期刊
JOURNAL OF APPLIED PHYCOLOGY
卷 17, 期 3, 页码 255-259出版社
SPRINGER
DOI: 10.1007/s10811-005-5768-0
关键词
Hizikia fusiforme; leaf; photosynthesis; receptacle; temperature; Phaeophyta
Photosynthetic responses to irradiance and temperature of leaves and receptacles were compared in February ( vegetative stage) and May ( reproductive stage) in the seaweed, Hizikia fusiforme ( Harvey) Okamura (Sargassaceae, Phaeophyta) from Nanao Island, Shantou, China. Irradiance-saturated photosynthesis (P-max) was significantly higher in receptacles than in leaves on a fresh weight basis, and that of leaves was greater in May than in February at ambient seawater temperatures. The optimum temperature for P-max was 30 degrees C for both leaves and receptacles, being 5 - 10 degrees C higher than the ambient seawater temperature. The apparent photosynthetic efficiencies were greater in receptacles than in leaves within the tested temperature range of 10 - 40 degrees C. The irradiance for saturating photosynthesis for both leaves and receptacles was temperature-dependent, with the highest values ( about 200 mu mol photons m(-2) s(-1)) at 30 degrees C.
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