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    Changes in γ-aminobutyric acid concentration, gas exchange, and leaf anatomy in Eucalyptus clones under drought stress and rewatering


    Shinkai Gentil Otto, Marina and Francisco, Jeane Gisele and Teixeira Gonsalez, Beatriz and de Almeida Calvo, Lara and Moré de Mattos, Eduardo and de Almeida, Marcílio and de Andrade Moral, Rafael and Garcia Borges Demétrio, Clarice and Stape, José Luiz and Ferraz de Oliveira, Ricardo (2017) Changes in γ-aminobutyric acid concentration, gas exchange, and leaf anatomy in Eucalyptus clones under drought stress and rewatering. Acta Physiologiae Plantarum, 39 (208). ISSN 0137-5881

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    Abstract

    Drought stress promotes biochemical and physiological alterations in plant metabolism that limit growth and yield. This study investigated the accumulation of γ-aminobutyric acid (GABA) in plant tissue, the stomatal conductance (gs) and changes in leaf anatomy in Eucalyptus following drought stress situation. In this study, eight Eucalyptus clones were evaluated under normal water supply (control) and drought stress conditions (stress). For the control treatment, plants were irrigated every day with an automated system until the soil was saturated, and for the stress treatment, drought stress was imposed by non-irrigation of plants, and pots were covered using plastic sheeting to avoid rainfall and humidity. This study has shown that: (1) all clones decreased gs with increasing vapor pressure deficit (D) in both treatments. All plastics and drought-tolerant clones (except GG) presented lower stomatal sensitivity to D under stress conditions than drought-sensitive clones; (2) GABA concentrations increased fast after drought stress, but we could not find correlation with these changes and resistance to water stress; and (3) all clones increased the number of stomata and reduced leaf thickness after water stress. The finding is that GABA is a fast stress-signaling molecule in Eucalyptus, but the response of gs to D is a best physiological variable to differentiate drought-tolerant and drought-sensitive Eucalyptus clones.

    Item Type: Article
    Additional Information: Cite as: Otto, M.S.G., Francisco, J.G., Gonsalez, B.T. et al. Acta Physiol Plant (2017) 39: 208. https://doi.org/10.1007/s11738-017-2507-5
    Keywords: GABA; Stomatal conductance; Water stress; Recovery;
    Academic Unit: Faculty of Science and Engineering > Mathematics and Statistics
    Item ID: 11435
    Identification Number: https://doi.org/10.1007/s11738-017-2507-5
    Depositing User: Rafael de Andrade Moral
    Date Deposited: 21 Oct 2019 16:19
    Journal or Publication Title: Acta Physiologiae Plantarum
    Publisher: Springer
    Refereed: Yes
    URI:

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