光合作用与光呼吸及乙醛酸代谢：重新审视和关联若干先前的研究。
Photorespiration and Glycolate Metabolism: A Re-examination and Correlation of Some Previous Studies.
机构信息
Department of Botany, The University of British Columbia, Vancouver 8, British Columbia.
出版信息
Plant Physiol. 1968 Jun;43(6):923-9. doi: 10.1104/pp.43.6.923.
Some previous studies of photorespiration and glycolate oxidation were re-examined and correlated by infra-red CO(2) analysis. Data about rate of photosynthesis and oxygen sensitivity indicated that complete inhibition of photosynthesis with 3-(3,4-dichlorophenyl)-1,1 dimethyl urea (DCMU) allowed dark respiration to continue in the light. Photorespiration was also inhibited. The oxygen sensitivity of glycolate-stimulated CO(2) production was found to be compatible with the proposal that glycolate is a substrate of photorespiration. Both ;in vivo' and ;in vitro' studies of the alga Nitella flexilis have revealed a pathway of glycolate oxidation similar to that of higher plants. DCMU inhibition of photosynthesis by Nitella gave results similar to those for the monocotyledons tested. Under very low light intensity, carbon dioxide compensation in corn was measurable but was not sensitive to high oxygen concentration. It appears that the lack of photorespiration in this plant is not the end result of efficient internal recycling of CO(2) to photosynthesis.
一些先前关于光呼吸和乙醛酸氧化作用的研究，经红外线 CO2 分析重新进行了检查和相互关联。光合作用速率和氧气敏感性的数据表明，用 3-(3,4-二氯苯基)-1,1-二甲基脲（DCMU）完全抑制光合作用，可以在光照下继续进行暗呼吸。光呼吸也被抑制。发现乙醛酸刺激 CO2 产生的氧气敏感性与乙醛酸是光呼吸底物的提议是一致的。对藻类尼氏水韭的 ;体内'和 ;体外'研究揭示了一种类似于高等植物的乙醛酸氧化途径。DCMU 对尼氏水韭光合作用的抑制作用与测试的单子叶植物的结果相似。在非常低的光强度下，玉米的二氧化碳补偿是可以测量的，但对高氧浓度不敏感。看来，这种植物缺乏光呼吸并不是内部 CO2 高效回收至光合作用的最终结果。
Zotero 插件