ALUMINUM REDUCES PHOTOSYNTHETIC RESPONSES WHEN APPLIED DIRECTLY ON LEAVES

Brenda Mistral de Oliveira Carvalho; Giselle Schwab Silva; Gustavo Habermann

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Submission

Paper Title

ALUMINUM REDUCES PHOTOSYNTHETIC RESPONSES WHEN APPLIED DIRECTLY ON LEAVES

Authors

Brenda Mistral de Oliveira Carvalho
Giselle Schwab Silva
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/512706-aluminum-reduces-photosynthetic-responses-when-applied-directly-on-leaves

ISBN

978-65-5941-830-5

Keywords

Al leaf-absortion, Al sensitivity, Al toxicity, Al transport, Rangpur lime

Summary

The first and most conspicuous symptom of aluminum (Al) toxicity is the inhibition of root growth, which can occur within hours. Aluminum decreases shoot growth and reduces gas exchange rate and photochemical performance. Some studies suggest Al causes indirect (long distance) damage in the shoots through water deficiency, a consequence of the low root growth. However, direct Al effect on the leaves of sensitive plants was never tested. Here we cultivated Citrus x limonia (‘Rangpur’ lime) in nutrient solution without Al and sprayed AlCl3 solution containing 7.4, 14.8 e 37 mM Al on the shoots, every day for 60 days. We also sprayed deionized water and CaCl2 containing 11.1, 22.2, and 55.5 mM Cl as controls. The pH of all solutions was adjusted to 5.5. After 0, 1, 3, 5, 10, 20, 40, and 60 days, we measured photosynthetic responses, root and shoot length and the number of leaves. Root, shoot, and leaf biomass, leaf area, and Al concentration ([Al]) in plant organs were measured at 0 and 60 days. Plants sprayed with AlCl3 showed the same root growth and [Al] in plant organs, except for plants sprayed with 37 mM Al, which showed higher [Al] in the roots. Plants sprayed with AlCl3 showed reduced shoot development in relation to plants not sprayed with AlCl3. Gas exchange rates and photochemical performance were lower in leaves sprayed with AlCl3 in relation to plants sprayed with CaCl2 or water. Our results indicate that Al can reduce shoot development and photosynthetic responses when applied directly on leaves. The transport of Al from leaves to roots that we observed is intriguing and suggests Al can be redistributed even when absorbed by the leaves.

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

CARVALHO, Brenda Mistral de Oliveira; SILVA, Giselle Schwab; HABERMANN, Gustavo. ALUMINUM REDUCES PHOTOSYNTHETIC RESPONSES WHEN APPLIED DIRECTLY ON LEAVES.. 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/512706-ALUMINUM-REDUCES-PHOTOSYNTHETIC-RESPONSES-WHEN-APPLIED-DIRECTLY-ON-LEAVES. Access in: 01/05/2025