光周期遗传特性对青饲玉米植株生长的影响

对华农1号青饲玉米组合的父、母本和F1、F2代杂交种以及2个对照品种共6个品系进行光周期敏感性测定,并在内蒙古自治区进行长日照盆栽试验,研究光周期对营养生长的影响.光周期敏感性测定试验结果表明:(1) 6个玉米类型存在显著光周期敏感性差异。以最终叶片数(TLN)变化为指标,可将6个玉米品系划分为光周期极敏感型、敏感型、相对敏感型、相对不敏感型等4个类型.(2)长在内蒙古自治区日照条件下,幼苗期(5叶龄),敏感型和相对敏感型的杂交F1、F2代品系在株高、茎粗、地上部干物质量方面指标都较低,收获期叶片较多,上述指标均显著上升;光周期相对不敏感型品种在幼苗期阶段的上述指标较高,收获期阶段显著降低;而光周期极敏感型品种在全生育期受长日照抑制,植株生长较慢.光周期敏感性可以在F1代表达,在F2代出现分离.

Effects of photoperiod heredity character on plant growth in ensilage corn

In this paper, the photopeirod sensitivity of 6 corn varieties was measured. Six corn varieties are male and female parents plants of Huanong No. 1, F1 generation hybrid, F2 generation hybrid and other two contrastive varieties. The effects of long-day photoperiod on plant growth were done in Inner Mongolia by pot culture. The results indicated that significant difference of photoperiod sensitivity was observed among 6 varieties. Based on the index of total leaf number (TLN), those varieties could be divided into four types: the extremely sensitive type, sensitive type, relatively sensitive type and relatively non-sensitive type. The results in pot culture experiment showed that the photoperiod significantly regulated shoot growth of the sensitive type, but had no significant effects on the relatively non-sensitive type. Under the conditions of long-day light in Inner Mongolia, the numbers of plant height, shoot dry mass, stem girth of sensitive ensilage corn were low in seedling stage (5-leaf period), but significantly increased in harvest stage. Being long-day light inhibition, the extremely sensitive type grew relatively slowly in all of its development stages. The results also indicated that photoperiod sensitivity appeared in F1 generation and separated in F2 generation.