A NOVEL EPIPHYTIC CYANOBACTERIAL SPECIES FROM THE GENUS BRASILONEMA CAUSING DAMAGE TO EUCALYPTUS LEAVES

Autor(es)

Aguiar, Rosane ^[1] ; Fiore, Marli Fatima ^[2] ; Franco, Maione Wittig ^[1] ; Ventrella, Marilia Contin ^[1] ; Lorenzi, Adriana Sturion ^[2] ; Vanetti, Claudia A. ^[3] ; Alfenas, Acelino Couto ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Vicosa, Dept Plant Biol, Vicosa, MG - Brazil

^[2] Univ Sao Paulo, Ctr Nucl Energy Agr, Sao Paulo - Brazil

^[3] Univ Fed Vicosa, Microscopy & Microanal Ctr, Vicosa, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PHYCOLOGY; v. 44, n. 5, p. 1322-1334, OCT 2008.
• Citações Web of Science: 17

Resumo

A cyanobacterial mat colonizing the leaves of Eucalyptus grandis was determined to be responsible for serious damage affecting the growth and development of whole plants under the clonal hybrid nursery conditions. The dominant cyanobacterial species was isolated in BG-11 medium lacking a source of combined nitrogen and identified by cell morphology characters and molecular phylogenetic analysis (16S rRNA gene and cpcBA-IGS sequences). The isolated strain represents a novel species of the genus Brasilonema and is designated Brasilonema octagenarum strain UFV-E1. Thin sections of E. grandis leaves analyzed by light and electron microscopy showed that the B. octagenarum UFV-E1 filaments penetrate into the leaf mesophyll. The depth of infection and the mechanism by which the cyanobacterium invades leaf tissue were not determined. A major consequence of colonization by this cyanobacterium is a reduction in photosynthesis in the host since the cyanobacterial mats decrease the amount of light incident on leaf surfaces. Moreover, the cyanobacteria also interfere with stomatal gas exchange, decreasing CO2 assimilation. To our knowledge, this is the first report of an epiphytic cyanobacterial species causing damage to E. grandis leaves. (AU)

• Processo FAPESP: 05/56303-5 - Caracterizacao molecular de cianobacterias brasileiras e selecao de linhagens produtoras de peptideos nao ribossomicos.
• Beneficiário: Marli de Fátima Fiore
• Modalidade de apoio: Auxílio à Pesquisa - Regular