Root aeration in rice (Oryza sativa): evaluation of oxygen, carbon dioxide, and ethylene as possible regulators of root acclimatizations
Open Access
- 7 April 2006
- journal article
- Published by Wiley in New Phytologist
- Vol. 170 (4), 767-778
- https://doi.org/10.1111/j.1469-8137.2006.01725.x
Abstract
• Adventitious roots of rice (Oryza sativa) acclimatize to root‐zone O2 deficiency by increasing porosity, and induction of a barrier to radial O2 loss (ROL) in basal zones, to enhance longitudinal O2 diffusion towards the root tip. • Changes in root‐zone gas composition that might induce these acclimatizations, namely low O2, elevated ethylene, ethylene—low O2 interactions, and high CO2, were evaluated in hydroponic experiments. • Neither low O2 (0 or 0.028 mol m−3 O2), ethylene (0.2 or 2.0 µl l−1), or combinations of these treatments, induced the barrier to ROL. This lack of induction of the barrier to ROL was despite a positive response of aerenchyma formation to low O2 and elevated ethylene. Carbon dioxide at 10 kPa had no effect on root porosity, the barrier to ROL, or on growth. • Our findings that ethylene does not induce the barrier to ROL in roots of rice, even though it can enhance aerenchyma formation, shows that these two acclimatizations for improved root aeration are differentially regulated.Keywords
This publication has 39 references indexed in Scilit:
- Conditions Leading to High CO2 (>5 kPa) in Waterlogged–Flooded Soils and Possible Effects on Root Growth and MetabolismAnnals of Botany, 2006
- Long‐distance transport of gases in plants: a perspective on internal aeration and radial oxygen loss from rootsPlant, Cell & Environment, 2003
- Changes in growth, porosity, and radial oxygen loss from adventitious roots of selected mono‐ and dicotyledonous wetland species with contrasting types of aerenchymaPlant, Cell & Environment, 2000
- Formation of Aerenchyma and the Processes of Plant Ventilation in Relation to Soil Flooding and SubmergencePlant Biology, 1999
- Elongation by primary lateral roots and adventitious roots during conditions of hypoxia and high ethylene concentrationsPlant, Cell & Environment, 1997
- Ethylene accumulation in waterloggedRumexplants promotes formation of adventitious rootsJournal of Experimental Botany, 1996
- Aerenchyma formation and associated oxygen movement in seminal and nodal roots of wheatPlant, Cell & Environment, 1990
- THE ANATOMICAL CHARACTERISTICS OF ROOTS AND PLANT RESPONSE TO SOIL FLOODINGNew Phytologist, 1987
- Aerenchyma (Gas-space) Formation in Adventitious Roots of Rice (Oryza sativaL.) is not Controlled by Ethylene or Small Partial Pressures of OxygenJournal of Experimental Botany, 1985
- Radial Oxygen Losses from Intact Rice Roots as Affected by Distance from the Apex, Respiration and WaterloggingPhysiologia Plantarum, 1971