Effect of ABA on the Activity of Mitochondrial Membrane Bound Na+-K+ ATPase

Abstract

Abstract: Effect of ABA on the activity of mitochondrial membrane bound Na+-K+ATPase during isolation of mitochondria from soybean cotyledons, there was an increased activity of the mitochondrial membrane bound Na+-K+ATPase if abscisic acid (ABA) was added to the medium when soybean seedling were grown at 27 ℃ or 16℃, 40 mol/L ABA could change the turning point temperature of Arrhenius the activation energies (Ea) of Na+-K+ATPase from 36.6℃ or 22.7℃ decreased to 30. 3℃ or 17.8℃ respectively. The Km value and S0.5 value for this enzyme with ABA was higher than that without ABA. Hill coefficient (n) of this enzyme with ABA was 1.01 and without ABA was 1.89. The o2 uptake of mitochondria also increased. These results showed that the temperature of phase transition of mitochondrial membrane were decreased by ABA treatment.

Key words: Seybean, Abscisic acid, Mitochondria, Na+-K+ATPase, Membrane phase transition

Chen Kao-shan and Zhou Xie. Effect of ABA on the Activity of Mitochondrial Membrane Bound Na+-K+ ATPase[J]. J Integr Plant Biol., 1995, 37(5): -.

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Effect of ABA on the Activity of Mitochondrial Membrane Bound Na+-K+ ATPase

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