Infection of macronuclear anlagen of Paramecium caudatum with the macronucleus-specific symbiont Holospora obtusa.
Infection of macronuclear anlagen of Paramecium caudatum with the macronucleus-specific symbiont Holospora obtusa.
复制标题
大核特异性共生体 Holospora obtusa 感染尾草履虫大核原基。
作者：
M. Fujishima;H. Görtz
钝顶青霉是草履虫的一种核内共生菌，它通过食物液泡进入宿主细胞，只感染宿主细胞的大核，但不侵染微核。由于这两种核来自受精核，因此假设大核获得了在核分化过程中的特定时间被细菌识别所必需的属性。我们发现，这一特性是由8个合子后核中的4个在形态上分化为大核原后获得的。
The gram-negative bacterium Holospora obtusa is an endonuclear symbiont of Paramecium caudatum, which is incorporated into the host cells via the food vacuoles and infects their macronucleus exclusively, but never the micronucleus. Since these two kinds of nuclei originate from a fertilization nucleus, it is assumed that the macronucleus acquires a property necessary for it to be recognized by the bacterium at a certain time during the nuclear differentiation process. We found that this property is acquired by four of the eight postzygotic nuclei as soon as the four nuclei differentiate morphologically into the macronuclear anlagen.