【摘要】 本文从碳素同化、消耗与积累的角度分析了苏协一号和徐州424两个栽培大豆品种第二复叶一生中同化物潜在供应能力及¹⁴C同化物输出速率的变化。在同化物供应高值期,光合产物的潜在供应能力最大,比叶重和呼吸速率相当稳定,¹⁴C光合产物输出速率与潜在供应能力间呈极显著线性相关。测定结果还表明,磷酸蔗糖合成酶（SPS）对叶片中光合产物输出有重要调节作用。更多还原

【Abstract】 This paper deals with photosynthate supply and export from the second trifoliate of two soybean varieties（Glycine max （L.） Merr. Shuxie No.1 and Xuzhou 424）. There were four stages: （1） the importing stager;（2） the assimilate supply increasing stage; （3） the lasting stage with higher photosynthate supply;（4） the decreasing stage. The third stage was considered as the most important one for leaf function over its life, in which the specific leaf weight and respiration rate were stable. Export oF ¹⁴C-labelled assimilate evidently coincided with changes of SPS activity and assimilate supply. There was an extremely significant positive correlation between the assimilate supply and export rate. SPS played an important role in the control of photosynthate export.更多还原