不同自然脱水类型玉米品种籽粒含水率变化与灌浆动态的关系
为明确玉米籽粒含水量变化与灌浆动态的关系,以不同自然脱水速率玉米品种为材料,分析其花后籽粒含水量、粒重、体积和籽粒灌浆的动态变化以及灌浆参数。结果表明,不同自然脱水类型玉米品种籽粒含水量变化,以花后29d和46d为时间点,可划分为3个阶段。两种类型玉米品种46d后自然脱水速率与蜡熟期(29d-46d)籽粒含水量的变化趋势均正好相反。籽粒体积和粒重变化趋势基本一致,花后46d品种间差异逐渐加大。不同类型玉米品种灌浆动态变化差异较大,自然脱水快的品种(先玉335和桥玉8号)和自然脱水慢的品种(蠡玉16和中科4号)最大灌浆速率分别出现在花后29d和36d,二者最大灌浆速率差异达到显著水平,自然脱水快品种平均灌浆速率低于脱水慢的品种,且活跃灌浆期较于脱水慢品种。两种类型品种籽粒含水量变化和灌浆速率呈正相关关系,其中脱水快类型品种达到显著水平,相关系数为0.805(R0.05=0.755)。因此,灌浆速率峰值出现时间较晚,最大灌浆速率较低以及活跃灌浆时间较长可能是后期籽粒含水率下降较慢的原因。
英文摘要:
To clear the relationship of grain water content and seed filling dynamic, we use different types of natural dehydration maize as materials, and which of the grain water content, grain weight, volume and grouting parameter were analyzed. The results showed that the changing of grain water content can be divided into three points basis for the change trend of grain water content at 29d and 46d, the rate of natural dehydration (46 day after anthesis) and water content of dough stage is a reverse trend. The changing of grain volume and grain weight showed the same trend, and the differences between species increases gradually at 46 day after anthesis. There were greater differences in the seed filling dynamic of different cultivars, the maximum filling rate of the natural dehydration fast varieties (Xianyu 335 and Qiaoyu8) and natural dehydration slow varieties (Liyu16 and Zhongke4) appeared at the time point of 26d and 36d, which difference was significant. The average filling rate of natural dehydration fast varieties were lower than the dehydration fast varieties, and active grain filling period was shorter. There was a positive correlation between grain water content and filling rate, and natural dehydration fast varieties reached a significant level, then the coefficient of correlation r=0.805 (R0.05=0.755). Therefore, late peak filling rate, the maximum filling rate low, and filling longer active are the reason of grain water content decreased slowly at natural dehydration stages.
;
