模拟微重力对玉米根尖细胞核的影响

Effects of Simulated Microgravity to Root Tip Nuclear of Zea mays L.

用水平旋转的方法模拟微重力环境来处理正萌发的玉米种子,探讨微重力条件对玉米根尖细胞核结构的影响.结果表明,在微重力的作用下,根尖分生区细胞出现较多的异形核及微核,同时还发现大量的异位核;在36h内,随着处理时间的增长,出现异形核、微核、异位核的频率增高,当处理时间进一步增长时,异形核、微核、异位核的出现频率有下降趋势.结论:模拟微重力对植物细胞核的形态、结构具有明显的诱变作用.

In order to study the effects of simulated microgravity conditions on the structure of the root nuclear of Zea mays L＇s, the method of rotating is used to simulate microgravity environment to deal with the sprouting seeds of Zea mtays L.. The results show that, under the effects of microgravity, the cells of apical meristem appear more profiled nuclear and micronucleus. And a large number of cells whose nuclear＇s locations have been migrated are found（hereinafter referred to ectopic nuclear）. 36 h, with the growth of the processing time, the frequency of profiled nuclear, micronucleus and ectopic nuclear turns higher. When processing time further grows, the frequency of profiled nuclear, micronucleeus, and ectopic nuclear appear a downward trend. Conclusion.. Simulated microgravity have obvious mutation role on the morphology and structure of planting nuclear.