High aluminum concentration and initial establishment of Handroanthus impetiginosus : clues about an Al non-resistant species in Brazilian Cerrado  

作　　者：Ane Marcela das Chagas Mendon ca Jean Marcel Sousa Lira Ana Luiza de Oliveira Vilela Daniel Amorim Vieira Nayara Cristina de Melo Joao Paulo Rodrigues Alves Delfi no Barbosa 

机构地区：[1]Programa de Pós-Graduacao em Fisiologia Vegetal,Departamento de Biologia,Universidade Federal de Lavras,Lavras,MG 37200-000,Brazil [2]Programa de Pós-Graduacao em Ciências Ambientais,Instituto de Ciências Exatas,Universidade Federal de Alfenas,Alfenas,MG 37130-001,Brazil [3]Programa de Pós-Graduacao em Fitotecnia,Departamento de Agricultura,Universidade Federal de Lavras,Lavras,MG 37200-000,Brazil [4]Instituto Federal de Educacao Ciência e Tecnologia do Pará,Belém,PA 66093-020,Brazil

出　　处：《Journal of Forestry Research》2020年第6期2075-2082,共8页林业研究（英文版）

基　　金：This study was financed in part by the Coordenacao de Aperfeicamento de Pessoal de Nível Superior-Brazil(CAPES)-Financial Code 001 and the Conselho Nacional de Desenvolvimento Científicoe Tecnológico-Brazil(CNPq)by providing scholarship for the authors.

摘　　要：Cerrado soils are acidic and nutrient-poor,with high content of solubilized Al 3+.Plants growing in these conditions may display adaptations to cope with high aluminum concentrations especially during early developmental stages.We investigated leaf nutritional status,and photosynthetic and growth characteristics during the initial establishment of Handroanthus impetiginosus(Mart.Ex Dc.)Mattos,a secondary tree species distributed in the Brazilian Cerrado.Our goal was to understand leaf-level traits related to diff erent aluminum concentrations.H.impetiginosus plants were cultivated in four diff erent aluminum sulfate concentrations:0,1,2,and 4 mM Al,for 40 days.We performed analyses of growth,leaf gas exchange,chloroplast pigment content,and leaf mineral nutrients.We observed a linear increase of Al leaf content as a function of Al concentration in the nutrient solution.Plants grown in 1 mM Al showed a remarkable increase of K leaf content,net photosynthesis,stomatal conductance,and transpiration,while in 4 mM Al there were reductions of N,P,and K contents,gas exchange characteristics,and height.H.impetiginosus did not have mechanisms of avoidance,compartmentalization,or resistance to high Al concentrations.Indeed,this species showed a hormetic response,with low Al concentrations stimulating and high Al concentrations inhibiting plant responses.

关 键 词：HORMESIS Low Al concentration Al toxicity Cerrado species Carbon assimilation 

分 类 号：S792.99[农业科学—林木遗传育种]