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Infection intensity, spore density and inoculum potential of arbuscular mycorrhizal fungi decrease during secondary succession in tropical Brazilian ecosystems

Published online by Cambridge University Press:  29 August 2012

Waldemar Zangaro ,
Adrielly Pereira Ansanelo ,
Luis Eduardo Azevedo Marques Lescano ,
Ricardo de Almeida Alves ,
Artur Berbel Lírio Rondina  and
Marco Antonio Nogueira
Waldemar Zangaro*
Affiliation:
Universidade Estadual de Londrina, Centro de Ciências Biológicas, Departamento de Biologia Animal e Vegetal, Programa de Pós-Graduação em Ciências Biológicas, 86051-990, Londrina, PR, Brazil
Adrielly Pereira Ansanelo
Affiliation:
Universidade Estadual de Londrina, Centro de Ciências Biológicas, Departamento de Biologia Animal e Vegetal, Programa de Pós-Graduação em Ciências Biológicas, 86051-990, Londrina, PR, Brazil
Luis Eduardo Azevedo Marques Lescano
Affiliation:
Universidade Estadual de Londrina, Centro de Ciências Biológicas, Programa de Pós-Graduação em Microbiologia, 86051-990, Londrina, PR, Brazil
Ricardo de Almeida Alves
Affiliation:
Universidade Estadual de Londrina, Centro de Ciências Biológicas, Departamento de Biologia Animal e Vegetal, Programa de Pós-Graduação em Ciências Biológicas, 86051-990, Londrina, PR, Brazil
Artur Berbel Lírio Rondina
Affiliation:
Universidade Estadual de Londrina, Centro de Ciências Biológicas, Departamento de Biologia Animal e Vegetal, Programa de Pós-Graduação em Ciências Biológicas, 86051-990, Londrina, PR, Brazil
Marco Antonio Nogueira
Affiliation:
Universidade Estadual de Londrina, Centro de Ciências Biológicas, Programa de Pós-Graduação em Microbiologia, 86051-990, Londrina, PR, Brazil
*
1Corresponding author. Email: wzangaro@uel.br
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Abstract:

Little is known about the relationship involving arbuscular mycorrhizal (AM) fungi and functional groups of plants that characterize different phases of tropical succession. We appraised the AM infection intensity of root cortex and spore density in the soil in sites over tropical successional gradients (grassland, secondary forest and mature forest) for several years in Araucaria, Atlantic and Pantanal ecosystems in Brazil. The intensity of AM infection decreased with advancing successional stages in all ecosystems and it was around 60–80% in early stages of succession, 37–56% in secondary forests and 19–29% in mature forests. Similarly, the AM spore number also decreased with advancing succession and was the highest in early stages (73–123 g−1), intermediate in secondary forests (32–54 g−1) and lowest in the mature forests (10–23 g−1). To verify whether such reductions influenced the potential of AM inoculum in soil, seedlings of Heliocarpus popayanensis (Malvaceae) were grown as test plants in soils obtained from five grasslands, five young secondary forests, and five mature forests in the Atlantic ecosystem. The soil inocula from the grasslands and secondary forests were 7.6 and 5.7 times more effective in stimulating seedling growth than inocula from the mature forests, respectively. Our results show that plant species in grasslands and young secondary forests stimulate the multiplication of AM fungi, leading to a higher potential of the AM inoculum. In later-successional stages, plant investment in AM fungi decreases and the potential of the AM inoculum is also reduced.

Keywords

grasslandplant functional groupsroot infectionsecondary forestsoil fertilitysuccession continuumsymbiosestropical forest
Type
Research Article
Information
Journal of Tropical Ecology , Volume 28 , Issue 5 , September 2012 , pp. 453 - 462
Copyright
Copyright © Cambridge University Press 2012

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