The influence of temperature on meiosis
The influence of temperature on meiosis
复制标题
DOI：
10.1038/hdy.1957.4
复制
发表时间：
1957-01-01
期刊：
影响因子：
3.8
通讯作者：
DOWRICK, G. J.
中科院分区：
文献类型：
--
作者：
DOWRICK, G. J.
研究了温度对紫露草和悬雍垂减数分裂的影响。高温影响交叉的数目和位置以及染色体卷曲。温度升高导致间质交叉频率增加。在更高的温度下，间隙交叉和末端交叉的频率都下降。最终形成完全的不联会。在T.苞片。可以研究螺旋化;在高温下，主要的线圈打开并最终消失。染色体的特征通常不可见，例如，收缩，可以看到高温处理后。这些变化的进化意义进行了讨论。|| 摘要：G. J. Dowrick
The influence of temperature on the meiosis of Tradescantia bracteata and Uvularia perfoliata is considered. High temperatures affect the number and position of the chiasmata and chromosome coiling. Increase in temperature results in an increase in the frequency of interstitial chiasmata. At still higher temperatures the frequencies of both interstitial and terminal chiasmata fall. Eventually there is complete asynapsis. Prophase stages can be analyzed in heat-treated material of T. bracteata. Spiralization can be studied; and at high temperatures, major coils open out and finally disappear. Features of the chromosomes not normally visible, e.g., constrictions, can be seen after high temperature treatments. The evolutionary significance of these changes is discussed. || ABSTRACT AUTHORS: G. J. Dowrick