Tolerant mechanisms to O2 deficiency under submergence conditions in plants

Wetland plants can tolerate long-term strict hypoxia and anoxic conditions and the subsequent re-oxidative stress compared to terrestrial plants. During O 2 deficiency, both wetland and terrestrial plants use NAD(P) + and ATP that are produced during ethanol fermentation, sucrose degradation, and ma...

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Bibliographic Details
Published in:	Journal of plant research Vol. 133; no. 3; pp. 343 - 371
Main Authors:	Nakamura, Motoka, Noguchi, Ko
Format:	Journal Article
Language:	English
Published:	Singapore Springer Singapore 01.05.2020 Springer Nature B.V
Subjects:	Acclimation Acclimatization adenosine triphosphate aerenchyma Amino acids ammonium anaerobic conditions Anoxia Anoxic conditions Biomedical and Life Sciences Carbohydrates Current Topics in Plant Research Electron transport electron transport chain Elongation Ethanol ethanol fermentation Fermentation Hypoxia leaves Life Sciences Mitochondria NAD NAD (coenzyme) NADH NADP (coenzyme) Nicotinamide adenine dinucleotide nitrates Nitrification nitrogen Nitrogen dioxide Oxidation Oxidative stress oxygen Oxygen consumption Plant Biochemistry Plant Ecology Plant hormones Plant Physiology Plant Sciences Roots soil Submergence Sucrose Sugar wetland plants Wetlands Low O Anoxia escape and low O quiescence strategies (LOES and LOQS) Nitrogen acquisition strategy Wetland plants Re-oxidative stress Hypoxia Respiration
ISSN:	0918-9440, 1618-0860, 1618-0860
Online Access:	Get full text
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Summary:	Wetland plants can tolerate long-term strict hypoxia and anoxic conditions and the subsequent re-oxidative stress compared to terrestrial plants. During O 2 deficiency, both wetland and terrestrial plants use NAD(P) + and ATP that are produced during ethanol fermentation, sucrose degradation, and major amino acid metabolisms. The oxidation of NADH by non-phosphorylating pathways in the mitochondrial respiratory chain is common in both terrestrial and wetland plants. As the wetland plants enhance and combine these traits especially in their roots, they can survive under long-term hypoxic and anoxic stresses. Wetland plants show two contrasting strategies, low O 2 escape and low O 2 quiescence strategies (LOES and LOQS, respectively). Differences between two strategies are ascribed to the different signaling networks related to phytohormones. During O 2 deficiency, LOES-type plants show several unique traits such as shoot elongation, aerenchyma formation and leaf acclimation, whereas the LOQS-type plants cease their growth and save carbohydrate reserves. Many wetland plants utilize NH 4 + as the nitrogen (N) source without NH 4 + -dependent respiratory increase, leading to efficient respiratory O 2 consumption in roots. In contrast, some wetland plants with high O 2 supply system efficiently use NO 3 − from the soil where nitrification occurs. The differences in the N utilization strategies relate to the different systems of anaerobic ATP production, the NO 2 − -driven ATP production and fermentation. The different N utilization strategies are functionally related to the hypoxia or anoxia tolerance in the wetland plants.
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ISSN:	0918-9440 1618-0860 1618-0860
DOI:	10.1007/s10265-020-01176-1