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Planta

, Volume 219, Issue 1, pp 66–72 | Cite as

Class-1 hemoglobins, nitrate and NO levels in anoxic maize cell-suspension cultures

  • Christos Dordas
  • Brian B. Hasinoff
  • Jean Rivoal
  • Robert D. HillEmail author
Original Article

Abstract

Nitric oxide (NO) is a reactive gas involved in many biological processes of animals, plants and microbes. Previous work has demonstrated that NO is formed during hypoxia in alfalfa (Medicago sativa L.) root cultures and that the levels of NO detected are inversely related to the levels of expression of class-1 hemoglobin expressed in the tissue. The objectives of this study were: to examine whether NO is produced in transgenic maize (Zea mays L.) cell-suspension cultures exposed to anoxic growth conditions; to determine whether a similar relationship existed between a class-1 hemoglobin and the amount of NO detected under these conditions; and, to estimate the route of formation and breakdown of NO in the tissue. Maize cell-suspension cultures, transformed to express the sense or antisense strands of barley hemoglobin were used to overexpress or underexpress class-1 hemoglobin. A maize cell-suspension culture transformed with an empty vector was used as a control. Up to 500 nmol NO (g FW)−1 was detected in maize cells exposed to low oxygen tensions for 24 h. The steady-state levels of NO in the different cell lines under anoxic conditions had an inverse relationship to the level of hemoglobin in the cells. There was no detectable NO produced under aerobic growth conditions. Spectroscopic data demonstrated that recombinant maize hemoglobin reacted with NO to form methemoglobin and NO3 . Nitrate was shown to be a precursor of NO in anoxic maize cell-suspension cultures by using 15NO3 and electron paramagnetic resonance spectroscopy, suggesting that NO is formed via nitrate reductase during hypoxia. The results demonstrate that NO is produced in plant tissues grown under low oxygen tensions and suggest that class-1 hemoglobins have a significant function in regulating NO levels.

Keywords

Anoxia Hemoglobin Nitric oxide Signalling Stress Zea 

Abbreviations

DEANO

2-(N,N-Diethylamino)-diazenolate-2-oxide

EPR

Electron paramagnetic resonance

Hb

Hemoglobin

MGD

N-(Dithiocarbamoyl)-N-methyl-d-glucamine

NOS

Nitric oxide synthase

WT

Wild type

Notes

Acknowledgements

This work was supported by the Natural Sciences and Engineering Research Council of Canada (R.H., Grant OGP4689) and the Canadian Institutes of Health Research (B.H.).

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Christos Dordas
    • 1
  • Brian B. Hasinoff
    • 2
  • Jean Rivoal
    • 1
  • Robert D. Hill
    • 1
    Email author
  1. 1.Department of Plant ScienceUniversity of ManitobaWinnipegCanada
  2. 2.Faculty of PharmacyUniversity of ManitobaWinnipegCanada

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