2009
DOI: 10.1590/s0102-33062009000400012
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Efeitos fitotóxicos do fluoreto na morfoanatomia foliar de Brachiaria brizantha (Hochst. ex A. Rich.) Stapf e Brachiaria decumbens Stapf (Poaceae)

Abstract: -(Phytotoxic effects of fl uoride in leaf morpho-anatomy of Brachiaria brizantha (Hochst. Ex A. Rich.) Stapf and Brachiaria decumbens Stapf (Poaceae)). To assess the effects of fl uoride on signal grass, plants of Brachiaria brizantha and B. decumbens were submitted to simulated fl uoride fog (10 μg ml -1 ). Leaf fragments from apparently healthy portions were colleted 24 hours after the last exposure and used for microscopic analysis. Roots, leaves and rhizomes were submitted to fl uoride content quantifi cat… Show more

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Cited by 16 publications
(8 citation statements)
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References 27 publications
(33 reference statements)
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“…The frequently observed morphological change was the decrease in intercellular spaces, with greater density of parenchymal cells, providing tissue compression ( Figures 2D, F). A similar result was found in fluoride toxicity studies in vegetables (Sant'Anna-Santos and Azevedo, 2010), highlighting the importance of microscopy as an important element to compare the sensitivity of species in response to pollution (Pita-Barbosa et al, 2009). Its reduction decreases the light absorption by the leaf due to impairment of gas diffusion in the leaf mesophyll (Vogelman et al, 1996), since in dorsiventral leaves SP, with its irregular architecture and wide intercellular space, increases the distance that light reaches in the leaf through reflection in the gas/liquid interfaces (Lambers et al, 1998).…”
Section: Figure 2 -Cross Section Of Leaves Of Forest Species: Cedrelasupporting
confidence: 81%
“…The frequently observed morphological change was the decrease in intercellular spaces, with greater density of parenchymal cells, providing tissue compression ( Figures 2D, F). A similar result was found in fluoride toxicity studies in vegetables (Sant'Anna-Santos and Azevedo, 2010), highlighting the importance of microscopy as an important element to compare the sensitivity of species in response to pollution (Pita-Barbosa et al, 2009). Its reduction decreases the light absorption by the leaf due to impairment of gas diffusion in the leaf mesophyll (Vogelman et al, 1996), since in dorsiventral leaves SP, with its irregular architecture and wide intercellular space, increases the distance that light reaches in the leaf through reflection in the gas/liquid interfaces (Lambers et al, 1998).…”
Section: Figure 2 -Cross Section Of Leaves Of Forest Species: Cedrelasupporting
confidence: 81%
“…Os sintomas observados em S. dulcis são idênticos aos registrados em experimentos conduzidos em laboratório (Silva et al 2000) e em campo (Sant'Anna-Santos 2008) e típicas em resposta ao fl úor (Ardnt et al 1995), indicando a presença do poluente em níveis fi totóxicos na atmosfera. Apesar dos sintomas observados em P. crispum não serem semelhantes aos registros fotográfi cos disponíveis na literatura da fi totoxidez por fl úor (Ardnt et al 1995;Fornasiero 2001;Fortes et al 2003;Weinstein & Davison 2003;2004;Mezghani et al 2005;Pita-Barbosa et al 2009;Sant'AnnaSantos et al 2007), pode haver variação na sintomatologia entre espécies vegetais distintas, conforme observado por Weinstein & Davison (2004) e pode haver, além da presença do fl úor, outros poluentes cuja interação pode resultar em sintomatologia diversa da típica para fl úor.…”
Section: Resultsunclassified
“…7H, J). Os danos descritos na morfologia foliar das hortaliças ao MEV são semelhantes aos relatados na literatura em plantas expostas ao fl úor (Chaves et al 2002;Sant'Anna-Santos 2008;Pita-Barbosa et al 2009). …”
Section: (Faces Adaxial (A-e) E Abaxial (F-j))unclassified
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