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Aerenchyma, gas diffusion, and catalase activity in Typha domingensis: a complementary model for radial oxygen loss

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Abstract

Radial oxygen loss is a physical phenomenon that occurs naturally in aquatic plants. Typha domingensis was chosen as a model plant because it possesses basic morphological characteristics, such as a stem (rhizome) that produces leaves and adventitious roots, which are present in many aquatic plants. This study aimed to evaluate the following: the relevance of the anatomy of T. domingensis on gas diffusion among organs; the influence of plant parts on radial oxygen loss; the role of catalase in radial oxygen loss; and the proposition of a novel explanation for the downward diffusion of oxygen through the organs of this aquatic macrophyte and into the environment. Typha domingensis plants were cultivated in a greenhouse under different conditions: plants with intact leaves, plants with leaves cut in half, and plants without leaves. Furthermore, we evaluated the percentage of aerenchyma in different vegetative organs, the minimum pressure required for radial oxygen loss, the daily variations of dissolved oxygen, and the roots’ catalase activity. The results demonstrated that certain cellular features contributed to decreased oxygen diffusion among the organs, specifically, those found in the leaf-rhizome and root-rhizome interfaces as well as the suberin and lignin layers in these regions. Additionally, our experiments with a catalase activator and inhibitor validated that a significant amount of the oxygen released in radial oxygen loss could not, in fact, be exclusively supplied by the atmosphere. Thus, a complementary model is proposed in which catalase activity is an important component of radial oxygen loss.

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The authors thank CNPq [Conselho Nacional de Desenvolvimento Científico e Tecnológico (National Counsel of Technological and Scientific Development)], CAPES [Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Coordination for the Improvement of Higher Education Personnel)], and FAPEMIG [Fundação de Amparo à Pesquisa do estado de Minas Gerais (Minas Gerais State Research Foundation)] for funding and research grants awarded to complete the present study.

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Correspondence to Fabricio J. Pereira.

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The authors declare that they have no conflicts of interest.

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Handling Editor: Muhammad Mujtaba

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Duarte, V.P., Pereira, M.P., Corrêa, F.F. et al. Aerenchyma, gas diffusion, and catalase activity in Typha domingensis: a complementary model for radial oxygen loss. Protoplasma 258, 765–777 (2021). https://doi.org/10.1007/s00709-020-01597-8

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  • DOI: https://doi.org/10.1007/s00709-020-01597-8

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