Department of Botany, Iowa State University, Ames, Iowa 50011.
Plant Physiol. 1989 Jan;89(1):133-7. doi: 10.1104/pp.89.1.133.
Chlamydomonas reinhardtii and other unicellular green algae have a high apparent affinity for CO(2), little O(2) inhibition of photosynthesis, and reduced photorespiration. These characteristics result from operation of a CO(2)-concentrating system. The CO(2)-concentrating system involves active inorganic carbon transport and is under environmental control. Cells grown at limiting CO(2) concentrations have inorganic carbon transport activity, but cells grown at 5% CO(2) do not. Four membrane-associated polypeptides (M(r) 19, 21, 35, and 36 kilodaltons) have been identified which either appear or increase in abundance during adaptation to limiting CO(2) concentrations. The appearance of two of the polypeptides occurs over roughly the same time course as the appearance of the CO(2)-concentrating system activity in response to CO(2) limitation.
莱茵衣藻和其他单细胞绿藻对 CO(2)具有很高的表观亲和力，光合作用对 O(2)的抑制作用很小，并且光呼吸作用降低。这些特性源于 CO(2)浓缩系统的运作。CO(2)浓缩系统涉及到活跃的无机碳运输，并受环境控制。在限制 CO(2)浓度下生长的细胞具有无机碳运输活性，但在 5%CO(2)下生长的细胞则没有。已经鉴定出四种与膜相关的多肽（Mr19、21、35 和 36 千道尔顿），它们在适应限制 CO(2)浓度时出现或丰度增加。其中两种多肽的出现与 CO(2)限制下 CO(2)浓缩系统活性的出现大致同时发生。
