再生稻与同期抽穗主季稻源库特性比较

Source-sink Characteristics of Ratooning Rice and Its Same-term Earring Main Crop

比较研究了再生稻与同期抽穗主季稻的源库特性。结果表明,再生稻叶面积指数(LAI)与单茎叶面积为同期抽穗主季稻的1/8～1/5;产量约相当于主季的1/3～2/3,穗粒数约为主季稻的1/3～1/2,千粒重均较主季下降,但结实率略高于主季;再生稻粒叶比为主季的1.8～2.6倍,各时期比叶重一般均高于主季0.1～0.7 mg.cm-2;主季与再生季比叶重在乳熟至成熟阶段的变化趋势不同,主季下降而再生季上升;主季品种粒叶比与产量呈较明显的正相关;再生季品种间孕穗期、齐穗期LAI与产量呈明显正相关,粒叶比与产量也呈正相关;在源库关系上,主季稻属增库增产型,而再生季属增源增产型。

Six rice combinations were used to study the source-sink characteristics of ratooning rice and its same-term tasselling main crop. The results indicated that： Leaf area index （LAI） and Leaf area per culm of the former were about from one eighth to one fifth of those of the latter. The yield and the grain number per panicle of the former were about from one third to two third and from one third to one second of latter, respectively. Comparing to main crop, 1 000-grain weight of ratooning rice was lower slightly and seed setting percent was higher slightly. The ratio of grain number to leaf area in the former was 1.8 to 2.6 times of that in the latter. Specific leaf weight of the former was 0.1-0.Tmg·cm^-2 heavier than that of the latter. In addition, its changing trend was different from each other between milky ripe stage and ripe stage, with that of the former rising and that of the former falling. There were positive correlations at the 0.05 level between the ratio of grain number to leaf area and yield of the former and the latter, between LAI from booting stage to full heading stage and yield of ratooning rice. The type of source-sink relationship of the former was the source limited. And that of the latter belonged to the sink limited.