6 research outputs found

    Stress-induced cytological and chemical adaptations in Cupressus plants from an urban area of Palermo (Italy)

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    We studied stress-induced cytological and chemical adaptations in Cupressus pollens and needles from the area of Palermo (Sicily, Italy), in polluted and control sites (unpolluted) of urban and suburban areas. Pollen and needle chemical composition were investigated to provide an indicator of contamination of the trees, which were also examined structurally throughout one year. The concentration of particulate with lead was found to be significantly higher in plants at the polluted traffic site. Lead is one of the worst particulate pollutants in cities, especially in the winter season. In trees from the polluted site, all structural analysis revealed displasies. Structural changes, observed in trees from polluted sites, are most likely caused by the toxic effects of various pollutants, for example particulate, because fine particulate, with metals, is on the rise at present. We studied the effects on the pollen with an optical microscope, a scanning electron microscope (SEM) and cytochemical staining of esterases and acid phosphatase.Nous avons \ue9tudi\ue9 les effets cytologiques et chimiques dus au stress dans les pollens et les aiguilles du Cypr\ue8s commun \ue0 Palerme (Sicilie, Italie), dans des stations pollu\ue9es et t\ue9moin des zones urbaines et suburbaines. Nous avons examin\ue9 la composition chimique du pollen et des aiguilles pour d\ue9terminer un indicateur de stress des arbres, qui ont \ue9t\ue9 aussi examin\ue9s pendant une ann\ue9e. La concentration de plomb s'est r\ue9v\ue9l\ue9e beaucoup plus haute dans la station pollu\ue9e. L'analyse structurelle des arbres dans la station pollu\ue9e a r\ue9v\ue9l\ue9 des dysplasies. Les changements structurels qui y ont \ue9t\ue9 observ\ue9s sont caus\ue9s, selon toute probabilit\ue9, par les effets toxiques de diff\ue9rentes substances polluantes, par exemple la poudre fine de plomb. Nous avons examin\ue9 les effets dans les pollens avec un microscope optique, un microscope \ue9lectronique \ue0 balayage et la coloration cytochimique des est\ue9rases et des phosphatases acides
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