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  1. Vol. 11 No. 3, p. 351-354
     
    Received: June 25, 1970
    Published: May, 1971


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doi:10.2135/cropsci1971.0011183X001100030012x

Oxidation and Phosphorylation By Mitochondria Isolated From Iron-sufficient and Iron-deficient Corn Roots

  1. Helen H. Young and
  2. A. Wallace1

Abstract

Abstract

Active mitochondria were successfully isolated from roots of Fe-deficient and Fe-sufficient corn (Zea mays L.) plants. Citrate, DL-isocitrate, α-ketoglutarate, succinate, L-malate, and NADH were oxidized by the mitochondria from either kind of corn plant. Fe-deficient root mitochondria had decreased O2 uptake and oxidative phosphorylation as compared to those of Fe-sufficient root mitochondria. Furthermore, mitochondrla from Fe-deficient corn roots had a low respiratory control ratio and the O2 uptake had little response to the addition of ADP. Measurements of NADH oxidation by a spectrophotometric method showed that Fe-deficient root mitochondria reduced the affinity between substrate and the nonheme Fe enzyme (NADH dehydrogenase).

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