Low Temperature Treatments Induce an Increase in the Relative Content of Both Linolenic and △^3-trans-Hexadecenoic Acids in Thylakoid Membrane Phosphatidylglycerol of Squash Cotyledons

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概要

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• The effect of low temperatures on the fatty acid corn-position of phosphatidylglycerol (PG) in thylakoid membranes, in particular on the ratios of nmol% 16:1(3t) (mg fresh weight)^<-1> of cotyledons and nmol 16:1(3t) (mg chlorophyll)^<-1> were measured during squash seedling growth. Plants were germinated and grown for one day at 30℃, then were either kept at 30℃ (control plants) or transferred to low temperatures (18, 14 or 10℃). When plants were transferred from 30℃ to low temperatures, the increase in fresh weight was gradually limited. The lower the temperature, the smaller was the fresh weight. In contrast, the relative content of 16:1(3t) and 18:3, as well as the ratios of nmol 16:1(3t) (mg chlorophyll)^<-1> and mol% 16:1(3t) (mg cotyledon fresh weight)^<-1> increased indicating that the increase of fresh weight and chlorophyll was more sensitive to low temperature than PG desaturation in thylakoid membranes. Furthermore, low temperatures induced an increase in 16:1(3t) and 18:3 (the final products of PG synthesis) at the expense of 16:0 and 18:1 (the initial products of PG synthesis). However, within a range of temperature from 10 to 18℃, the extent of these changes (nmol% of 18:3 or 16:1(3t) per day) was gradually limited by lower temperatures. We therefore propose that low temperatures inhibit both fatty acid synthesis and desaturation activities. However, at low temperatures the fatty acid synthesis is likely to be more strongly inhibited than the desaturation activities, thus explaining the observed increase in the relative content of PG-18:3 and PG-16:1(3t). Results are discussed in terms of the mechanism which could be involved in the metabolism of PG in squash cotyledons.

• 日本植物生理学会の論文
• 1997-05-00

著者

• Siegenthaler Paul-andre

  Laboratoire De Physiologie Vegetable Et Biochimie Universite

• Xu Yinong

  Laboratoire de Physiologie vegetale, Universite de Neuchatel

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• Effect of Non-Chilling Temperature and Light Intensity during Growth of Squash Cotyledons on the Composition of Thylakoid Membrane Lipids and Fatty Acids
• Low Temperature Treatments Induce an Increase in the Relative Content of Both Linolenic and △^3-trans-Hexadecenoic Acids in Thylakoid Membrane Phosphatidylglycerol of Squash Cotyledons

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