title: Interspecific variation of the bacterial community structure in the phyllosphere of the three major plant components of mangrove forests.
abstract: Mangrove forests encompass a group of trees species that inhabit the intertidal zones, where soil is characterized by the high salinity and low availability of oxygen. The phyllosphere of these trees represent the habitat provided on the aboveground parts of plants, supporting in a global scale, a large and complex microbial community. The structure of phyllosphere communities reflects immigration, survival and growth of microbial colonizers, which is influenced by numerous environmental factors in addition to leaf physical and chemical properties. Here, a combination of culture-base methods with PCR-DGGE was applied to test whether local or plant specific factors shape the bacterial community of the phyllosphere from three plant species (Avicenia shaueriana, Laguncularia racemosa and Rhizophora mangle), found in two mangroves. The number of bacteria in the phyllosphere of these plants varied between 3.62 x 10(4) in A. schaeriana and 6.26 x 10(3) in R. mangle. The results obtained by PCR-DGGE and isolation approaches were congruent and demonstrated that each plant species harbor specific bacterial communities in their leaves surfaces. Moreover, the ordination of environmental factors (mangrove and plant species), by redundancy analysis (RDA), also indicated that the selection exerted by plant species is higher than mangrove location on bacterial communities at phyllosphere.
authors.affiliation: Centro de Energia Nuclear na Agricultura, Universidade de São Paulo , Piracicaba, SP , Brasil ; Laboratório de Microbiologia Ambiental, Empresa Brasileira de Pesquisa Agropecuária , Jaguariúna , Brasil.
authors.forename: Armando Cavalcante Franco
authors.initials: AC
authors.lastname: Dias
authors.forename: Rodrigo Gouveia
authors.initials: RG
authors.lastname: Taketani
authors.forename: Fernando Dini
authors.initials: FD
authors.lastname: Andreote
authors.forename: Danice Mazzer
authors.initials: DM
authors.lastname: Luvizotto
authors.forename: João Luis
authors.initials: JL
authors.lastname: da Silva
authors.forename: Rosely Dos Santos
authors.initials: Rdos S
authors.lastname: Nascimento
authors.forename: Itamar Soares
authors.initials: IS
authors.lastname: de Melo
keywords: culture-independent profiling; plant genotype; surface leaves
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