Xylem structure in pine trees grown near the Chernobyl Nuclear Power Plant/Ukraine

Citation
U. Schmitt et al., Xylem structure in pine trees grown near the Chernobyl Nuclear Power Plant/Ukraine, IAWA J, 21(4), 2000, pp. 379-387
Citations number
11
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Plant Sciences
Journal title
IAWA JOURNAL
ISSN journal
0928-1541 → ACNP
Volume
21
Issue
4
Year of publication
2000
Pages
379 - 387
Database
ISI
SICI code
0928-1541(2000)21:4<379:XSIPTG>2.0.ZU;2-S
Abstract
Pine trees around the Chernobyl Nuclear Power Plant, Ukraine, were investig ated by light- and electron-microscopy as well as UV-microspectrophotometry in order to find out whether the accident on April 26 in 1986 affected the structure of xylem formed. The analysis of increment cores did not reveal any influence on the amount of xylem formed in 1986, but there was a distin ct reduction during the subsequent three years. The xylem formation had rec overed in 1990. 'Forking' in the rows of tracheids was frequently seen at t he cellular level in the 1986 tree ring. This phenomenon also occurred in t he 1987 tree ring, but was less pronounced. It appears that the radioactive irradiation had no direct effect on the cambium in 1986, but affected the differentiation of xylem mother cells. The reduced wood formation between 1 987 and 1989 appeared to be a consequence of the massive losses in needles in the year of the accident rather than of the uptake of radiobiologically active elements. The layering and lignification of the tracheid walls were not affected.