两系法亚种间杂交稻两优培九的高产生理基础初探

1998和 1 999年以两系法亚种间杂交稻两优培九为材料 ,以三系法品种间杂交籼稻汕优 63为对照 ,探讨了两优培九的高产生理基础。与汕优 63相比 ,两优培九生物学产量高 1 2 .1 % ,经济系数高 1 2 .5 %。生物学产量高是因为叶面积延续时间长 1 7.1 %和较高的光合速率 ;经济系数高是由于茎鞘叶物质转运系数高和齐穗期以前群体相对生长速率及净同化率较高。两优培九生育前期株型较松散 ,后期较紧凑 ,群体受光姿态良好。

Physiological Basis of High Yield of an Intersubspecific Hydrid Rice,Liangyoupeijiu

In 1998 and 1999, an intersubspecific hybrid, Liangyoupeijiu was tested to study its physiological basis of the high yield using an indica hybrid, Shanyou 63 as the control (ck). Liangyoupeijiu had a biomass yield of 20 2t/ha, 12 1% higher than the ck, and a harvest index of 0 56,12 5% higher than the ck. Its leaf area duration (LAD) was higher than the ck by 17 1%. The chlorophyll content and the maximum leaf photosynthetic rate were 8 4% and 6 9% higher than the ck respectively. Liangyoupeijiu had a higher transmission coefficient of substances which stored in the sheath, leaf and stem, a higher relative growth rate (RGR) and net assimilation rate (NAR) in the earlier growth stage. The plant type of Liangyoupeijiu was loose in its earlier growth stage and became compact in the later, resulting in a lower light extinction coefficient and a higher light transmission in the later stage.