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. 1987 May;84(1):12–18. doi: 10.1104/pp.84.1.12

Low Temperature Development Induces a Specific Decrease in trans-Δ3-Hexadecenoic Acid Content which Influences LHCII Organization 1

Norman P A Huner 1,2,3,4, Marianna Krol 1,2,3,4, John P Williams 1,2,3,4, Ellen Maissan 1,2,3,4, Phillip S Low 1,2,3,4, Dane Roberts 1,2,3,4, John E Thompson 1,2,3,4
PMCID: PMC1056519  PMID: 16665384

Abstract

Lipid and fatty acid analyses were performed on whole leaf extracts and isolated thylakoids from winter rye (Secale cereale L. cv Puma) grown at 5°C cold-hardened rye (RH) and 20°C nonhardened rye (RNH). Although no significant change in total lipid content was observed, growth at low, cold-hardening temperature resulted in a specific 67% (thylakoids) to 74% (whole leaves) decrease in the trans-Δ3-hexadecenoic acid (trans-16:1) level associated with phosphatidyldiacylglycerol (PG). Electron spin resonance and differential scanning calorimetry (DSC) indicated no significant difference in the fluidity of RH and RNH thylakoids. Separation of chlorophyll-protein complexes by sodium dodecyl sulfate-polyacrylamide gel electrophoresis indicated that the ratio of oligomeric light harvesting complex:monomeric light harvesting complex (LHCII1:LHCII3) was 2-fold higher in RNH than RH thylakoids. The ratio of CP1a:CP1 was also 1.5-fold higher in RNH than RH thylakoids. Analyses of winter rye grown at 20, 15, 10, and 5°C indicated that both, the trans-16:1 acid levels in PG and the LHCII1:LHCII3 decreased concomitantly with a decrease in growth temperature. Above 40°C, differential scanning calorimetry of RNH thylakoids indicated the presence of five major endotherms (47, 60, 67, 73, and 86°C). Although the general features of the temperature transitions observed above 40°C in RH thylakoids were similar to those observed for RNH thylakoids, the transitions at 60 and 73°C were resolved as inflections only and RH thylakoids exhibited transitions at 45 and 84°C which were 2°C lower than those observed in RNH thylakoids. Since polypeptide and lipid compositions of RH and RNH thylakoids were very similar, we suggest that these differences reflect alterations in thylakoid membrane organization. Specifically, it is suggested that low developmental temperature modulates LHCII organization such that oligomeric LHCII predominates in RNH thylakoids whereas a monomeric or an intermediate form of LHCII predominates in RH thylakoids. Furthermore, we conclude that low developmental temperature modulates LHCII organization by specifically altering the fatty composition of thylakoid PG.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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