Phosphatidylglycerol Molecular Species in Chilling-Sensitive and Chilling-Resistant Populations of Avicennia germinans (L.) L

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Phosphatidylglycerols (PG) from leaves and from roots of a chilling-sensitive (from Belize) and a chilling-tolerant (from Texas) population of the black mangrove Avicennia germinans (L.) L were compared with respect to both their fatty acid and molecular species compositions. There were distinct differences between the two populations, and also between root and leaf PG of the same population. In leafextracts thc combined totals of palmitic acid and trans-3-hexadecenoic acid-two components thought to be correlated with chilling sensitivity-were not significantly different between the two populations. However, the PG in which only those fatty acids were present, (i.e., dipalmitoyl and 1-palmitoyl-2-(trans-3-hexadecenoyl)PG, accounted for a significantly greater proportion of the total PG in leaves of the chilling-sensitive plants than in the more resistant population. This trend in molecular species composition was not maintained in roots,where PGS Were minor components. The findings are in only partial agreement with current ideas concerning the possible role of specific lipid molecules of chloroplast membranes in chilling tolerance.
日本植物生理学会の論文