Effects of low-temperature stress on the metabolism of phosphatidylglycerol molecular species in Dunaliella salina |
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| Authors: | H A Norman G A Thompson |
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| Affiliation: | 1. Jiangsu Key Laboratory of Crop Genetics and Physiology & Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou, Jiangsu, China;2. Rice Research Institute of Guizhou Province, Guiyang, China;1. The Key Laboratory of Plant Resources Conservation and Germplasm Innovation in Mountainous Regions (Ministry of Education), Institute of Agro-Bioengineering, Guizhou University, Guiyang, 550025, China;2. State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing, 100193, China;1. Agriculture and Agri-Food Canada, Québec City, Canada;2. Centre de Recherche Sur Les Grains Inc. (CÉROM), Beloeil, Canada;3. Agriculture and Agri-Food Canada, Kentville, Canada;1. Hokkaido Agricultural Research Center, National Agriculture and Food Research Organization (NARO), Toyohira-ku, Sapporo 062-8555, Japan;2. Graduate School of Agriculture, Hokkaido University, Kita-ku, Sapporo 060-8589, Japan;3. Institute of Crop Science, National Agriculture and Food Research Organization (NARO), Kannondai, Tsukuba 305-8518, Japan |
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| Abstract: | A detailed analysis was made of individual phosphatidylglycerol (PG) molecular species isolated from microsomes and chloroplasts at various times after labeling Dunaliella salina cells with [14C]palmitic, [14C]oleic, or [14C]lauric acid. The patterns of [14C]fatty acid incorporation were in agreement with PG being formed by the "eucaryotic" type pathway in microsomes and the "procaryotic" type pathway in chloroplasts. In Dunaliella, which lacks a quantitatively significant flux of eucaryotic-type lipids from microsomes into chloroplast glycolipids, indications were found for a more subtle movement of microsomally synthesized PG into the chloroplasts. This transfer was more evident in cells stressed by exposure to 12 degrees C than it was at 30 degrees C, and may afford a mechanism for recruiting key microsomal PG molecular species toward low-temperature acclimation in chloroplasts. |
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