Comparison of the Lipid Composition of Oat Root and Coleoptile Plasma Membranes: Lack of Short-term Change in Response to Auxin

Overview

Journal Plant Physiol

Specialty Physiology

Date 1989 Jan 1

PMID 11537452

Citations 6

Authors

R P Sandstrom

R E Cleland

Affiliations

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Abstract

The total lipid composition of plasma membranes (PM), isolated by the phase partitioning method from two different oat (Avena sativa L.) tissues, the root and coleoptile, was compared. In general, the PM lipid composition was not conserved between these two organs of the oat seedling. Oat roots contained 50 mole percent phospholipid, 25 mole percent glycolipid, and 25 mole percent free sterol, whereas comparable amounts in the coleoptile were 42, 39, and 19 mole percent, respectively. Individual lipid components within each lipid class also showed large variations between the two tissues. Maximum specific ATPase activity in the root PM was more than double the activity in the coleoptile. Treatment of coleoptile with auxin for 1 hour resulted in no detectable changes in PM lipids or extractable ATPase activity. Differences in the PM lipid composition between the two tissues that may define the limits of ATPase activity are discussed.

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