THE ECOLOGY AND GENETICS OF FITNESS IN CHLAMYDOMONAS. XII. REPEATED SEXUAL EPISODES INCREASE RATES OF ADAPTATION TO NOVEL ENVIRONMENTS
THE ECOLOGY AND GENETICS OF FITNESS IN CHLAMYDOMONAS. XII. REPEATED SEXUAL EPISODES INCREASE RATES OF ADAPTATION TO NOVEL ENVIRONMENTS
复制标题
衣藻健康的生态学和遗传学。
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
G. Bell
中科院分区：
文献类型：
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作者：
O. Kaltz;G. Bell
摘要我们研究了单细胞绿藻莱茵衣藻在黑暗中对新型碳基质所提供的新的不利生长条件的适应动力学。该实验旨在将常年无性繁殖的品系与经历过一次或多次性行为的品系进行对比。所有品系都能适应新的环境。然而，性线在实验过程中表现出更大的适应性，特别是在更复杂的环境中。此外，性别对适应的影响随着连续性事件的次数而增加。适应的时间过程表明，性最初引起的健身标准化方差的增加和平均健身的初始下降，至少在第二次或第三次性行为后。这些短期效应之后是一段恢复期，在此期间，有性系的适应性最终超过了无性系。平均健身的增加反映了减少健身相对于无性系的标准化方差，这表明定向选择用完了减数分裂重组产生的变化，从而赋予健身优势的有性系。这些结果支持了Weismann-Fisher-Muller假说在自然种群中的性别维持。
Abstract We investigated the dynamics of adaptation of the unicellular chlorophyte Chlamydomonas reinhardtii to new and hostile conditions of growth provided by novel carbon substrates in the dark. The experiment was designed to contrast perennially asexual lines with lines that had experienced one or more sexual episodes. All lines were capable of adapting to the novel environment. The sexual lines, however, showed greater adaptation over the course of the experiment, especially in more complex environments. Moreover, the effect of sex on adaptation increased with the number of successive sexual episodes. The time-course of adaptation showed that sex initially caused an increase in the standardized variance of fitness and an initial drop in mean fitness, at least after a second or third sexual episode. These short-term effects were followed by a period of recovery during which the fitness of sexual lines eventually exceeded that of asexual lines. The increase in mean fitness was mirrored by a decrease in the standardized variance of fitness relative to asexuals, suggesting that directional selection used up the variation generated by meiotic recombination and thereby conferred a fitness advantage to the sexual lines. These results support the Weismann-Fisher-Muller hypothesis for the maintenance of sex in natural populations.
影响因子：
1.5
作者：
PAMILO, P;NEI, M;LI, WH
通讯作者：
LI, WH
影响因子：
3.1
作者：
KONDRASHOV, AS
通讯作者：
KONDRASHOV, AS