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- Title
Effects of the pollution by petroleum on the tracheids along the stem of Podocarpus lambertii Klotzsch ex Endl., Podocarpaceae.
- Authors
Maranho, L. T.; Dziedzic, M.; Muñiz, G. I. B.; Kuniyoshi, Y. S.; Galvão, F.
- Abstract
Podocarpus lambertii Klotzseh ex Endl. (Podocarpaceae) is native and a member of the Pinophyta (Gymnosperm) of southern Brazil, locally known as "pinheiro-bravo". The present work aims to investigate the effects of petroleum on the tracheids dimensions. Wood samples from twenty individuals were studied along the stem, ten being exposed to pollution and ten used as a control set. The wood samples were collected from incisions at three levels: at the ground level, and one and two metres above the ground level. From these samples, sub-samples were selected at the border of the growth layers in the vascular cambium-medulla direction. The methodology followed that traditionally recommended for plant anatomy studies, with analyses done by light microscopy (OLYMPUS - BX41) assisted by the software Image Pro-plus for measurements. Comparison of the individuals exposed to petroleum with the control set, showed that the length, diameter and cell wall width of the tracheids of the former were smaller, a trend which was statistically significant according to the Student's t-test. These traits were observed mainly on the tracheids of the last growth layer, corresponding to the year in which the individuals were exposed to petroleum.
- Subjects
PODOCARPUS; OIL pollution of soils; TRACHEARY cells; PODOCARPACEAE; GYMNOSPERMS; MICROSCOPY
- Publication
Brazilian Journal of Biology, 2009, Vol 69, Issue 2, p263
- ISSN
1519-6984
- Publication type
Article
- DOI
10.1590/S1519-69842009000200005