应用^(32)P和~3H示踪研究不同玉米自交系的抗旱特性  

EVALUATION OF MAIZE DROUGHT RESISTANCE WITH RADIOACTIVITY ASSESSMENTS

作　　者：袁佐清 张怀渝[1] 李晚忱[2] 陈志渝[1] 杨天政[1] 王化新[1] 

机构地区：[1]四川农业大学生命科学院 [2]四川农业大学玉米研究所,四川雅安625014

出　　处：《核农学报》2004年第6期468-473,共6页Journal of Nuclear Agricultural Sciences

摘　　要：本研究以遮雨塑料棚控制灌水量及室内聚乙二醇 (PEG)模拟土壤干旱胁迫 ,利用示踪技术研究干旱胁迫下不同玉米自交系根系在苗期和生育中期对3 H、3 2 P的吸收特性 ,结果表明 ,在干旱胁迫下 ,玉米在苗期和大喇叭口时期对3 2 P和3 H的吸收均较对照有明显下降 ;抗旱性强的自交系下降幅度小 ,抗旱性弱的自交系下降幅度大。在所测的 1 0项指标中 ,苗期地上部3 H和3 2 P比活度 (PEG处理 )、苗期地上部3 2 P总活度 (盆栽 )、中期地上部3 2 P比活度 (盆栽 )与抗旱系数呈显著相关 ;苗期地上部3 H和3 2 P总活度 (PEG处理 )、中期地上部3 2 P总活度与抗旱系数呈极显著正相关。通过对各指标的敏感指数与抗旱系数的相关分析表明 ,苗期室内PEG模拟干旱条件下植株对3 2 P、3 H的吸收值可作为早期鉴定玉米抗旱性强弱的一个重要指标。maize inbred lines with different capabilities in drought resistance were evaluated for phosphate and H 2O assimilations and their relationships to drought resistance under water-stressed with tracer of 32P and 3H. The results show that the assimilated 32P and 3H declined significantly under water-stress in comparison with the control. The amounts of assimilated 32P and 3H were different among the lines with a trend of less decrease in the drought-resistant lines. The differences may be used as one of the indexes for identifying drought resistibility. Assimilations of 32P and 3H at the seedling stage (PEG induced) were the most indexes for evaluation of maize drought resistance; The maize drought resistance could be identified effectively at the seedling stage with tracer of 32P and 3H. A new effective early indoor method for evaluation of maize drought resistance was put forward.

关 键 词：地上部 苗期 抗旱系数 抗旱性 玉米自交系 PEG处理 干旱胁迫 ^32P 中期 比活度 

分 类 号：S513[农业科学—作物学] S511