辽宁省水稻光合特性及其与产量的关系

选用近来辽宁省主栽品种及在育种中有特殊作用的种质资源作为实验材料,对32份水稻材料的光合性状、叶面积指数及其与产量的关系进行研究.结果表明,抽穗期剑(旗)叶净光合速率与产量呈显著正相关;灌浆期倒二叶净光舍速率与产量呈极显著正相关.直立穗型、半直立穗型品种生育后期光合生产能力较强.抽穗期剑(旗)叶光合速率与产量呈抛物线关系,辽宁省大多数水稻品种抽穗期剑(旗)叶光合速率的最适范围是17～22μmol/(m2·s).分蘖期、拔节期、抽穗期、成熟期叶面积指数与产量呈极显著正相关.拔节期和抽穗期存在最适叶面积指数,其分别是2.8～4.O和5.5～6.3.分蘖期和成熟期叶面积指数几乎与产量呈线性关系.

Studies on Photosynthetic Characters and the Its Relationship with Yields in Japonica Rice

The relationship between photosynthetic characters and grain yield was studied with 32 main and special materials in Liaoning province.The results showed that there was significantly positive correlation between the Pn of flag leaf in the heading stage and grain yield,and the Pn of second leaf in the filling stage and grain yield.The photosynthesis ability of erect panicle and semi-erect panicle cultivars at late stage was stronger than that of curved panicle cultivars.There was parabola correlation between the Pn of flag leaf in the heading stage and grain yield,and the suitable range of Pn of flag leaf in most cultivars in the heading stage was 17～22 μmol/(m2·s).There were very significantly positive correlations between the LAI in the tillering,jointing, heading and ripening stages and grain yield.There was the most suitable LAI in the jointing and heading stages,being 2.8～4.0 and 5.5～6.3 resp.There was nearly line correlation between LAI in the tillering and ripening stage and grain yield.