Temperature responses of growth, photosynthesis, respiration and NADH: nitrate reductase in cryophilic and mesophilic algae
Temperature responses of growth, photosynthesis, respiration and NADH: nitrate reductase in cryophilic and mesophilic algae
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DOI：
10.1111/j.1469-8137.2004.01098.x
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发表时间：
2004-08-01
期刊：
影响因子：
9.4
通讯作者：
Rigano, C
中科院分区：
文献类型：
--
作者：
Vona, V;Rigano, VD;Rigano, C
研究了温度对嗜冷藻类Koliella anastritica、“Chlorella”saccharophila和中温小球藻（Chlorella sorokiniana）生长、光合作用、呼吸作用和硝酸还原酶（NR）的影响。饱和光下的光合作用和黑暗下的呼吸作用以O-2交换计。两种嗜冷藻在15 ℃以下生长，C. sorokiniana高于20 ℃。光合速率和呼吸速率。anacutica和C.嗜糖菌在5 ℃时生长迅速，在30 ℃时达到高峰。在5 ~ 25 ℃范围内，K. anaitica，而在C. saccharophila和C. sorokiniana，它们分别在15和20 ℃下表现出断裂。活化能（E-a）和速率随温度升高10 ℃而增加的因子（Q（10））的值不同。硝酸还原酶在嗜冷藻类中的最佳温度为25 ℃，在C中的最佳温度为35 ℃。sorokiniana.我们的结论是，在低温下，嗜冷藻类的生长有利于提高光合作用和呼吸速率，但它可能受到限制的高呼吸：光合作用比。(C)新植物学家（2004）。
Temperature effects on growth, photosynthesis, respiration and nitrate reductase (NR) were studied in the cryophilic algae Koliella antarctica and 'Chlorella'saccharophila, and in the mesophilic Chlorella sorokiniana.Growth rate was measured as increase in optical density. Photosynthesis at saturating light and respiration in darkness were measured as O-2 exchange. NADH : NR was assayed in crude extracts.The two cryophilic algae grew below 15degreesC, and C. sorokiniana above 20degreesC. Photosynthetic and respiration rates of K. antarctica and 'C.' saccharophila were elevated at 5degreesC, and peaked at 30degreesC. Arrhenius plots from 5 to 25degreesC were linear in K. antarctica, whereas in 'C.' saccharophila and C. sorokiniana they exhibited breaks at 15 and 20degreesC, respectively. Values for activation energy (E-a) and the factor by which the rate increases with raising the temperature 10degreesC (Q(10)) differed. Nitrate reductase had its optimum at 25degreesC in cryophilic algae and at 35degreesC in C. sorokiniana.We conclude that growth of cryophilic algae at low temperature is favoured by elevated photosynthesis and respiration rates, but that it could be limited by a high respiration : photosynthesis ratio. (C) New Phytologist (2004).