Membrane phospholipids as a phosphate reserve: the dynamic nature of phospholipid-to-digalactosyl diacylglycerol exchange in higher plants.

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Tjellström, Henrik,1974Gothenburg University,Göteborgs universitet,Institutionen för växt- och miljövetenskaper,Department of Plant and Environmental Sciences (author)

Membrane phospholipids as a phosphate reserve: the dynamic nature of phospholipid-to-digalactosyl diacylglycerol exchange in higher plants.

Article/chapterEnglish2008

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2008

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LIBRIS-ID:oai:gup.ub.gu.se/78728
https://gup.ub.gu.se/publication/78728URI

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Language:English

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SwePubSwePub

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

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ABSTRACT It is well established that phosphate deficiency induces the replacement of membrane phospholipid with non-phosphorous lipids in extra-plastidial membranes (e.g. plasma membrane, tonoplast, mitochondria). The predominant replacement lipid is digalactosyl diacylglycerol (DGDG). This paper reports that the phospholipid-to-DGDG replacement is reversible, and that when oat seedlings are re-supplied with radio-labelled phosphate, it is initially recovered primarily in phosphatidylcholine (PC). Within 2 d, the shoot contains more than half of the lipid-associated radiolabel, reflecting phosphate translocation. Oat was also cultivated in different concentrations of phosphate and the DGDG/PC ratio in roots and phospholipase activities in isolated plasma membranes was assayed after different times of cultivation. The DGDG/PC ratio in root tissue correlated more closely with plasma membrane-localized phospholipase D, yielding phosphatidic acid (PA), than with plasma membrane-localized PA phosphatase, the activity that results in a decreased proportion of phospolipids. The lipid degradation data did not reflect a significant involvement of phospholipase C, although a putative phospholipase C analogue, non-specific phospholipase C4 (NPC4), was present in oat roots. The correlation between increased phospholipase D activity and DGDG/PC ratio is consistent with a model where phospholipid-to-DGDG replacement involves formation of PA that readily is removed from the plasma membrane for further degradation elsewhere.

Subject headings and genre

NATURVETENSKAP Biologi Botanik hsv//swe
NATURAL SCIENCES Biological Sciences Botany hsv//eng
NATURVETENSKAP Biologi Cellbiologi hsv//swe
NATURAL SCIENCES Biological Sciences Cell Biology hsv//eng
Avena sativa • DGDG • digalactosyl diacylglycerol • oat • PAP • phopholipase • phosphate • plasma membrane • PLD • stress

Added entries (persons, corporate bodies, meetings, titles ...)

Andersson, Mats X.,1977Gothenburg University,Göteborgs universitet,Institutionen för växt- och miljövetenskaper,Department of Plant and Environmental Sciences(Swepub:gu)xamatb (author)
Larsson, Karin E.,1958Gothenburg University,Göteborgs universitet,Institutionen för växt- och miljövetenskaper,Department of Plant and Environmental Sciences(Swepub:gu)xlkaru (author)
Sandelius, Anna Stina,1952Gothenburg University,Göteborgs universitet,Institutionen för växt- och miljövetenskaper,Department of Plant and Environmental Sciences(Swepub:gu)xsanas (author)
Göteborgs universitetInstitutionen för växt- och miljövetenskaper (creator_code:org_t)

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In:Plant Cell & Environment31:10, s. 1388-1398

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NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Botany

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By the university: University of Gothenburg

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