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 lowresistance 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.
Striker, G. G. (2023).An overview of oxygen transport in plants : diffusion and convection.Plant Biology,25, (6),p.842-847
10.1111/plb.13558
Striker, Gustavo Gabriel.2023. "An overview of oxygen transport in plants : diffusion and convection".Plant Biology 25, no.6:842-847.
Recuperado de http://ri.agro.uba.ar/greenstone3/library/collection/arti/document/2023striker