Loss of social behaviors by Myxococcus xanthus during evolution in an unstructured habitat
Loss of social behaviors by Myxococcus xanthus during evolution in an unstructured habitat
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DOI：
10.1073/pnas.95.21.12376
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发表时间：
1998-10-13
影响因子：
11.1
通讯作者：
Lenski, RE
中科院分区：
文献类型：
--
作者：
Velicer, GJ;Kroos, L;Lenski, RE
社会行为通常是高等生物自然选择的目标，但量化这种选择的影响是困难的。我们已经使用细菌粘球菌xanthus作为研究社会相互作用进化的模型系统。12M的社会行为变化。在液体栖息地中进化1，000代后，对苍耳种群进行了量化，其中个体之间的相互作用不断受到摇动和低细胞密度的阻碍。衍生谱系进行了比较，他们的祖先方面的最大增长率，运动率在硬和软琼脂，子实体形成能力，和孢子形成频率在饥饿。在进化品系中，液体选择性的改善通常与M的所有主要社会行为的显着减少有关。xanthus在非社会性成长条件下，维持功能性社会行为显然不利于健康。
Social behaviors are often targets of natural selection among higher organisms, but quantifying the effects of such selection is difficult. We have used the bacterium Myxococcus xanthus as a model system for studying the evolution of social interactions. Changes in the social behaviors of 12 M. xanthus populations were quantified after 1,000 generations of evolution in a liquid habitat, in which interactions among individuals were continually hindered by shaking and low cell densities. Derived lineages were compared with their ancestors with respect to maximum growth rate, motility rates on hard and soft agar, fruiting body formation ability, and sporulation frequency during starvation. Improved performance in the liquid selective regime among evolved lines was usually associated with significant reductions in all of the major social behaviors of M. xanthus. Maintenance of functional social behaviors is apparently detrimental to fitness under asocial growth conditions.