| 朱志明,许兴,毛桂莲.不同玉米自交系幼苗对水分胁迫的响应及其耐旱性评价[J].干旱地区农业研究,2018,36(2):176~185 |
| 不同玉米自交系幼苗对水分胁迫的响应及其耐旱性评价 |
| Response of different maize inbred lines seedlings to water stress and Drought tolerance evaluation |
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| DOI：10.7606/j.issn.1000-7601.2018.02.26 |
| 中文关键词: 水分胁迫 玉米自交系 幼苗 生长发育 生理特性 耐旱性 |
| 英文关键词:water stress maize inbred line seedling growth and development physiological characteristics drought tolerance |
| 基金项目:宁夏回族自治区牧草育种专项(2014NYYZ040101) |
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| 中文摘要: |
| 以9份玉米自交系为试材，采用盆栽试验方法进行苗期的水分胁迫试验，研究土壤水分胁迫对玉米自交系的生长发育及生理特性的影响，并采用多元分析方法对玉米自交系的耐旱性做出了综合评价。结果表明：水分胁迫下，玉米自交系幼苗通过外部形态及内部生理生化变化来响应干旱对其伤害，且耐旱性强的材料变化幅度小于耐旱性差的材料。通过主成分分析将干旱胁迫下玉米幼苗的6个单项指标转化为3个彼此独立的综合指标，并计算得到综合评价D值，比较准确地对玉米自交系材料的耐旱性做出了评价；利用聚类分析将9份玉米自交系材料分为耐旱性不同的四类，即干旱敏感型、弱耐旱材料、中度耐旱材料、高度耐旱材料四类。利用逐步回归的分析方法建立了玉米耐旱性评价回归方程：D=-0.107746+0.35003UWC+1.67684WUE-0.05857REC-0.1699Pro,筛选出适宜干旱胁迫下玉米耐旱性鉴定指标4个，即地下部含水量、水分利用效率、相对电导率、脯氨酸含量。在相同的逆境胁迫下可通过测定其它玉米品种上述4个指标的耐旱系数，利用回归方程进行耐旱性预测；材料8-8-1、KH207 A27-4-2的耐旱性较强，可以在后续试验中进行抗旱育种及栽培研究。 |
| 英文摘要: |
| 9 maize inbred lines were used as materials to study the effects of soil water stress on the growth and physiological characteristics of Maize Inbred Lines. The drought tolerance of maize inbred lines was evaluated by multivariate analysis. The results showed that: Under water stress, maize inbred lines seedlings responded to drought by external morphology and internal physiological and biochemical changes. And the change of material with strong drought tolerance was less than that of drought tolerance. Principal component analysis (PCA) was used to transform the 6 individual indexes of Maize Seedlings under drought stress into 3 independent indexes. The drought tolerance of maize inbred lines was evaluated. 9 maize inbred lines were divided into three types of drought tolerance, which were drought sensitive, weak drought tolerance, moderate drought tolerance and drought tolerance by using cluster analysis. The regression equation of drought tolerance of maize was established by stepwise regression analysis=-0.107746+0.35003UWC+1.67684WUE-0.05857REC-0.1699Pro, 4 indexes of drought tolerance of Maize under drought stress were selected, namely, water content, water use efficiency, relative electric conductivity, proline content. Under the same adversity stress, the drought tolerance of 4 maize varieties was determined by using the regression equation. Material 8-8-1, KH207 A27-4-2 has strong drought tolerance, and can be used in drought resistance breeding and cultivation. |
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