Absence of aluminium compromises root integrity, reduces leaf hydration and Rubisco performance in Qualea grandiflora, an Al-accumulating species

Autor(es)

Silva, G. S. ; Rodrigues, J. S. ; Carvalho, B. M. d. O. ; Gavassi, M. A. ; Bressan, A. C. G. ; Habermann, G.

• Tipo de documento: Artigo Científico
• Fonte: Plant Biology; v. 25, n. 5, p. 10-pg., 2023-05-31.

Resumo

Aluminium (Al) is toxic to most plants. Nevertheless, some species accumulate Al without showing toxicity symptoms. Previous studies have evidenced Al in chloroplasts of Al-accumulating species from the Cerrado vegetation in South America. We ask whether Al increases carbon assimilation through enhanced apparent efficiency of Rubisco. Seedlings of the Al-accumulator Qualea grandiflora (Vochysiaceae) were grown in nutrient solution with 0, 740, and 1480 mu M Al. Growth parameters, relative leaf water content, Al concentration in organs, gas exchange and apparent carboxylation efficiency (measured from A/Ci curves) were evaluated for 60 days. Plants without Al showed no root growth, necrotic roots, low gas exchange rates, and decreased apparent carboxylation efficiency. Al-treated plants, however, showed new white roots and increased root biomass leading to higher leaf hydration, and apparent carboxylation efficiency was higher in these plants. Increased Al available in the nutrient solution increased Al accumulation in plant organs. Absence of Al compromised root integrity in Q. grandiflora, thus limiting leaf hydration. No positive direct effect of Al on Rubisco was evidenced in Al-treated plants. (AU)

• Processo FAPESP: 18/15359-8 - Efeitos diretos do Al em folhas de espécies sensíveis e acumuladoras e papel do Al em raízes de espécies acumuladoras
• Beneficiário: Brenda Mistral de Oliveira Carvalho
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 18/08902-7 - Sinalização do ABA para o fechamento estomático sob estresse por Al
• Beneficiário: Marina Alves Gavassi
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 17/26144-0 - Aspectos hidráulicos, metabólicos e moleculares da interferência do Al3+ na hidratação da parte aérea em Citrus limonia
• Beneficiário: Gustavo Habermann
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 15/25409-4 - Papel do ABA nas relações hídricas em metabolismos contrastantes à sensibilidade ao Al3+
• Beneficiário: Marina Alves Gavassi
• Modalidade de apoio: Bolsas no Brasil - Doutorado