An overview of oxygen transport in plants: diffusion and convection.
Aerenchyma
diffusion
oxygen
pressurized flow
roots
tissue aeration
Journal
Plant biology (Stuttgart, Germany)
ISSN: 1438-8677
Titre abrégé: Plant Biol (Stuttg)
Pays: England
ID NLM: 101148926
Informations de publication
Date de publication:
Oct 2023
Oct 2023
Historique:
received:
11
04
2023
accepted:
27
06
2023
medline:
21
9
2023
pubmed:
6
7
2023
entrez:
6
7
2023
Statut:
ppublish
Résumé
The movement of gases within plants is crucial for species that live in flood-prone areas with limited soil oxygen. These plants adapt to hypoxia/anoxia not by using oxygen more efficiently, but by ensuring a steady oxygen supply to their cells. Wetland plants typically form gas-filled spaces (aerenchyma) in their tissues, providing a low-resistance pathway for gas movement between shoots and roots, especially when the shoots are above water, and the roots are submerged. Oxygen movement in plant roots is mainly through diffusion. However, in certain species, such as emergent and floating-leaved plants, pressurized flows can also facilitate the movement of gases within their stems and rhizomes. Three types of pressurized (convective) flows have been identified: humidity-induced pressurization (positive pressure), thermal osmosis (positive pressure with air flow against the heat gradient), and venturi-induced suction (negative pressure) caused by wind passing over broken culms. A clear diel variation in pressurized flows exists, with higher pressures and flows during the day and negligible pressures and flows during the night. This article discusses some key aspects of these mechanisms for oxygen movement.
Substances chimiques
Gases
0
Oxygen
S88TT14065
Types de publication
Journal Article
Review
Langues
eng
Sous-ensembles de citation
IM
Pagination
842-847Informations de copyright
© 2023 German Society for Plant Sciences and the Royal Botanical Society of the Netherlands.
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