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. 1989 Jan;89(1):144–150. doi: 10.1104/pp.89.1.144

Low Temperature-Induced Decrease in trans-Δ3-Hexadecenoic Acid Content Is Correlated with Freezing Tolerance in Cereals 1

Norman P A Huner 1,2,3, John P Williams 1,2,3, Ellen E Maissan 1,2,3, Elizabeth G Myscich 1,2,3, Marianna Krol 1,2,3, Andre Laroche 1,2,3, Jasbir Singh 1,2,3
PMCID: PMC1055810  PMID: 16666505

Abstract

The effect of growth at 5°C on the trans-Δ3-hexadecenoic acid content of phosphatidyl(d)glycerol was examined in a total of eight cultivars of rye (Secale cereale L.) and what (Triticum aestivum L.) of varying freezing tolerance. In these monocots, low temperature growth caused decreases in the trans-Δ3-hexadecenoic acid content of between 0 and 74% with concomitant increases in the palmitic acid content of phosphatidyl(d)glycerol. These trends were observed for whole leaf extracts as well as isolated thylakoids. The low growth temperature-induced decrease in the trans-Δ3-hexadecenoic acid content was shown to be a linear function (r2 = 0.954) of freezing tolerance in these cultivars. Of the six cold tolerant dicotyledonous species examined, only Brassica and Arabidopsis thaliana L. cv Columbia exhibited a 42% and 65% decrease, respectively, in trans-Δ3-hexadecenoic acid content. Thus, the relationship between the change in trans-Δ3-hexadecenoic acid content of phosphatidyl(d)glycerol and freezing tolerance cannot be considered a general one for all cold tolerant plant species. However, species which exhibited a low growth temperature-induced decrease in trans-Δ3-hexadecenoic acid also exhibited a concomitant shift in the in vitro organization of the light harvesting complex II from a predominantly oligomeric form to the monomeric form. We conclude that the proposed role of phosphatidyl(d)glycerol in modulating the organization of light harvesting complex II as a function of growth temperature manifests itself to varying degrees in different plant species. A possible physiological role for this phenomenon with respect to low temperature acclimation and freezing tolerance in cereals is discussed.

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Selected References

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