Fatty acid composition of mitochondrial membranes of pea germs exposed to insufficient watering and treated with organophosphorous plant growth regulator |
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| Authors: | I V Zhigacheva T A Misharina M B Terenina N N Krikunova E B Burlakova I P Generozova A G Shugaev S G Fattakov |
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| Institution: | 1.Emanuel Institute of Biochemical Physics,Russian Academy of Sciences,Moscow,Russia;2.Timiryazev Institute of Plant Physiology,Russian Academy of Sciences,Moscow,Russia;3.Arbuzov Institute of Organic and Physical Chemistry, Kazan’ Research Center,Russian Academy of Sciences,Kazan’,Russia |
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| Abstract: | The influence of insufficient watering and a melamine salt of bis(oxymethyl)-phosphonic acid (melaphen) on fatty acid composition
of mitochondrial membrane of pea seedlings has been studied. It is shown that insufficient watering results in a 1.57-fold
decrease in the ratio of unsaturated to saturated C18 fatty acids and in a 3.04-fold decrease in the ratio of unsaturated to saturated C20 fatty acids. The modification of fatty acid composition of mitochondrial membranes was associated with the alterations in
their functional state: maximal rates of oxidation of NAD-dependent substrates and the rates of electron transport at the
end of respiratory chain decreased. A preliminary treatment of the seeds with 3 × 10−9 M melaphen restored the maximal rates of oxidation of NAD-dependent substrates to the control values. We suggest that the
alterations of the electron transport rates in respiratory chain in mitochondria are related to the physicochemical state
of the membranes of these organelles, as the treatment with melaphen prevented the changes in fatty acid composition of the
membranes of seedlings growing under the conditions of insufficient watering. |
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