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

Autor: Silva GS; Programa de Pós-Graduação em Biologia Vegetal, Departamento de Biodiversidade, Instituto de Biociências, Universidade Estadual Paulista, UNESP, Rio Claro, SP, Brazil., Rodrigues JS; Curso de graduação em Ciências Biológicas, Departamento de Biodiversidade, Instituto de Biociências, Universidade Estadual Paulista, UNESP, Rio Claro, SP, Brazil., Carvalho BMDO; Programa de Pós-Graduação em Biologia Vegetal, Departamento de Biodiversidade, Instituto de Biociências, Universidade Estadual Paulista, UNESP, Rio Claro, SP, Brazil., Gavassi MA; Departamento de Biodiversidade, Instituto de Biociências, Universidade Estadual Paulista, UNESP, Rio Claro, SP, Brazil., Bressan ACG; Programa de Pós-Graduação em Biologia Vegetal, Departamento de Biodiversidade, Instituto de Biociências, Universidade Estadual Paulista, UNESP, Rio Claro, SP, Brazil., Habermann G; Departamento de Biodiversidade, Instituto de Biociências, Universidade Estadual Paulista, UNESP, Rio Claro, SP, Brazil.
Jazyk: angličtina
Zdroj: Plant biology (Stuttgart, Germany) [Plant Biol (Stuttg)] 2023 Aug; Vol. 25 (5), pp. 740-749. Date of Electronic Publication: 2023 May 31.
DOI: 10.1111/plb.13535
Abstrakt: 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 μm 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.
(© 2023 German Society for Plant Sciences, Royal Botanical Society of the Netherlands.)
Databáze: MEDLINE
Externí odkaz: