Aerenchyma formation in the wetland plant Juncus effusus is independent of ethylene
Article first published online: 17 MAY 2006
Volume 171, Issue 2, pages 305–314, July 2006
How to Cite
Visser, E. J. W. and Bögemann, G. M. (2006), Aerenchyma formation in the wetland plant Juncus effusus is independent of ethylene. New Phytologist, 171: 305–314. doi: 10.1111/j.1469-8137.2006.01764.x
- Issue published online: 17 MAY 2006
- Article first published online: 17 MAY 2006
- Received: 7 February 2006 Accepted: 24 March 2006
- constitutive aerenchyma;
- ethylene insensitivity;
- Juncus effusus;
- programmed cell death;
- root elongation;
- soil flooding;
- Zea mays (maize)
- • Flooded plant roots commonly form aerenchyma, which allows gas diffusion between shoots and roots. The programmed cell death involved in this induced aerenchyma formation is controlled by the plant hormone ethylene, as has been shown for maize (Zea mays). However, the role of ethylene is uncertain in wetland species that form constitutive aerenchyma (also under nonflooded conditions). The aim of this study is to shed light on the involvement of ethylene in constitutive aerenchyma formation in Juncus effusus.
- • Plants of J. effusus and maize were treated with ethylene and inhibitors of ethylene action to determine the consequences for aerenchyma formation.
- • Neither treatment with high ethylene concentrations nor with ethylene inhibitors resulted in changes in root aerenchyma in J. effusus. By contrast, ethylene increased aerenchyma development in maize unless ethylene action inhibitors were applied simultaneously. Similarly, root elongation was insensitive to ethylene treatment in J. effusus, but was affected negatively in maize.
- • The data show that aerenchyma in J. effusus is highly constitutive and, in contrast to the inducible aerenchyma in maize, is not obviously controlled by ethylene.