Journal
PHYCOLOGICAL RESEARCH
Volume 62, Issue 3, Pages 187-196Publisher
WILEY
DOI: 10.1111/pre.12053
Keywords
algae; nori; photosynthesis; pulse amplitude modulation-chlorophyll fluorometry; temperature tolerance
Categories
Funding
- Japanese Ministry of Education, Culture, Sport and Technology [22510033, 25340012]
- Nagasaki University Strategy for Fostering Young Scientist by the Special Coordination Funds for Promoting Science and Technology of Ministry of Education, Culture, Sport, Science and Technology
- Grants-in-Aid for Scientific Research [22510033] Funding Source: KAKEN
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The effect of irradiance and temperature on the photosynthesis of the red alga, Pyropia tenera, was determined for maricultured gametophytes and sporophytes collected from a region that is known as one of the southern limits of its distribution in Japan. Macroscopic gametophytes were examined using both pulse-amplitude modulated fluorometry and/or dissolved oxygen sensors. A model of the net photosynthesis-irradiance (P-E) relationship of the gametophytes at 12 degrees C revealed that the net photosynthetic rate quickly increased at irradiances below the estimated saturation irradiance of 46 mu mol photons m(-2) s(-1), and the compensation irradiance was 9 mol photons m(-2) s(-1). Gross photosynthesis and dark respiration for the gametophytes were also determined over a range of temperatures (8-34 degrees C), revealing that the gross photosynthetic rates of 46.3 mu mol O-2 mg(chl-a)(-1) min(-1) was highest at 9.3 (95% Bayesian credible interval (BCI): 2.3-14.5)degrees C, and the dark respiration rate increased at a rate of 0.93 mu mol O-2 mg(chl-a)(-1) min(-1)degrees C-1. The measured dark respiration rates ranged from -0.06 mu mol O-2 mg(chl-a)(-1) min(-1) at 6 degrees C to -25.2 mu mol O-2 mg(chl-a)(-1) min(-1) at 34 degrees C. The highest value of the maximum quantum yield (Fv/Fm) for the gametophytes occurred at 22.4 (BCI: 21.5-23.3) degrees C and was 0.48 (BCI: 0.475-0.486), although those of the sporophyte occurred at 12.9 (BCI: 7.4-15.1) degrees C and was 0.52 (BCI: 0.506-0.544). This species may be considered well-adapted to the current range of seawater temperatures in this region. However, since the gametophytes have such a low temperature requirement, they are most likely close to their tolerable temperatures in the natural environment.
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