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Hemoglobin and Hypoxic Acclimation in Maize Root Tips

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Abstract

Class 1 hemoglobins (Hbs) have a wide distribution in the plant kingdom and have been demonstrated in root, seed, stem, and leaf tissues. They are present at low concentrations in aerobic tissue, but their synthesis is rapidly induced by hypoxic stress. The pattern of expression of the maize Hb gene in roots of young maize plants exposed to hypoxia has been examined. Root Hb gene expression increased rapidly to a maximum within first two hours of hypoxia, then declining to prehypoxia levels within 48-h hypoxic exposure. Limiting oxygen supply to the roots by total plant immersion and darkness did not alter the time course of hemoglobin expression. Hb gene expression was about 20-fold higher in the stele than in the cortex of control, aerobically grown roots. Stele Hb expression increased about fourfold under hypoxic conditions, whereas its expression in the cortex increased about 60-fold. In these samples, alcohol dehydrogenase (Adh) gene expression increased about four- and ten fold in the stele and cortex, respectively. The effect of the state of the Hb on anoxic survival of maize root tips was assessed by exposing root tips to a carbon monoxide atmosphere to maximize the proportion of hemoglobin in the carbonmonoxy form. Carbon monoxide had no significant effect on the survival or the ATP levels in anoxic maize roots, regardless of whether they had been acclimated by exposure to a hypoxic pretreatment. This would suggest that the presence of oxyhemoglobin is not essential for the survival of anoxic root tips.

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Authors and Affiliations

  1. Department of Plant Science, University of Manitoba, Winnipeg, Canada

    R. I. Silva-Cardenas & R. D. Hill

  2. Centre de Recherches de Bordeaux, Institut National de la Recherche Agronomique, Villenave d'Ornon, France

    B. Ricard & P. Saglio

Authors
  1. R. I. Silva-Cardenas
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  2. B. Ricard
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  3. P. Saglio
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  4. R. D. Hill
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Silva-Cardenas, R.I., Ricard, B., Saglio, P. et al. Hemoglobin and Hypoxic Acclimation in Maize Root Tips. Russian Journal of Plant Physiology 50, 821–826 (2003). https://doi.org/10.1023/B:RUPP.0000003281.33108.84

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  • DOI: https://doi.org/10.1023/B:RUPP.0000003281.33108.84

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