کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8383749 | 1543303 | 2011 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Endogenous regulation of the growth-rate responses of a spring-dwelling strain of the freshwater alga, Chlorella minutissima, to light and temperature
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موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم کشاورزی و بیولوژیک (عمومی)
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چکیده انگلیسی
The paper presents a laboratory investigation of the temperature- and light- dependence of autotrophic growth of the alga Chlorella minutissima. It was isolated from the storage basin of a spring in the mountains of the Massif Central, France. The alga was grown at temperatures between (10 and 35 °C) and under irradiances from 30 to 550 μmol mâ2 sâ1, under a light/dark cycle. The results were fitted to selected descriptive models, seeking to express, as far as possible, the observed physiological behaviour of the strain and the minimum irradiance required to sustain net growth. At all temperatures, the maximum rates of growth observed are strikingly slower than those of other Chlorella strains and of other small algae, reported in the literature, even when correction is made for continuous light. The Q10 statistic for growth at temperatures >20 °C rates is also noticeably lower than in other species, while the apparent threshold of any growth is about 8 °C. Growth rates are readily light-saturated at all temperatures but with little evidence of adaptation of photosynthesis to low photon-flux rates. No short-term flexibility in these properties (over a time-scale of days) was demonstrated during the course of our experiments. We deduce that the algal strain had become genetically adapted to the relatively constant, even-temperature and low-light conditions of the spring-water habitat whence it was originally isolated.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Journal of Protistology - Volume 47, Issue 4, November 2011, Pages 239-244
Journal: European Journal of Protistology - Volume 47, Issue 4, November 2011, Pages 239-244
نویسندگان
Lotfi Aleya, Alain Dauta, Colin S. Reynolds,