不同穗型的两个水稻品种株型的研究

The Study on Plant Shape of Different Panicle Rice Varieties

以不同穗型水稻品种为试材,研究不同穗型水稻的株型.结果表明:与弯曲穗型水稻相比,直立穗型水稻品种在灌浆过程中,穗子基本保持直立,叶片尤其是上三叶叶片夹角小,从而使得在水稻的生育后期冠层光分布合理,群体中下部受光条件好,有利于CO2的扩散,有利于籽粒灌浆;而弯曲穗型品种随着灌浆的进行,穗子逐渐弯曲,对茎秆的作用力增大,易倒伏.在水稻的开花期和乳熟期群体饲喂CO2,发现稻穗的光合量仅占单株总光合量的5.4%,即稻穗由弯曲变直立后,穗本身功能并未增强.

Selecting two typical different panicle rice varieties to study rice shape, the result shows： comparing with the curved panicle rice variety, in grain filling stage, the spike of erect panicle rice variety protect vertical condition, intersection angle of leaf especial the upper third leaves are very small, so the distribution of light in the crown of rice is very reasonable, the light reaching to the middle and lower part of the rice is very great, which contributes to the diffusion of CO2 and grain filling. The spike of the curved panicle rice is becoming crooked and crooked with the grain filling, and the force on stem is also turning greater and greater, all these easily lead rice to fall. In flowering and milky stage, rice population was labeled through CO2, the result showed that the photosynthesis of panicle was only 5.4 percent, and which was roughly the same between the erect panicle rice type and curved panicle rice type.