【摘要】 以徐薯18为材料,研究了四级程序生产甘薯种薯的主要生理指标。结果表明:育种家种薯、原原种薯、原种薯、良种薯的茎叶生长动态表现为前期生长快,中期加速,这有利于光合面积的形成;后期光合产物下移,有利于库的扩增。其叶面积系数前期增长快,能迅速形成较大的光合面积,光合效率高,结薯早,块根膨大快,鲜薯产量高,且在栽后90～110d块根膨大速度达到高峰。在整个生育期,四级种薯均表现出较强的光合势。更多还原

【Abstract】 This paper studies the main physiological indexes of seed stock of four-stage production courses of sweet potato.The results show that stems and leaves of breeder’s cuttings,original cuttings,stock cuttings and improved variety cuttings grow fast in early-stage and speed in mid-stage,which helps form the area of photosynthesis;the photosynthesis moves down the plant and helps enlarge the storage in later-stage.The LAI appears fast in early stage to form a larger area of photosynthesis with high efficiency.Its storage roots expand more speedily and the expanding speed reaches the peak during 90-110 d after planting.The trend of photosynthesis appears stronger during the whole growth.更多还原