HETEROTROPHY AND PHOTOHETEROTROPHY BY ANTARCTIC MICROALGAE: LIGHT‐DEPENDENT INCORPORATION OF AMINO ACIDS AND GLUCOSE 1
HETEROTROPHY AND PHOTOHETEROTROPHY BY ANTARCTIC MICROALGAE: LIGHT‐DEPENDENT INCORPORATION OF AMINO ACIDS AND GLUCOSE 1
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南极微藻的异养性和光异养性：氨基酸和葡萄糖的光依赖性结合 1
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
M. Putt
中科院分区：
文献类型：
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作者：
R. Rivkin;M. Putt
从南极洲麦克默多湾的底栖生物、浮游生物和海冰微生物群落中分离出来的硅藻在光照和黑暗条件下都吸收了周围环境中溶解的氨基酸和葡萄糖的浓度。氨基酸的摄取受培养辐照度的影响，而葡萄糖的摄取不受影响，氨基酸的摄取率高达葡萄糖的250倍。氨基酸被结合到蛋白质和其他复杂聚合物中，聚合物合成的同化速率和模式与无机碳在光饱和光合作用下的结合相似。这表明这些硅藻可以利用外源氨基酸合成异养生长所必需的大分子。溶解有机基质的同化可以补充南方春季和夏季的光限制生长，并可能支持这些硅藻在整个无光的极地冬季的异养生长。
Diatoms isolated from the benthic, planktonic and sea ice microbial communities in McMurdo Sound, Antarctica assimilated ambient concentrations of dissolved amino acids and glucose in both the light and dark. Uptake of amino acids but not glucose was influenced by the iucubation irradiance and amino acid uptake rates were up to 250 times greater than those of glucose. Amino acids were incorporated into proteins and other complex polymers and the rates of assimilation and patterns of polymer synthesis were similar to those of the light‐saturated photosynthetic incorporation of inorganic carbon. This suggests that these diatoms can use exogenous amino acids to synthesize the essential macromolecules for heterotrophic growth. The assimilation of dissolved organic substrates could supplement light‐limited growth during the austral spring and summer as well as potentially support the heterotrophic growth of these diatoms throughout the aphotic polar winter.