两系法亚种间杂交稻两优培九结实率与源、库的关系

Relationship between Seed Setting Rate and Source sink of a Two line Intersubspecific Hybrid Liangyoupeijiu

研究了两系法亚种间杂交稻“两优培九”灌浆期上位 3叶及茎鞘内储存物对结实率及籽粒产量的作用 ,并通过调节源、库比例以探讨较高结实率所需的适宜叶粒比。结果表明 ,茎鞘内储存物和剑叶光合产物对结实率及籽粒产量的贡献率最大 ,提高出穗前的灌浆物质储备和维持灌浆期剑叶的功能对籽粒的形成最为重要。两优培九的群体叶粒比为 1.6～ 1.7厘米 2 /粒、每平方米群体总颖花量为 4.8× 10 4时较易获得 90 %的结实率和 11.0～11.6 t/hm2的产量水平。

The effects on seed setting rate and grain yield of upper three leaves and substances which stored in the sheath and stem were studied,and the appropriate ratio of leaf area (cm 2)/spikelet for a high seed setting rate in a two line intersubspecific hybrid “Liangyoupeijiu” was surveyed.The results showed that the contributions of the top leaf and the substances stored in the sheath and stem were the greatest to the seed setting rate and grain yield.To obtain a seed setting rate about 90% and a grain yield of 11 0～11 6 t/hm 2,1 6～1 7 cm 2 leaf areas for per spikelet and 4 8×10 4/m 2 spikelets were favorable.