不同玉米品种的耐阴性比较

Comparison of Shade Tolerance of Different Maize Varieties

在开花期采用人工模拟50%遮阴,研究了遮阴条件下16个玉米品种在遮阴条件下的差异。结果表明:遮阴条件下穗长变短、穗粗变细、穗行数和行粒数减少、产量降低。以产量和行粒数的综合耐阴系数为指标对16个玉米品种进行耐阴性评价,分为耐阴性强和耐阴性弱2大类型,漯玉336、郑单958、登海605、阳光98、阳光99、先玉335、豫丰3358共7个玉米品种的耐阴性较强,而迪卡517、怀川39、金城12、北青340、迪卡653、豫禾588、泛玉98、晟玉21、创玉107共9个品种的耐阴性较弱。

50% shading was artificially simulated during flowering period,and the differences of 16 maize varieties under shading conditions were studied.The results showed that the length of panicle was shorter,the thickness of panicle was thinner,the number of panicles and grains per row was reduced,and the yield was reduced.Based on the comprehensive negative tolerance coefficient of yield and grain number,16 maize varieties were evaluated for negative tolerance,which was divided into 2 types:strong negative tolerance and weak negative tolerance.Among them,7 varieties,such as zhengdan 958 and Luoyu 336,had strong shade tolerance;while 9 varieties,such as Beiqing 340,had weak shade tolerance.