title: A comparative study of cambium histology of Ceiba speciosa (A. St.-Hil.) Ravenna (Malvaceae) under urban pollution.
abstract: Air pollution is considered to be one of the main causes of forest decline. The cambium is responsible for increase in tree girth, and its functioning is determined by environmental pressures. This study compared cambium histology of Ceiba speciosa (A. St.-Hil.) Ravenna (Malvaceae) in polluted and preserved sites in the Atlantic Rainforest domain. Samples were obtained during periods of cambial activity and dormancy and were processed and examined according to standard light microscopy techniques. In addition to differences typically observed in cambium during periods of activity and dormancy, the fusiform initials were shorter in trees of the polluted site. Furthermore, cambial rays were shorter, but larger, in the polluted site. It should be noted that all parameters related to cambial rays showed significant differences between the study sites. This is the first report of the effects of pollution on cambial activity in a South American species. The results suggest a tolerance of C. speciosa to pollution and reveal this species to be an important biomarker for environmental monitoring studies.
authors.affiliation: Programa de Pós-graduação em Biologia Vegetal, Instituto de Biologia Roberto Alcantara Gomes, Laboratório de Anatomia Vegetal, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524-PHLC, sala 224, 20550-013, Rio de Janeiro, RJ, Brazil.
authors.forename: Thaís Jorge
authors.initials: TJ
authors.lastname: de Vasconcellos
authors.affiliation: Programa de Pós-graduação em Biologia Vegetal, Instituto de Biologia Roberto Alcantara Gomes, Laboratório de Anatomia Vegetal, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524-PHLC, sala 224, 20550-013, Rio de Janeiro, RJ, Brazil.|Centro de Biociências e Biotecnologia, Laboratório de Biologia Celular e Tecidual, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Av. Alberto Lamego, 2000-Parque Califórnia, 28013-602, Campos dos Goytacazes, RJ, Brazil.
authors.forename: Maura
authors.initials: M
authors.lastname: Da Cunha
authors.affiliation: Programa de Pós-graduação em Biologia Vegetal, Instituto de Biologia Roberto Alcantara Gomes, Laboratório de Anatomia Vegetal, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524-PHLC, sala 224, 20550-013, Rio de Janeiro, RJ, Brazil. ccallado@uerj.br.|Instituto de Biologia Roberto Alcantara Gomes, Laboratório de Anatomia Vegetal, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524-PHLC, sala 224, 20550-013, Rio de Janeiro, RJ, Brazil. ccallado@uerj.br.
authors.forename: Cátia Henriques
authors.initials: CH
authors.lastname: Callado
mesh_terms: D001938:Brazil; D058506:Cambium / Q000033:anatomy & histology* / Q000187:drug effects; D035164:Ceiba / Q000033:anatomy & histology / Q000187:drug effects*; D002947:Cities; D004784:Environmental Monitoring; D004787:Environmental Pollution; D014197:Trees
keywords: Cambial activity; Environmental change; Phenotypic plasticity; Plant radial growth; Tropical forest; Urban vegetation; Wood production; Xylogenesis