【摘要】 为分析远缘杂交后代材料的高光效生理基础 ,测定了从热带地区筛选出的杂交高光效后代材料 SHP1(F2 )、SHP1- 1- 6 (F3 )、SHP1- 2 - 8(F3 )及其亲本 Azucena(O.sativa)与普通野生稻 (O.rufipogon) ,以及 3个对照品种 (O.sativa)的光合速率和气孔特性 ,分析了光合速率与气孔导度和气孔结构的关系。结果表明 3个高光效后代材料的光合速率和气孔密度及气孔乳突数显著高于其亲本及 3个栽培稻。相关分析表明 ,光合速率与气孔导度和气孔密度分别呈极显著、显著正相关 (相关指数分别为 R2 =0 .90 44 * * ,R2 =0 .810 0 * ) ,气孔密度与气孔导度表现出显著正相关 (R2 =0 .86 98* )。因此认为气孔是决定水稻光合速率的重要因子之一 ,通过与野生稻远缘杂交增加气孔密度可提高气孔导度 ,从而可能改善光合效率。更多还原

【Abstract】 In order to identify the physiological characteristics of high-photosynthetic efficiency among progenies of the wide crossing O.sativa and O.rufipogon, the photosynthetic rate and stomata characteristic of the three kind of progenies -SHP1(F 2), SHP1-6(F 3), SHP1-8(F 3) with high-photosynthetic efficiency in tropic, two parents-(O.sativa and O.rufipogon), and other three cultivars were measured, and the relationships among photosynthetic rate, stomata conductance and stomata traits were also analyzed. The results showed that the net photosynthetic rate, stomata density and the number of stomata particles of progenies were all significantly higher than that of parents and the other three cultivars. There existed significantly positive correlation between net photosynthetic rate and stomata conductance, stomata frequency (R 2=0.9044 **, R 2=0.8100 * respectively), the relationship between stomata frequency and stomata conductance was positive too (R 2=0.8698 **). So it was concluded that stomata was one of the major decisive factor on rice′s photosynthetic rate. Increasing the stomata frequency through wild crossing O.sativa×O.rufipogon can improve stomata conductance, then promoting photosynthetic efficiency sequentially.更多还原