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Developmental Abnormality in Agricultural Region and Toxicity of the Fungicide Benomyl on Korea salamander, Hynobius leechii  

Choi, Yeoung-Ju (Dept. of Biological Education, Graduate School of Education, Changwon National university)
Yoon, Chun-Sik (Institute of Genetic engineering, Changwon National university)
Park, Joo-Hung (Dept. of Biology, College of Natural Sciences, Changwon National university)
Jin, Jung-Hyo (Dept. of Biology, College of Natural Sciences, Changwon National university)
Cheong, Seon-Woo (Dept. of Biology, College of Natural Sciences, Changwon National university)
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Abstract
A numerical variation and abnormalities were studied on egg bags and embryos of Korean salamander, Hynobius leechii from agricultural habitat. The teratogenic and toxic effects of fungicide benomyl were also investigated with early embryos from non-agricultural habitat. We collected 144 egg bags from agricultural region, and 3418 of early embryos were contained. The lengths of egg bags were varied from 10 to 23 cm and the most frequent length was 19 cm. The number of embryos was varied from 7 to 43, and the most frequent range was 22 to 26. Spontaneous abnormalities were occurred in 406 embryos among 116 egg bags, and 24 kinds of external abnormalities were found. Individuals showing severe external defect were histologically studied and they showed optic dyspalsia, thyroid carcinoma, somatic muscular dysplasia, partial biaxial structure, decrease of red blood cells in the heart, cephalic degeneration and intestinal dysplasia. 385 embryos from non-agricultural region were exposed to 200 nM${\sim}$ 1 ${\mu}$M of benomyl at blastula or gastrula for 12 days. All embryo were dead in the concentration of 1 ${\mu}$M (LD$_{100}$) and 75% of embryos were dead in 800nM of benomyl. Speciflc effect due to benomyl was acrania or cephalic dysplasia and this restult suggests that the benomyl inhibit stongly to the development of neural tissue. These abnormal developments may be caused by antimitotic action, inhibition of tubulin complex, destruction of microtubule, inhibitions of neurulation and closing of neural fold, and by the inhibition of the movement of neural crest cells.
Keywords
Korean salamander; Hynobius leechii; abnormal development; toxicity; fungicide benomyl;
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