Cytological effects of aerospace flight and ~(60)co-γ-rays irradiation on the seeds of lactuca indica L

• Published in: Acta Agrestia Sinica Vol. 15; no. 5
• Main Author: Liu Li, Tang Fenglan, Zhang Yuexue
• Format: Journal Article
• Language: Chinese
• Published: 01.09.2007
• Subjects: http://www.fao.org/aos/agrovoc#c_3951; http://www.fao.org/aos/agrovoc#c_4148; http://www.fao.org/aos/agrovoc#c_6927; IRRADIACION; IRRADIATION; LACTUCA INDICA; SEED; SEMENCE; SEMILLAS

利用返回式卫星搭载苦荬菜(Lactucaindica)干种子,研究比较其与用不同剂量γ射线辐照对苦荬菜根尖细胞的遗传学效应。实验结果表明:与地面对照组相比,种子空间飞行可促进根尖细胞有丝分裂;而γ射线则抑制根尖细胞有丝分裂,并随着辐照剂量的增加有丝分裂指数逐步下降。二者均可诱发根尖细胞产生微核、染色体断裂、染色体粘连、落后染色体、游离染色体、桥等畸变。但空间飞行诱发畸变的频率明显低于γ射线辐照。在γ射线辐照剂量0～30Gy范围内,随着剂量的增加,单微核、多微核和染色体总畸变频率逐步升高。...