【摘要】 以郑单958为对照,对3个高产玉米品种籽粒灌浆特性进行研究,并运用Logistic生长模型拟合籽粒灌浆过程(R2>0.99),结果表明:迪卡517、登海605和金海5号较郑单958(CK)达到灌浆峰值后的灌浆速率下降相对较慢;籽粒灌浆速率和干物质积累量在籽粒生长各阶段均存在品种间差异,3个高产品种的最大灌浆速率、灌浆速率最大时生长量和平均灌浆速率均明显高于郑单958,而灌浆活跃期各品种表现与之接近。籽粒灌浆速率的提高,尤其是快增期灌浆速率高,利于缩短后期库容建成时间,促进籽粒快速灌浆,从而能进一步发挥品种增产潜力。更多还原

【Abstract】 In this experiment,the grain filling characteristics of three high-yielding maize cultivars were studied with ZD958 as control. The Logistic growth equation was used for the fitting of grain filling process( R2> 0. 99). The results showed that the grain filling process of the four cultivars showed a single peak curve consistently. Compared to ZD958,the grain filling rate of DK517,DH605 and JH5 decreased more slowly after the peak. The grain filling rate and dry matter accumulation were different in different grain growth period between different cultivars. The maximum and average grain filling rate and the grain weight at the stage with the maximum grain filling rate were all higher than those of ZD958; but in the active grain filling period,the performance of the three cultivars were same with that of ZD958. Therefore,enhancing the grain filling rate,especially in the rapidly increasing phase of grain weight,could accelerate the whole grain filling progress to shorten the duration of late grain filling,and maybe contribute to reaching a higher yield potential of maize hybrids.更多还原