Chlorophyll a fluorescence and ultrastructural changes in chloroplast of water hyacinth as indicators of environmental stress

Autor(es)

Lage-Pinto, Frederico ^[1] ; Oliveira, Jurandi G. ^[2] ; Da Cunha, Maura ^[3] ; Souza, Cristina M. M. ^[1] ; Rezende, Carlos E. ^[1] ; Azevedo, Ricardo A. ^[4] ; Vitoria, Angela P. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Norte Fluminense, Ctr Biociencia & Biotecnol, Lab Ciencias Ambientais, Campos Dos Goytacazes - Brazil

^[2] Univ Estadual Norte Fluminense, Ctr Ciencias & Tecnol Agropecuarias, Lab Melhoramento Genet Vegetal, Campos Dos Goytacazes - Brazil

^[3] Univ Estadual Norte Fluminense, Ctr Biociencia & Biotecnol, Lab Biol Celular & Tecidual, Campos Dos Goytacazes - Brazil

^[4] Univ Sao Paulo, Escola Super Agr Luiz Queiroz, Dept Genet, BR-05508 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ENVIRONMENTAL AND EXPERIMENTAL BOTANY; v. 64, n. 3, p. 307-313, DEC 2008.
• Citações Web of Science: 26

Resumo

Chlorophyll a fluorescence parameters and transmission electron microscopy (TEM) were used to assess the stress conditions in water hyacinth along the Paraiba do Sul River (PSR), an important River in southeastern Brazil. The data were obtained at the end of the dry season of 2005 and at the end of the wet season of 2006. Changes in F-o and F-m parameters were observed as differentiated responses, depending on the season. Non-photochemical dissipation (qN and NPQ) from plants was greater in the most industrialized region of the PSR in both seasons. However, F-v/F-m for all samples ranged between 0.77 and 0.81, showing that high maximum quantum yield was maintained. Although the F-v/F-m suggests that the plants were exhibiting normal photochemical activities, ultrastructural changes in chloroplasts showed thylakoids disorganization. Plants from the most industrialized region showed non-stacking grana thylakoids disposition. In spite of these alterations, the membrane integrity was maintained, suggesting an adaptation to adjustment to adverse environmental conditions. (C) 2008 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 04/15012-5 - Vegetacao e metais pesados: estudo no rio paraiba do sul.
• Beneficiário: Ricardo Antunes de Azevedo
• Modalidade de apoio: Auxílio à Pesquisa - Regular