玉米自交系耐荫性鉴定与评价

以41个玉米自交系为材料,采用大田试验方法,在植株形态建成期设置15%遮荫和不遮荫两种处理方式,研究不同处理下玉米自交系植株形态、物质生产、产量等11个指标以及各指标耐荫系数的变化,并对自交系的耐荫性进行评价。结果表明,遮荫不仅会增加玉米自交系的株高和穗位高,延缓生育进程,而且会降低植株叶面积指数及叶绿素含量,最终影响玉米物质积累及产量的提升。进一步对各指标的耐荫性进行数学统计分析,表明茎干物质、叶面积指数和产量的耐荫系数可作为评价玉米自交系耐荫性指标。筛选出M173、豫82、DH382、618B、P6874、昌7-2、8612A、M753、ZY608、豫1122、PH6WC和M109高度耐荫型玉米自交系;ZY602、ZY606、658、HT60、ZY601、C70、外引-2、四-144、KW7M14、NS501和PH4CV是弱光敏感型玉米自交系。

Identification and Evaluation of Shade-tolerance to Maize Inbred Line

Used the filed experimental method, through 41 maize inbred lines as the test materials under shade (15% of ambient sunlight) and control (no shade) in plant morphogenesis stage. Systematic research plant morphology, material production, yield, etc.11 plant morphology and physical indexes of shade-tolerance index changing rule, cluster analysis in maize silk stage and shade tolerance of inbred lines were evaluated by changing rule. The results showed that shading treatment increased plant height, ear height, delay the growth period and decreased leaf area index(LAI), SPAD value, ultimately affect the material accumulation and yield of maize inbred line. The shade tolerance of each index was further analyzed by mathematical statistics. The results showed that stem dry matter, leaf area index and yield could be used as indexes to evaluate shade tolerance of maize inbred lines. Screen out highly shade tolerance M173, Yu82, DH382, 618B, P6874, Chang7-2, 8612A, M753, ZY608, Yu1122, PH6WC, M109 and shade sensitive ZY602, ZY606, 658, HT60, ZY601, C70, Waiyin-2, Si-144, KW7M14, NS501, PH4CV maize inbred lines.