نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی کارشناسی ارشد فیزیولوژی و اصلاح گیاهان دارویی، پژوهشکده گیاهان و مواد اولیه دارویی، دانشگاه شهید بهشتی تهران، تهران، ایران
2 دانشیار، پژوهشکده گیاهان و مواد اولیه دارویی، دانشگاه شهید بهشتی تهران، تهران، ایران
3 مربی، پژوهشکده کشاورزی، پزشکی و صنعتی هستهای کرج، کرج، ایران
4 دانشیار، گروه اصلاح نباتات و بیوتکنولوژی، دانشکده کشاورزی، دانشگاه تربیت مدرس، تهران، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Arnica chamissonis Less. ssp. foliosa is a herbaceous perennial belonging to the Asteraceae family and endemic to north America and Canada. Inducing genetic mutation is a practical approach to increase genetic diversity for breeding purposes. Effect of different gamma radiation doses (0, 100, 200, 300, 400 and 500 gray) on seed germination and seedling growth of A chamissonis (e. g. plumule and rootlet length, germination percentage, speed and mean, seedling vigor, plumule fresh and dry weight, rootlet fresh and dry weight was measured and the proper dose for mutation induction was assessed. Gamma radiation caused significant effect on parameters such as plumule and rootlet length, germination percentage, germination rate, seedling vigor, rootlet fresh weight, plumule fresh and dry weight (P≤0.01) and also rootlet dry weight (P≤0.05). Radiation with 200 gray showed the most promising effects on germination parameters of this species. Compared to the control treatment, radiation with 300 gray and higher caused adverse effects on all mentioned parameters which may be caused by producing free radicals. An LD50 of 226.275 gray was estimated for this species and the best estimated dose to induce highest genetic mutation was 181.02 gray.
کلیدواژهها [English]