Cortés F, Domínguez I, Mateos S, Piñero J, Mateos J C
Departamento de Biología Celular, Facultad de Biología, Sevilla, Spain.
Int J Radiat Biol. 1990 Mar;57(3):537-41. doi: 10.1080/09553009014552671.
Allium cepa root-tip cells were first exposed to low 'conditioning' doses of ionizing radiation: to X-rays (0.06 or 0.26 Gy) or to incorporated tritium (1.8 x 10(4) or 7.2 x 10(4) Bq/ml; specific activity: 740.0 GBq/mmol) and subsequently given a 'challenge' dose of 1.5 Gy of X-rays. A reduction in X-ray-induced chromosomal damage was brought about by prior exposure to 0.26 Gy of X-rays, while cells receiving the lower conditioning dose (0.06 Gy of X-rays) did not show any significant reduction. In cells grown in the presence of [3H]TdR on the other hand, the adaptive response was evident after both doses given. The results are essentially in agreement with those published by Wolff's group for human lymphocytes in showing that plant cells in vivo can become 'adapted' by exposure to low-level irradiation so that they become more resistant to the clastogenic effects of X-rays delivered subsequently.
洋葱根尖细胞首先暴露于低剂量的“预处理”电离辐射下：接受X射线（0.06或0.26戈瑞）或掺入的氚（1.8×10⁴或7.2×10⁴贝可勒尔/毫升；比活度：740.0吉贝可勒尔/毫摩尔）处理，随后给予1.5戈瑞的X射线“激发”剂量。预先暴露于0.26戈瑞的X射线可导致X射线诱导的染色体损伤减少，而接受较低预处理剂量（0.06戈瑞X射线）的细胞未显示出任何显著减少。另一方面，在[³H]胸腺嘧啶核苷存在下生长的细胞，在给予两种剂量后均出现适应性反应。这些结果与沃尔夫团队发表的关于人类淋巴细胞的结果基本一致，表明体内植物细胞可通过暴露于低水平辐射而“适应”，从而使其对随后给予的X射线的致断裂效应更具抗性。
