膜脂的不饱和性可稳定光合作用以抵御热胁迫。
The Unsaturation of Membrane Lipids Stabilizes Photosynthesis against Heat Stress.
作者信息
Gombos Z., Wada H., Hideg E., Murata N.
机构信息
Department of Regulation Biology, National Institute for Basic Biology, Myodaiji, Okazaki, 444 Japan (Z.G., H.W., N.M.).
出版信息
Plant Physiol. 1994 Feb;104(2):563-567. doi: 10.1104/pp.104.2.563.
Abstract
The effect of the unsaturation of glycerolipids of thylakoid membranes on the heat tolerance of the photosynthetic evolution of oxygen was studied in vivo by mutation and transformation of fatty-acid desaturases in the cyanobacterium Synechocystis PCC6803. The experimental results indicate that elimination of dienoic lipid molecules decreases, to a small but distinct extent, the heat tolerance of photosynthetic oxygen evolution, but that elimination of trienoic lipid molecules has no effect on the heat tolerance. This conclusion contrasts with the previous hypothesis that the heat tolerance of photosynthesis is enhanced upon an increase in the level of saturation of membrane lipids. It is also shown that light does not affect the nature of the effect of lipid unsaturation on the heat tolerance of photosynthesis.
摘要
通过对蓝藻集胞藻PCC6803中脂肪酸去饱和酶进行突变和转化，在体内研究了类囊体膜甘油脂质的不饱和度对光合放氧耐热性的影响。实验结果表明，消除二烯酸脂质分子会使光合放氧的耐热性有小但明显的降低，而消除三烯酸脂质分子对耐热性没有影响。这一结论与之前关于光合耐热性随膜脂饱和度增加而增强的假设相反。研究还表明，光不会影响脂质不饱和度对光合耐热性的影响性质。
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