插秧密度对两种不同穗型水稻品种灌浆特性的影响  

Effect of transplanting density on grain-filling characters on two rice varieties with different types of panicles

作　　者：赵宏伟[1] 刘洋[1] 谷海东[1] 姚辰[1] 

机构地区：[1]东北农业大学农学院,哈尔滨150030

出　　处：《东北农业大学学报》2014年第9期18-24,共7页Journal of Northeast Agricultural University

基　　金："十二五"农村领域国家科技计划项目(2013BAD20B04);科技部科技攻关项目(2011BAD35B02-01);科技部科技支撑项目(2011BAD16B11)

摘　　要：以穗重型水稻品种东农425和穗数型水稻品种东农427为试验材料,运用Richards方程进行拟合,研究插秧密度对两种不同穗型水稻品种灌浆特性的影响。结果表明,在一定插秧密度范围内,两个水稻品种的强势粒灌浆速率(GRmax、GRmean)和籽粒充实度均随着密度的降低而升高,但当群体密度过低时下降;而弱势粒则表现为始终随着密度的降低而升高,插秧密度降低能显著提高弱势粒的灌浆速率(GRmax、GRmean),使两品种强弱势粒灌浆速率趋于同步。千粒重和结实率与水稻强、弱势粒灌浆速率呈显著或极显著正相关。插秧密度增大,使单位面积有效穗数增加,但高密度降低穗数型水稻品种东农427的灌浆速率、千粒重和结实率,抑制产量增加;低密度下东农425灌浆速率增加,千粒重、结实率均升高,有效穗数降低严重抑制穗重型水稻品种东农425产量增加。The paper study the effects of transplanting density on grain-fil ing characters on two rice varieties with different types of panicles, the grain-fil ing processes of Dongnong425 （rice panicle weight type） and Dongnong427 （rice panicle number type） were studied with Richards equation in this study. The results showed that in a certain range of transplanting density, the maximum grain-fil ing rate （GRmax）, mean grain-fil ing rate （GRmean） and grain ful ness of superior grains of the two rice varieties were increased with the density reduced;However, they were actual y decreased when the density was too low. While inferior grains were always increased with the density reduced, the reducing of density greatly increased the GRmax and GRmean of inferior grains, making the superior and inferior grains of two rice varieties tend to be synchronous grouting. 1000-grain weight and seed-setting rate was significantly or very significantly positively correlated with GRmax and GRmean of superior and inferior grains. With the increasing of transplanting density, effective panicles increased, but the yield of Dongnong427 was reduced with high transplanting density as the reduction of GRmax, GRmean, 1 000-grain weight and seed-setting rate; while the GRmax, GRmean, 1 000-grain weight and seed-setting rate of Dongnong425 were increased under low transplanting density, the yield of Dongnong425 was reduced as the reduction of effective panicles.

关 键 词：水稻 插秧密度 灌浆特性 

分 类 号：S511[农业科学—作物学]