淹水胁迫下玉米自交系苗期的形态生理差异

以35份适应长江中下游种植的玉米自交系为材料,研究了淹水胁迫对玉米苗期生长的影响,评价了玉米自交系苗期耐涝性差异。结果表明：淹水胁迫对玉米形态和生理指标有显著影响。主成分分析表明：叶绿素含量（SPAD）、叶面积、株高、根干物重、茎干物重、叶干物重和总干物重的耐涝指数在4个主成分中占比重较大;总干物重、叶干物重、茎干物重、根干物重和叶面积的耐涝指数可以作为耐涝基因型筛选的指标。采用聚类分析将35份玉米自交系分为3类,其中敏感型17个、中间型6个和耐涝型12个。

Morphological and Physiological Differences of Maize Inbred Lines at Seedling Stage under Waterlogging Stress

To investigate the effects of waterlogging during seedling stage on morphology and physiology and to evaluate the genotypic differences, thirty-five maize inbred lines were used. The results showed that morphological and physiological traits were significantly affected by waterlogging stress. Principle component analysis indicated that SPAD, leaf area, plant height, root biomass, stem biomass, leaf biomass and total biomass had more proportion. The waterlogging tolerance indexes of total biomass, leaf biomass, stem biomass, root biomass and leaf area could be used for screening superior genotypes. The thirty-five maize inbred lines were classified into three groups as sensitive (seventeen inbred lines), mean type (six inbred lines) and tolerant (twelve inbred lines).