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Nitric Oxide and Plant Hemoglobins Improve the Tolerance of Plants to Hypoxia

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Nitric Oxide Action in Abiotic Stress Responses in Plants

Abstract

Hemoglobins (Hbs) are heme proteins that are found in most organisms and they have the property to react with O2, CO, and NO. Their structure, size, and function are quite diverse among the different organisms. In plants, three different types of hemoglobins were found: symbiotic (sHb), nonsymbiotic (nsHb), and truncated hemoglobins (trHb). Nonsymbiotic hemoglobins are divided into two classes: class 1 hemoglobins (nsHb-1s), which have a very high affinity for oxygen, and class 2 hemoglobins (nsHb-2s), which have lower affinity for oxygen and are similar to the sHbs. nsHb-1s are expressed under hypoxia and were found to improve the tolerance of plants to hypoxia and maintain the energy status of the plant cells. Class 1 nsHbs improve the tolerance of plants to hypoxia and provide an alternative type of respiration to mitochondrial electron transport. Therefore, nsHb-1 possibly acts as NO dioxygenase in the nsHb/NO cycle which consumes NADH and maintains ATP levels via an as yet unknown mechanism. However, other possible functions of nsHbs cannot be precluded as Hbs have many different functions in other organisms.

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Authors and Affiliations

  1. Faculty of Agriculture, Forestry and Natural Environment, Laboratory of Agronomy, Aristotle University of Thessaloniki, University Campus, 54124, Thessaloniki, Greece

    Christos Dordas

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Editors and Affiliations

  1. Faculty of Science, Department of Biology, University of Tabuk, Tabuk, Saudi Arabia

    M. Nasir Khan

  2. Faculty of Science, Department of Biology, University of Tabuk, Tabuk, Saudi Arabia

    Mohammad Mobin

  3. Department of Botany, Aligarh Muslim University, Aligarh, India

    Firoz Mohammad

  4. Departamento de Bioquímica Biol. Cellular y Molecular de Plantas, Estación Experimental del Zaidín, Granada, Spain

    Francisco J. Corpas

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Dordas, C. (2015). Nitric Oxide and Plant Hemoglobins Improve the Tolerance of Plants to Hypoxia. In: Khan, M., Mobin, M., Mohammad, F., Corpas, F. (eds) Nitric Oxide Action in Abiotic Stress Responses in Plants. Springer, Cham. https://doi.org/10.1007/978-3-319-17804-2_7

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