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本研究以水稻品种蜀丰一号为材料,在抽穗期用红外线CO_2气体分析仪测定主茎各节位叶的净光合速率和用~(14)C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 CO_2·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~(14)C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~(14)C分配到分蘖穗、茎叶和根的比率比上位叶(剑叶、倒二叶)高。
In this study, the rice variety Shufeng I was used as material. The net photosynthetic rate of each leaf of main stem was measured by infrared CO 2 gas analyzer at heading stage and the photosynthate was analyzed by ~ (14) C. The results showed that the net photosynthetic rate of the leaves of main stem was 15.97, 12.85, 11.07 and 11.37 mg CO2 · h-1 · dm -2, respectively. The statistical test showed that the differences of flag leaf, inverted leaf, inverted leaf and inverted leaf were both significant and extremely significant. The differences between inverted leaf, inverted leaf and inverted leaf were insignificant. All of the organs assimilated by different node leaves of main stems could be distributed to different organs of rice plants. The rates of distribution were different, the ratio of main distribution to main spikes was higher, and the ratio of tillers to spikes was less. The assimilation of ~ (14) C in the lower lobe of the main stem (upturn, upturn) was higher than that of the upper lobe (flag leaf and upturn) in tillers, stems and leaves.