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Pathway of /sup 14/Co/sub 2/ fixation in marine algae

Journal Article:

Abstract

Marine plants have a different metabolic environment which is likely to affect pathways of CO/sub 2/ fixation. It has been observed that in marine alga, Ulva lactuca, during short term light fixation of /sup 14/CO/sub 2/, besides PGA, an appreciable amount of activity was located in aspartate. This curious observation can now be explained on the basis of Hatch, Slack and Kortschak pathway of CO/sub 2/ fixation. In order to trace pathways of /sup 14/CO/sub 2/ in marine algae, a wide variety of algal specimens were exposed to NaH/sup 14/CO/sub 3/ in light and the products were analyzed. The algae selected were Ulva lactuca, Sargassum ilicifolium, Sphacelaria sp., Padina tetrastromatica, Chaetomorpha media and Enteromorpha tubulosa. It has been found that the pathways of CO/sub 2/ in the above marine algae differ from the conventional pattern recorded in Chlorella. The early labelling of aspartate and its subsequent utilization indicates that HSK pathway is operative in the marine algae. Malate synthesis is inhibited due to the effect of saline environment on the activity of malic dehydrogenase. Appreciable label in PGA is suggestive of the fact that Calvin and Bassham pathway as well as the HSK route are simultaneously operating. (auth)
Authors:
Joshi, G V; Karekar, M D [1] 
  1. Shivaji Univ., Kolhapur (India). Dept. of Botany
Publication Date:
Aug 01, 1973
Product Type:
Journal Article
Reference Number:
EDB-76-050023
Resource Relation:
Journal Name: Proc. Indian Natl. Sci. Acad., Part B; (India); Journal Volume: 39:4; Other Information: 3 tables, 1 fig., 19 refs
Subject:
59 BASIC BIOLOGICAL SCIENCES; CARBON DIOXIDE; METABOLISM; CARBOXYLATION; TRACER TECHNIQUES; ALGAE; ASPARTIC ACID; CARBON 14 COMPOUNDS; PHOTOSYNTHESIS; AMINO ACIDS; BIOMASS; CARBON COMPOUNDS; CARBON OXIDES; CARBOXYLIC ACIDS; CHALCOGENIDES; CHEMICAL REACTIONS; ENERGY SOURCES; ISOTOPE APPLICATIONS; LABELLED COMPOUNDS; ORGANIC ACIDS; ORGANIC COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PHOTOCHEMICAL REACTIONS; PLANTS; RENEWABLE ENERGY SOURCES; SYNTHESIS; 551001* - Physiological Systems- Tracer Techniques
OSTI ID:
7193060
Country of Origin:
India
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: PIBSB
Submitting Site:
INIS
Size:
Pages: 489-493
Announcement Date:
Jul 01, 1976

Journal Article:

Citation Formats

Joshi, G V, and Karekar, M D. Pathway of /sup 14/Co/sub 2/ fixation in marine algae. India: N. p., 1973. Web.
Joshi, G V, & Karekar, M D. Pathway of /sup 14/Co/sub 2/ fixation in marine algae. India.
Joshi, G V, and Karekar, M D. 1973. "Pathway of /sup 14/Co/sub 2/ fixation in marine algae." India.
@misc{etde_7193060,
title = {Pathway of /sup 14/Co/sub 2/ fixation in marine algae}
author = {Joshi, G V, and Karekar, M D}
abstractNote = {Marine plants have a different metabolic environment which is likely to affect pathways of CO/sub 2/ fixation. It has been observed that in marine alga, Ulva lactuca, during short term light fixation of /sup 14/CO/sub 2/, besides PGA, an appreciable amount of activity was located in aspartate. This curious observation can now be explained on the basis of Hatch, Slack and Kortschak pathway of CO/sub 2/ fixation. In order to trace pathways of /sup 14/CO/sub 2/ in marine algae, a wide variety of algal specimens were exposed to NaH/sup 14/CO/sub 3/ in light and the products were analyzed. The algae selected were Ulva lactuca, Sargassum ilicifolium, Sphacelaria sp., Padina tetrastromatica, Chaetomorpha media and Enteromorpha tubulosa. It has been found that the pathways of CO/sub 2/ in the above marine algae differ from the conventional pattern recorded in Chlorella. The early labelling of aspartate and its subsequent utilization indicates that HSK pathway is operative in the marine algae. Malate synthesis is inhibited due to the effect of saline environment on the activity of malic dehydrogenase. Appreciable label in PGA is suggestive of the fact that Calvin and Bassham pathway as well as the HSK route are simultaneously operating. (auth)}
journal = {Proc. Indian Natl. Sci. Acad., Part B; (India)}
volume = {39:4}
journal type = {AC}
place = {India}
year = {1973}
month = {Aug}
}