ALUMINUM AFFECTS LEAF HYDRATION BEFORE THE INHIBITION OF ROOT GROWTH IN CITRUS X LIMONIA

Giselle Schwab Silva; Marina Alves Gavassi; Brenda Mistral de Oliveira Carvalho; Gustavo Habermann

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Submission

Paper Title

ALUMINUM AFFECTS LEAF HYDRATION BEFORE THE INHIBITION OF ROOT GROWTH IN CITRUS X LIMONIA

Authors

Giselle Schwab Silva
Marina Alves Gavassi
Brenda Mistral de Oliveira Carvalho
Gustavo Habermann

Modality

Abstract

Subject area

Plant Physiology

Publishing Date

26/09/2022

Country of Publishing

Brasil

Language of Publishing

Inglês

Paper Page

https://www.even3.com.br/anais/cbfv2022_registration/510625-aluminum-affects-leaf-hydration-before-the-inhibition-of-root-growth-in-citrus-x-limonia

ISBN

978-65-5941-830-5

Keywords

‘Mandarin’ lime, stomatal conductance, sap flow

Summary

The first symptom of aluminum (Al) toxicity is the inhibition of root growth, which has been used to explain the low leaf hydration, affecting leaf gas exchange rates, including stomatal conductance (gs). We tested whether low leaf hydration occur before or after the inhibition of root growth of Citrus x limonia (‘Mandarin’ lime) cultivated in nutrient solution with 0 and 1480 µM Al for 60 days. The sap flow (estimated gs) was measured by the heat ratio method using thermopar sensors that were placed on the main stem in five plants of each treatment. At 1, 7, 15, 30, 45 and 60 days after treatments (DAT) predawn (?pd) and midday (?md) leaf water potential, relative leaf water content (RWC), and total plant transpiration (Eplant) were measured. On the same dates, the main root length, root surface area, root diameter and root biomass were assessed. Until the end of the study (60 days), plants exposed to Al showed estimated gs and Eplant lower than control plants from 3 and 7 DAT, respectively. At 15 DAT, reduced values of ?pd and RWC were evidenced in plants exposed to Al. The length, surface area and biomass of roots of plants exposed to Al were lower than control plants only at 30 DAT. These results demonstrate, as a novelty, that leaf hydration was affected by Al exposure before root growth inhibition could be observed at 30 DAT. Therefore, the low leaf hydration in ‘Mandarin’ lime exposed to Al cannot be explained by root growth inhibition and a simple outcome of low water uptake due to the reduced root system.

Title of the Event: XVIII Brazilian Congress of Plant Physiology and I Ibero-latinoamerican Congress of Plant Biology
City of the Event: Porto Alegre
Title of the Proceedings of the event: Annals of the Brazilian Congress of Plant Physiology and Ibero-latinamerican Congress of Plant Biology
Name of the Publisher: Even3
Means of Dissemination: Meio Digital

How to cite

SILVA, Giselle Schwab et al.. ALUMINUM AFFECTS LEAF HYDRATION BEFORE THE INHIBITION OF ROOT GROWTH IN CITRUS X LIMONIA.. In: Annals of the Brazilian Congress of Plant Physiology and Ibero-latinamerican Congress of Plant Biology. Anais...Porto Alegre(RS) CEPUCRS, 2022. Available in: https//www.even3.com.br/anais/cbfv2022_registration/510625-ALUMINUM-AFFECTS-LEAF-HYDRATION-BEFORE-THE-INHIBITION-OF-ROOT-GROWTH-IN-CITRUS-X-LIMONIA. Access in: 04/10/2025