Physiological and Biochemical Studies on the ι-Carrageenan Producing Red Alga Eucheuma uncinatum Setchell and Gardner from the Gulf of California

Physiological and Biochemical Studies on the ι-Carrageenan Producing Red Alga Eucheuma uncinatum... Abstract Cystocarpic and tetrasporic plants were identified from three geographically separate populations of the endemic red alga, Eucheuma uncinatum Setchell and Gardner, at two sites on the east and one site on the west coasts of the Gulf of California, Mexico. Photosynthetic and respiratory rates of each population were determined under varying light, temperature and salinities. The physiological studies indicate that E. uncinatum is a stenohaline alga requiring high light tevels with peak rates of photosynthesis occurring under cooler temperatures (20-28 C)' Our findings suggest that cool temperatures, high salinities, and shallow tanks should be used in mariculture efforts. Also, higher temperatures may be a major cause of the annual life history reported for natural populations (Dawson 1971, Norris 1975). No distinctions could be found between sexual stages or populations in the levels of ash, protein carbohydrate for entire plants or for carrageenan yield, viscosity, gel strength, and chemistry including molar ratios of galactose/3, 6-anhydrogalactose/ester sulfate. Eucheuma uncinatum carrageenan has a high level of sulfation, approaching, after alkali modification, the theoretical molar ratio of 0.5/0.5/1 for galactose/3, 6-anhydrogalactose/ester sulfate. The "typical" carrageenan off. uncinatum is contrasted with the "deviant" t-carrageenan found in E. isiforme from Florida where a http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Botanica Marina de Gruyter

Physiological and Biochemical Studies on the ι-Carrageenan Producing Red Alga Eucheuma uncinatum Setchell and Gardner from the Gulf of California

Botanica Marina, Volume 20 (7) – Jan 1, 1977

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Publisher
de Gruyter
Copyright
Copyright © 2009 Walter de Gruyter
ISSN
0006-8055
eISSN
1437-4323
DOI
10.1515/botm.1977.20.7.437
Publisher site
See Article on Publisher Site

Abstract

Abstract Cystocarpic and tetrasporic plants were identified from three geographically separate populations of the endemic red alga, Eucheuma uncinatum Setchell and Gardner, at two sites on the east and one site on the west coasts of the Gulf of California, Mexico. Photosynthetic and respiratory rates of each population were determined under varying light, temperature and salinities. The physiological studies indicate that E. uncinatum is a stenohaline alga requiring high light tevels with peak rates of photosynthesis occurring under cooler temperatures (20-28 C)' Our findings suggest that cool temperatures, high salinities, and shallow tanks should be used in mariculture efforts. Also, higher temperatures may be a major cause of the annual life history reported for natural populations (Dawson 1971, Norris 1975). No distinctions could be found between sexual stages or populations in the levels of ash, protein carbohydrate for entire plants or for carrageenan yield, viscosity, gel strength, and chemistry including molar ratios of galactose/3, 6-anhydrogalactose/ester sulfate. Eucheuma uncinatum carrageenan has a high level of sulfation, approaching, after alkali modification, the theoretical molar ratio of 0.5/0.5/1 for galactose/3, 6-anhydrogalactose/ester sulfate. The "typical" carrageenan off. uncinatum is contrasted with the "deviant" t-carrageenan found in E. isiforme from Florida where a

Journal

Botanica Marinade Gruyter

Published: Jan 1, 1977

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