Internal aeration and respiration of submerged tomato hypocotyls are enhanced by ethylene-mediated aerenchyma formation and hypertrophy.

Autor: Mignolli F; Instituto de Botánica del Nordeste (IBONE), UNNE-CONICET, Corrientes, Argentina.; Facultad de Ciencias Agrarias, Universidad Nacional del Nordeste (UNNE), Corrientes, Argentina., Todaro JS; Facultad de Medicina, Universidad Nacional del Nordeste (UNNE), Corrientes, Argentina., Vidoz ML; Instituto de Botánica del Nordeste (IBONE), UNNE-CONICET, Corrientes, Argentina.; Facultad de Ciencias Agrarias, Universidad Nacional del Nordeste (UNNE), Corrientes, Argentina.
Jazyk: angličtina
Zdroj: Physiologia plantarum [Physiol Plant] 2020 May; Vol. 169 (1), pp. 49-63. Date of Electronic Publication: 2020 Feb 05.
DOI: 10.1111/ppl.13044
Abstrakt: With the impending threat that climate change is imposing on all terrestrial ecosystems, the ability of plants to adjust to changing environments is, more than ever, a very desirable trait. Tomato (Solanum lycopersicum L.) plants display a number of responses that allow them to survive under different abiotic stresses such as flooding. We focused on understanding the mechanism that facilitates oxygen diffusion to submerged tissues and the impact it has on sustaining respiration levels. We observed that, as flooding stress progresses, stems increase their diameter and internal porosity. Ethylene triggers stem hypertrophy by inducing cell wall loosening genes, and aerenchyma formation seems to involve programmed cell death mediated by hydrogen peroxide. We finally assessed whether these changes in stem morphology and anatomy are indeed effective to restore oxygen levels in submerged organs. We found that aerenchyma formation and hypertrophy not only increase oxygen diffusion toward the base of the plant, but also result in an augmented respiration rate. We consider that this response is crucial to maintain adventitious root development under such conditions and, therefore, making it possible for the plant to survive when the original roots die.
(© 2019 Scandinavian Plant Physiology Society.)
Databáze: MEDLINE
Externí odkaz: