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Title: Stress tolerance of photosynthesis in sporelings of the red alga Grateloupia doryphora compared to that of stage III thalli
Authors: Rodrigo, M.
Robaina, R. R. 
UNESCO Clasification: 241719 Fisiología vegetal
251004 Botánica marina
Keywords: Chlorophyll
Stress Tolerance
Issue Date: 1997
Publisher: 0025-3162
Journal: Marine Biology 
Abstract: More experimental evidence is needed to understand the role of propagules in macroalgal biology. There are no reports in the literature on the comparative physiology (e.g. photosynthesis) of sporelings and adults. In this paper we report on the␣variation␣in␣photosynthetic parameters (maximum photosynthesis, P max , and efficiency, alpha, and dark respiration (R d ) of cultivated young sporelings of the red alga␣Grateloupia␣doryphora (Montagne) Howe under normal conditions and after a short-term incubation at different salinities and temperatures. The results are compared to those␣for␣adult Stage III thalli obtained in laboratory culture from the same population of sporelings. The pigment composition of sporelings (more chlorophyll a and less phycoerthryn and phycocyanin than adults) promotes a better photosynthetic performance (higher P max and alpha and lower R d ) under chlorophyll a excitation. The younger sporelings were also more tolerant to variations in salinity and temperature than Stage III, in which the highest variation in maximum photosynthesis and dark respiration was observed.
ISSN: 0025-3162
DOI: 10.1007/s002270050136
Source: Marine Biology [ISSN 0025-3162], v. 128, p. 689-694
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