Physiological Ecology of the Brown Alga Phaeostrophion irregulare Setchell et Gardner: II Macroscopic Plants

Physiological Ecology of the Brown Alga Phaeostrophion irregulare Setchell et Gardner: II... Abstract The apparent photosynthesis of the macroscopic piants of Phaeostrophion irreguläre is light saturated at about 700 foot-candles. The blades are the main photosynthetic Organs of the plant äs their rate of photosynthesis is much greater than that of the holdfast. The Optimum temperature for photosynthesis for the blades and holdfasts is approximately 13.5°Ct but a high rate of photosynthesis occurs over a wide ränge of temperatures. The respiration of the blades and holdfast is very low and it may be of some adaptive advantage to the plant in sandy habitat where it grows abundantly. Neither respiration nor apparent photosynthesis of the blades is conspicuously different between 20-^40°/oo. The macroscopic plants are more tolerant than the juvenile stages to a wide ränge of temperature, salinity and desiccation conditions. Overall, the temperature and salinity tolerances of the macroscopic plants appear to be much greater than that required in nature, but this does not appear to be the case for resistance to desiccation. Thus, the blades often die after a dehydration of 40-60%. The holdfasts of P. irreguläre seem to be more resistant than the blades to extreme conditions. a Standard size (diameter 11 mm) disc was cut from both http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Botanica Marina de Gruyter

Physiological Ecology of the Brown Alga Phaeostrophion irregulare Setchell et Gardner: II Macroscopic Plants

Botanica Marina, Volume 25 (2) – Jan 1, 1982

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Publisher
de Gruyter
Copyright
Copyright © 2009 Walter de Gruyter
ISSN
0006-8055
eISSN
1437-4323
DOI
10.1515/botm.1982.25.2.93
Publisher site
See Article on Publisher Site

Abstract

Abstract The apparent photosynthesis of the macroscopic piants of Phaeostrophion irreguläre is light saturated at about 700 foot-candles. The blades are the main photosynthetic Organs of the plant äs their rate of photosynthesis is much greater than that of the holdfast. The Optimum temperature for photosynthesis for the blades and holdfasts is approximately 13.5°Ct but a high rate of photosynthesis occurs over a wide ränge of temperatures. The respiration of the blades and holdfast is very low and it may be of some adaptive advantage to the plant in sandy habitat where it grows abundantly. Neither respiration nor apparent photosynthesis of the blades is conspicuously different between 20-^40°/oo. The macroscopic plants are more tolerant than the juvenile stages to a wide ränge of temperature, salinity and desiccation conditions. Overall, the temperature and salinity tolerances of the macroscopic plants appear to be much greater than that required in nature, but this does not appear to be the case for resistance to desiccation. Thus, the blades often die after a dehydration of 40-60%. The holdfasts of P. irreguläre seem to be more resistant than the blades to extreme conditions. a Standard size (diameter 11 mm) disc was cut from both

Journal

Botanica Marinade Gruyter

Published: Jan 1, 1982

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