光强因子对甜糯玉米生长发育和产量的影响

以鲜食型糯玉米香白糯和超甜玉米粤甜3号为材料,采用人工遮光的方法,研究了光强因子对这2种不同基因型鲜食玉米生长发育和产量的影响。结果表明:40%全光照与100%全光照相比,香白糯和粤甜3号的抽雄、吐丝期分别推迟了7 d和8 d,收获期均推迟了11 d;遮光还使香白糯植株高度显著减少;香白糯果穗的穗长、行粒数、裸穗鲜重、百粒鲜重和百粒干重分别减少了48.9%、59.2%、46.6%、13.8%和22.8%,鲜穗产量减少了72.4%;粤甜3号果穗的穗长、行粒数、裸穗鲜重、百粒鲜重和百粒干重分别减少了43.3%、59.6%、48.3%、9.6%和17.9%,鲜穗产量减少了54.3%。

Effect of Light Intensity Factor on Growth and Yield of Sweet and Waxy Maize

Effect of light intensity factors on growth and yield of two genotypes of maize(Xiangbainuo and Yuetian 3) were studied,which were planted by artificial shading.These two genotypes of maize were raised under three light regimes(100 % sunlight,80 % sunlight,and 40 % sunlight) during their whole life time.Leaf photosynthetic pigment contents were detected.A series of agronomic traits and yield components were also studied.The result showed that shading delayed the growth of both Xiangbainuo and Yuetian 3.The tassel date of Xiangbainuo and Yuetian 3 was postponed by 7d and 8d,respectively.And harvest date was both postponed by 11d.Plant height of Xiangbainuo was significantly lower by shading,and plant height of Yuetian 3 had no significant difference under different light regimes.Ear length,kernels per row,weight per ear,fresh weight and dry weight per hundred kernel,yield of Xiangbainuo under 40 % sunlight decreased by 48.9 %,59.2 %,46.6 %,13.8 %,22.8 %,72.4 %,those of Yuetian 3 increased by 43.3 %,59.6 %,48.3 %,9.6 %,17.9 %,54.3 %,compared with 100 % sunlight.