Iron deficiency affects the function of respiratory chain, mainly at the complex I and complex II levels. Since plant mitochondria posses alternative NAD(P)H dehydrogenases located in the inner-membrane, oxidising NAD(P)H from both cytosol and matrix, we investigated these activities in mitochondria of Fe-deficient roots. External and internal NAD(P)H dehydrogenase activities increased in Fe-deficient mitochondria. Accordingly, NDB1 protein strongly accumulates while NDA1 does not show relevant differences in Fe-deficient roots. The data presented support, for the first time, the hypothesis that Fe deficiency induces the alternative NAD(P)H dehydrogenases bypassing the impaired complex I.
Effect of Fe deficiency on mitochondrial alternative NAD(P)H dehydrogenases in cucumber roots / G. Vigani, G. Zocchi. - In: JOURNAL OF PLANT PHYSIOLOGY. - ISSN 0176-1617. - 167:8(2010 May 15), pp. 666-669. [10.1016/j.jplph.2009.12.006]
Effect of Fe deficiency on mitochondrial alternative NAD(P)H dehydrogenases in cucumber roots
G. ViganiPrimo
;G. ZocchiUltimo
2010
Abstract
Iron deficiency affects the function of respiratory chain, mainly at the complex I and complex II levels. Since plant mitochondria posses alternative NAD(P)H dehydrogenases located in the inner-membrane, oxidising NAD(P)H from both cytosol and matrix, we investigated these activities in mitochondria of Fe-deficient roots. External and internal NAD(P)H dehydrogenase activities increased in Fe-deficient mitochondria. Accordingly, NDB1 protein strongly accumulates while NDA1 does not show relevant differences in Fe-deficient roots. The data presented support, for the first time, the hypothesis that Fe deficiency induces the alternative NAD(P)H dehydrogenases bypassing the impaired complex I.
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