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Volume 36 Number 3 Volume 36 Number 4 Volume 37 Number 1

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Research articles

ScienceAsia 36 (2010): 292-296 |doi: 10.2306/scienceasia1513-1874.2010.36.292

Cytogenetic abnormalities caused by extremely low frequency electromagnetic fields in canola

Azita Shabrangia, Masoud Sheidaib,*, Ahmad Majda, Mohammad NabIunia, Davoud Dorranianc

ABSTRACT:     A meiotic study was performed on Brassica napus exposed to electromagnetic fields. Our investigation used plants grown from dry pretreated seeds with 10 mT for 4 h, wet pretreated seeds with 10 mT for 2 h, and a control line. A lower seed yield was produced in the plants grown from exposed grains. However, the weight of 1000 seeds were higher in the plants grown from exposed grains. The highest value of the weight of 1000 seeds occurred in the plants grown from pretreated dry seeds with 10 mT for 4 h. The size of yielding seeds of plants grown from dry pretreated seeds with 10 mT for 4 h were higher than that of the control seeds and they were of uniform size. A significant difference was observed for meiotic characters studied among genotypes. The mean value of total, terminal, and intercalary chiasmata seems to be reduced significantly in plants grown from exposed seeds, indicating that EM significantly reduces the mean value of the genetic recombination. Other meiotic characteristics including ring bivalent and quadrivalent formation were also reduced significantly in the plants grown from treated seeds. Cytological abnormalities observed are chromosome stickiness, laggards, and micronuclei formation which differed significantly among the genotypes indicating their genetic differences. Cytomixis occurred in treated plants, which led to the formation of aneuploid cells.

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a Department of Biological Science, Faculty of Science, Tarbiat Moallem University, Tehran, Iran
b Faculty of Biological Science, Shahid Beheshti University, GC, Tehran, Iran
c Plasma Physics Research Centre, Science and Research Branch, Islamic Azad University, Tehran, Iran

* Corresponding author, E-mail: msheidai@yahoo.com

Received 27 Jun 2010, Accepted 17 Nov 2010