玉米不同生育时期抗旱鉴定指标的研究

A Study on Drought Resistant Identification During Different Growing Stages of Maze

用离体叶片的相对含水量，相对电导率，气孔扩散阻力，蒸腾强度，硝酸还原酶活性，游离脯氨酸含量及株高，叶面积系数，抗旱指数对６个玉米品种的不同生育时期的抗旱性进行了初步研究，通过相关分析及显著性测验得出，玉米在其一生中，大喇叭口期是抗旱性鉴定的关键时期，相对电导率、相对含水量、蒸腾强度和气孔扩散阻力可作为全生育期抗旱鉴定的重要指标、株高、叶面积系数，硝酸还原酶活性可作为中期鉴定指标，游离脯氨酸含量可作为中、后期的鉴定指标。

Preliminary Studies o drought resistance of six maize Varieties during differ-ent growing stages were made.The result showed that malle tetrall stage is the keystage for drought resistance appraisal.Membrane permeability,relative water coutent,transpiration strength and pore diffusion resistance can be considered as key indexes fordrought resistance appraisal in whole growing stase.growing plant height leaf area index. nitrate reduetase activity can be considered as in Cexes for drougnt resistance ap-praisal in mid-groning stage,the content of free proline can be used as index in midclleand later growing stages.