High water-temperature tolerance in photosynthetic activity of Zostera marina seedlings from Ise Bay, Mie Prefecture, central Japan

Photosynthetic activities of seedlings of Zostera marina were successively measured using a gas volumeter for 6 days at seven light (0–400 μmol photons/m 2 per s) and 11 water temperature conditions (5–35°C). The seedlings were collected from mature plants (Ise Bay, central Japan), and stored and cu...

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Bibliographic Details
Published in:Fisheries science 2008-10, Vol.74 (5), p.1017-1023
Main Authors: Abe, M.(Mie Univ., Tsu (Japan). Faculty of Bioresources), Kurashima, A, Maegawa, M
Format: Article
Language:English
Subjects:
acclimation
Acclimatization
ADAPTACION
ADAPTATION
Biomedical and Life Sciences
Compensation
Fish & Wildlife Biology & Management
Food Science
FOTOSINTESIS
Freshwater & Marine Ecology
HEAT TOLERANCE
high water temperature
Incubators
Life Sciences
PHOTOSYNTHESE
PHOTOSYNTHESIS
PLANTULAS
PLANTULE
RESPIRACION
RESPIRATION
SEEDLINGS
tolerance
TOLERANCE A LA CHALEUR
TOLERANCIA AL CALOR
Water temperature
ZOSTERA MARINA
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Summary:Photosynthetic activities of seedlings of Zostera marina were successively measured using a gas volumeter for 6 days at seven light (0–400 μmol photons/m 2 per s) and 11 water temperature conditions (5–35°C). The seedlings were collected from mature plants (Ise Bay, central Japan), and stored and cultured in incubators accurately controlled at each test temperature. The maximum gross photosynthesis ( P maxg ) was recorded at an optimal water temperature of 29°C after 0 days. After 6 days, P maxg appeared at 25°C and most plants cultured at 29–30°C bleached and withered after the drastic increase of light compensation point ( I c ). On the contrary, at 5–28°C, the photosynthetic activities either changed little (5–25°C) or recovered after a temporal reduction (26–28°C); seedlings survived and looked healthy after being cultured for 6 days. The recovery was thought to be an acclimation to tolerate higher water temperature. As a result, the critical upper water temperature for Z. marina seedlings was proposed as 28°C. The temperature was consistent with the previously reported maximum water temperature in habitats around the southern boundary of Z. marina in the northern hemisphere.
ISSN:0919-9268
1444-2906
DOI:10.1111/j.1444-2906.2008.01619.x