玉米光合性能与产量关系的研究

为搞清玉米光合性能与产量的关系，大田条件下研究了叶面积、日照时数、叶片光合速率、光合量、呼吸量和收获指数与单株生物产量和籽粒产量的关系，结果表明：拔节期单株干重分别与当时的单株叶面积、累积日照时数、地上部呼吸量是显著或极显著的正相关，与叶片光合速率相关性最差；收获指数与单株籽粒产量相关性最好，吐丝期穗下叶光合量对单株籽粒产量的贡献最大。苗期的栽培措施应有利于扩大叶面积，育种实践中应注重收获指数的选择。

Relationship Between Photosynthetic Capacity and Yield of Maize Hybrids

Field experiments were conducted to evaluate the relationships between photosynthetic capacity(leaf area,sunlit hours,photosynthetic rate of leaf,photosynthate amount,respiration consumption and harvest index)and biomass per plant at elongating stage,barvested grain yield per plant in maize hybrids.The results showed that dty matter weight per plant was positively correlated with leaf area per plant,sunlit hours and respiration consumption of plant parts above ground at elongalting stage.Harvest index showed a positive correlation with grain yield per plant.Photosvflthate amount of leaf below ear was the largest in contributions to grain yield per plant at silking.It is suggested that leaf areaat seedling should be paid great attention.to and harvest Index should be suitable for selection crlterla for increased grain yielding in breeding of maize.