杂交中稻高产品种灌浆期的库源特征
SINK- SOURCE CHARACTERISTICS OF HIGH- YIELDING COMBINATIONS OF HYBRID MID- SEASON RICE
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摘要: 以15个杂交中稻品种为材料，在高产栽培条件下，研究了灌浆期的库源特征与产量的关系。结果表明：齐穗期和成熟期的LAI、地上部干物重均分别与产量呈极显著正相关，齐穗期消光系数、LAI衰减率分别与产量呈极显著负相关，库大源足是高产品种的重要特征。高产品种每hm2产量9000kg以上的库源特征为：齐稳期的LAI6.5～7.0，成熟期的LAI3.5～4.0，成熟期的生物产量每hM218750k左右，每hm2颖花数37500万朵以上，齐稳期叶粒比1.7cm2/粒左右。
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关键词:
- 杂交中稻,高产品种,库源特征
Abstract: Fifteen hybrid md- season rice combinations were used to study the relationship between sink-source characteristics and grain yield at the seed- filling stage of the plants under high- yielding cultivation conditions. Highly significant positive correlation was shown to be present between LAI and shoot dry weight at the full heading and ripening stages, on the one hand, and grain yield, on the other. Extinction coefficient and attenuation rate of LAI at the full heading stage were in highly significant negative correlation with grain yield. High - yielding genotypes were generally characterized by large source and large sink. High- yielding combinations,with a yield of 9000kg/hm2 or more, shared the following sinksource characteristics:LAI 6.5～7.0 at the full-heading and 3.5～4.0 at maturation; biomass yield 18750 kg/hm2 at maturation; spikelet number over 37500 per hectare,and the ratio of leaf area to grain about 1.7 cm2/grain. -
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