遮光对不同株型玉米品种农艺性状和果穗发育的影响

Effects of Shading on Agronomic Traits and Ear Development of Maize Cultivars(Zea mays) with Different Plant Types

以不同株型玉米品种为材料,在大田采用人工遮光处理,研究了弱光胁迫对不同株型玉米品种的农艺性状、穗部性状和产量的影响。结果表明,拔节至吐丝期遮光处理导致玉米生长发育迟缓,吐丝期株高、茎粗、叶面积等农艺性状和雌穗长、雌穗粗、雌穗鲜重等穗部性状均下降,可见花丝数减少;成熟期,穗部性状除千粒重增加,其余均降低。紧凑型品种浚单20对遮光的敏感性显著低于平展型品种豫玉22。

The effects of artificial shading on the agronomic traits and ear development ot two summer maize caltivars which possessed different plant types were studied in the field. The result showed that the growth and development of XD20 and YY22 were prolonged by the treatment of shading from 6 leaves stage to silking stage; at silking stage, the agronomic traits such as plant height, stem diameter and leaf area, and ear traits such as ear length, ear diameter, fresh ear weight and number of visible silks of two eultivars all decreased; at maturing stage, all ear traits were decreased except 1000 - kernel weight. The results of this study suggested that fiat - plant -type maize eultivar YY22 was more sensitive to shading than compact -plant -type cultivar XD20.