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小麦各类茎顶端原基分化与播种后累积生长度日 ( GDD)之间均呈 S曲线关系 ,符合 L ogistic数学模型 ,表明小麦茎顶端各类原基的分化一旦启动 ,其分化速率均随着 GDD的增加呈现“慢 -快 -慢”的动态变化规律。虽然不同播期对苞叶原基和小穗原基的分化模式具有调节作用 ,但冬性与春性品种以及主茎与分蘖顶端原基分化的模式基本一致。原基分化热间距 ( GDD/原基 )按叶片—苞叶—小穗次序大幅度降低 ,显示小麦茎顶端原基分化强度具有随生育进程而递增的生物学规律。以 GDD计 ,不同播期之间苞叶原基分化终止期及小穗原基分化始期的差异远远大于苞叶原基分化始期的差异 ,说明小麦温光反应以对小穗原基分化期的调控作用为主。冬、春性品种主茎、分蘖的苞叶原基数 ( x)与小穗原基数 ( y)之间的相关均极显著 ,可统一用方程 y=1.812 +0 .897x描述
Stem-root primordial differentiation of all kinds of stems and cumulative growth-date (GDD) after sowing all showed a S-curve, which accorded with L ogistic mathematical model, indicating that once the differentiation of various stems of wheat stems started, the differentiation rate The increase of GDD presents the dynamic change rule of “slow-fast-slow”. Although the different sowing dates had a regulatory effect on the differentiation pattern of basal leaves and spikelet primordia, the patterns of differentiation between winter and spring varieties and primordia of main stem and tiller were basically the same. The differentiation distance (GDD / primordium) of the primordium was greatly reduced by the leaf-husk-spike order, indicating that the divergence intensity of the apical primordium of wheat stem had the biological rules that increased with the growth process. GDD, the difference between the early stage of differentiation and the initial stage of spikelet primordium differentiation was much greater than that of the early stage of basal leaves differentiation, indicating that the regulation of temperature and light on the regulation of spikelet primordium differentiation was the Lord. The correlation between tillering primordial number (x) and spikelet primordial number (y) in both winter and spring varieties was extremely significant and could be described by the equation y = 1.812 +0.897x