遮阴对春玉米物质生产及产量形成的影响

Effect of Shading on Dry Matter Accumulation and Yield of Maize

以4个不同玉米品种为试材,通过50%遮光处理研究玉米品种间物质生产及产量形成对弱光环境响应的差异。结果表明,供试品种遮阴后,玉米产量、穗长、行数、行粒数和总粒数均呈明显的降低趋势,且粒期遮阴胁迫反应敏感。孕穗期遮阴,生育进程加快,干物质日积累量减少;粒期遮阴,结穗率降低。遮阴对品种先玉335和郑单958产量影响相对较小,表明先玉335和郑单958对弱光的适应能力较强;东单90对弱光反应敏感,产量下降幅度较大;北育288对粒期遮阴较孕穗期遮阴敏感。

A pot experiment was conducted to evaluate the effects of 50% shading on dry matter accumalation, and yield of different varieties. The results showed that yield, ear length, rows per ear, kernels per row and total ker- nels decreased after shading and grain shading was more sensitive than ear shading. Ear shading, the fertility pro- cess accelerated and the dry matter reduced. Grain shading, ear rate decreased. The results indicated that abilities of high-density-tolerance maize Xianyu335 and Zhendan958 to adapt to shade-endurance were better and that of sparse sowing Dongdan90 was worse, the grain shading in Beiyu288 was more sensitive than ear shading.