春小麦籽粒灌浆期沉淀值动态的定量研究

以3个不同品质类型春小麦品种为材料，在设定不 同肥力和气象条件等环境因子基础上，通过建立灌浆期籽粒沉淀值动态曲线拟合方程，定量揭示籽粒沉淀值的动态与规律。结果表明，灌浆期籽粒沉淀值随时间的变化符合一元三次多项式凸性曲线，即自开花始先增后降的单峰曲线。灌浆期籽粒沉淀值的动态，不同基因型具有不同特点。高蛋白强筋、高蛋白中筋和低蛋白弱筋品种曲线峰值分别出现在开花后28 d、23 d和30 d前后。各品种沉淀值积累速度的动态特点是成熟时沉淀值高蛋白强筋品种最高，高蛋白中筋品种次之，低蛋白弱筋品种最低的主要原因。

Dynamic Changes in Grain Sedimentation Test Value of Spring Wheat during Grain Filling

Field experiments with three spring wheats genotypes were carried out in Harbin in 2002 to study quautitatively the dynamic change of grain sedimentation test value affected by environmental factors including fertility and meterological condition. The results showed that the dynamic change of grain sedimentation test value with varied days after anthesis was well fitted with the third-order curve convex in shape. For different genotypes, the characteristics of their dynamic changes were different. Moreover,the differences of grain sedimentation test value between genotypes were varied during the period of grain filling. The dates corresponding to the curve peak values of the high protein-rich gluten genotype, the high proteinmedium gluten genotype and low protein-poor gluten genotype were the 28th, 23rd and 30th days after anthesis, respectively. The dynamic change shapes of the accumulation velocity curves for grain sedimentation test value in different genotypes were responsible for their sedimentation values at mature period, which were the highest in high protein-rich gluten genotype, the medium in high protein-medium gluten genotype, and the lowest in low protein-poor gluten genotype.