【摘要】 本研究以水稻品种蜀丰一号为材料,在抽穗期用红外线CO₂气体分析仪测定主茎各节位叶的净光合速率和用¹⁴C研究光合产物的运转与分配。研究表明:主茎各节位叶的净光合速率分别为15.97,12.85,11.07,11.37mg CO₂·小时^-1·分米^-2。经统计检验,剑叶与倒二叶、倒三叶,倒四叶差异均达显著和极显著水准,倒二叶,倒三叶,倒四叶之间差异不显著。主茎不同节位叶同化的¹⁴C都能运转分配至稻株的各器官,其分配的比率不相同,分配到主穗的比率较高,分蘖穗的比率较少。主茎下位叶（倒三、倒四叶）同化的¹⁴C分配到分蘖穗、茎叶和根的比率比上位叶（剑叶、倒二叶）高。更多还原

【Abstract】 The intensity of photosynthesis and the assimilative distribution of ¹⁴C in the different node leaves（the flag, 2nd, ard and 4th leaves）of the rice heading stage were studied witha type variety-Shufong NO. 1. The results indicated that the speeds of photosynthesis in the node leaves of main stem were 15.97, 12.85, 12.07, 11.37 mgCO₂. h^-1. dm² respectively, ¹⁴C was assimilated in the different, node leaves and distributed to all organum of rice. The distribution ratio of ¹⁴C from different node leaves wes higher in the main stem than that in tellers. The ¹⁴C from the 3rd and 4th leaves was distributed to the tellers, stems, leaves and roots more than that from the flag and 2nd leaves.更多还原