaluation and comparison by principal component analysis and membership function)were used to obtain two results,and more than 80%of the two results were the same.If 20%is used as the selection rate to select excellent drought-resistant families,four families,j3-9,jc-8,w3-15,and w3-12,were selected in two consecutive years(2015 and 2016).Their drought resistance in 2018 is significantly better than that of unselected families.The drought resistance of the selected families was consistent at different experimental points in different years,which indicates that the drought resistance of the fine families of N.tangutorumis stable under different physiological conditions and in different environments and that the early selection of the fine families is reliable.