Photosynthesis in marine macroalgae: evidence for carbon limitation
Photosynthesis in marine macroalgae: evidence for carbon limitation
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DOI：
10.1139/b88-083
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发表时间：
1988-03
期刊：
影响因子：
1.1
通讯作者：
G. P. Holbrook;S. Beer;W. Spencer;J. Reiskind;Joseph S. Davis;G. Bowes
中科院分区：
文献类型：
--
作者：
G. P. Holbrook;S. Beer;W. Spencer;J. Reiskind;Joseph S. Davis;G. Bowes
在船上远征安德罗斯岛（巴哈马），光合测量的大型藻类Cladophoropsis membranacea（绿藻门），Dilophus guineensis，Turbinaria turbinata，和Lobophora variegata（褐藻门），和Laurencia papillosa（红藻门），直接从他们的海洋栖息地，表明只有Cladophoropsis饱和海水无机碳水平（2.5毫米）。无机碳的光合k0.5值范围从1.1到3.2毫米。降低pH值在2.5毫米无机碳，从而提高CO2的30倍，只有轻微增加光合作用，这表明碳酸氢盐是主要的无机碳同化形式。在2.5 mM无机碳，只有Lobophora表现出瓦尔堡光合作用的影响（49%），但在0.5 mM，Turbinaria和凹顶藻也被O2抑制。核酮糖二磷酸羧化酶-加氧酶似乎是主要的羧化酶，但在双头藻和凹顶藻提取物中，它的活性与磷酸烯醇化酶相当。
During a shipboard expedition to Andros Island (Bahamas), photosynthetic measurements for the macroalgae Cladophoropsis membranacea (Chlorophyta), Dilophus guineensis, Turbinaria turbinata, and Lobophora variegata (Phaeophyta), and Laurencia papillosa (Rhodophyta), taken directly from their marine habitat, showed that only Cladophoropsis was saturated at seawater inorganic carbon levels (2.5 mM). The photosynthetic k0.5 values for inorganic carbon ranged from 1.1 to 3.2 mM. Decreasing the pH at 2.5 mM inorganic carbon, and thus enhancing the CO2 by 30-fold, only slightly increased photosynthesis, suggesting that bicarbonate was the major assimilated form of inorganic carbon. At 2.5 mM inorganic carbon, only Lobophora exhibited a Warburg effect on photosynthesis (49%), but at 0.5 mM, Turbinaria and Laurencia were also inhibited by O2. Ribulosebisphosphate carboxylase–oxygenase appeared to be the predominant carboxylation enzyme, but in Dilophus and Laurencia extracts, its activity was rivaled by phosphoeno...