寒地水稻品种子粒灌浆特性差异及其对结实率的影响

Varietal differences properties of grain filling and their effects to the percentage of ripened

用 L ogistic生长方程 W =K/ (1+ ae-bt)对寒地水稻品种 (系 )强、弱势子粒灌浆过程进行了分析 ,并依配得的 L ogistic方程导出了若干个子粒灌浆特性参数。结果表明 ,强势粒的起始灌浆量、最大灌浆强度高于弱势粒 ,有效灌浆期比弱势粒短 ,最大灌浆速率出现时间和最大灌浆速率期早于弱势粒。强、弱势粒各项灌浆参数均存在品种间差异。相关分析表明 ,强势粒和弱势粒的最大灌浆速率出现时间早、最大灌浆速率期早、平均灌浆强度高 ,弱势粒起始灌浆量大、最大灌浆速率高 ,强弱势粒同步灌浆性强 ;结实率高 ,寒地超高产水稻品种应适当提早抽穗期 ,从而提早弱势粒最大灌浆速率期 。

Logistic growing equation W=K1+ae -bt ) was used to describe properties of grain filling of superior and inferior grains of some Japonica rice varieties in cold area.Several parameters of grain filling were derived from the equation.The results were that superior grains were higher than inferier ones in the initial filling amount,the maximum and mean rate of grain filling,shorter in the effective period of grain filling,earlier in the time and date of the maximum rate of grain filling.There were varietal differences in all of grain filling properties of superior and inferior grains.The correlation analysis results showed that earlier the time of maximum rate and higher the mean rate of grain filling in superior and inferior grains,and higher initial filling amount and the maximum rate of grain filling were,the higher the percentage of ripened grains was.The synchronous grain filling variety was helpful to the percentage of ripened grains.The earlier date of the maximum date of grain filling was closed to the higher percentage of ripened grains,so the super-high yield variety in cold area should have earlier heading date to reach earlier date of the maximum rate of inferior grain filling and higher percentage of ripened grains.$$$$