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- Title
Temperature responses of growth, photosynthesis, respiration and NADH: nitrate reductase in cryophilic and mesophilic algae.
- Authors
Vona, Vincenza; Di Martino Rigano, Vittoria; Lobosco, Ornella; Carfagna, Simona; Esposito, Sergio; Rigano, Carmelo
- Abstract
• 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 O2 exchange. NADH : NR was assayed in crude extracts. • The two cryophilic algae grew below 15°C, and C. sorokiniana above 20°C. Photosynthetic and respiration rates of K. antarctica and ‘ C.’ saccharophila were elevated at 5°C, and peaked at 30°C. Arrhenius plots from 5 to 25°C were linear in K. antarctica, whereas in ‘ C.’ saccharophila and C. sorokiniana they exhibited breaks at 15 and 20°C, respectively. Values for activation energy ( Ea) and the factor by which the rate increases with raising the temperature 10°C ( Q10) differed. Nitrate reductase had its optimum at 25°C in cryophilic algae and at 35°C 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. © New Phytologist (2004) doi: 10.1111/j.1469-8137.2004.01098.x
- Subjects
ALGAL growth; PLANT growth; EFFECT of temperature on plants; PHOTOSYNTHESIS; BOTANY
- Publication
New Phytologist, 2004, Vol 163, Issue 2, p325
- ISSN
0028-646X
- Publication type
Article
- DOI
10.1111/j.1469-8137.2004.01098.x