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为了弄清水稻根系吸收的CO_2在体内的运输机制,进行了一系列的研究。结果表明,水稻幼苗中根系吸收的CO_2数量显著地大于大麦幼苗中根系吸收的CO_2数量。随着培养液中CO_2浓度的增加,水稻根系的吸收作用越来越明显。2,4D和叠氮钠抑制水稻和小麦根系内的暗固定作用,而对CO_2向上运输的效应不显著。用甘露醇处理,小麦根内CO_2向上运输减少了50%,而对水稻却没有明显的抑制作用。根内CO_2气体分析表明,培养液中CO_2的富集导致
In order to understand the transport mechanism of CO 2 absorbed by rice roots in vivo, a series of studies were carried out. The results showed that the amount of CO 2 absorbed by the roots of rice seedlings was significantly greater than that of the CO 2 absorbed by roots of barley seedlings. With the increase of CO 2 concentration in culture medium, the absorption effect of rice roots became more and more obvious. 2,4D and sodium azide inhibited the dark fixation in rice and wheat roots, but had no significant effect on CO 2 uptake. With mannitol, up-transport of CO 2 in wheat roots decreased by 50%, but had no obvious inhibitory effect on rice. Analysis of root CO 2 gas showed that CO 2 enrichment in the culture medium was caused