Evaluation of genetoxic effect of radiation over vegetal embryos in species with different radiosensibilities
Pages 112-117
Diana Vrîncianu, Cristina Ionită, Iulia Băra, Dorina Creangă
Abstract
This study presents the effects induced by X-rays, medium doses (20-70
Gy), over the meristematic tissues of three cereal species: one of barley
and two of wheat. The cytogenetic investigation was based on the
response of young seedlings during their very early ontogenetic stages to
the ionizing radiation exposure. The study was focused on the
identification and counting of the chromosomal aberrations for various
doses compared to the control samples. Qualitative evaluation revealed:
interchromatidian bridges, expulsed chromosomes or chromosome
fragments, and complex aberrations (combination of the already
mentioned ones). The different behavior of these three species was
discussed over the mitotic index, the number of abnormal ana-telophases
and over the percentages of the mitosis phases. In each case, the mitotic
index was increased in comparison with the control, and also the number
of aberrations was found increased; however no evident mathematical
correlations with applied doses could be established.