Diversity in mating behavior of hermaphroditic and male-female caenorhabditis nematodes
Diversity in mating behavior of hermaphroditic and male-female caenorhabditis nematodes
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DOI：
10.1534/genetics.106.068304
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发表时间：
2007-04-01
期刊：
影响因子：
3.3
通讯作者：
Koo, Pamela
中科院分区：
文献类型：
--
作者：
Garcia, L. Rene;LeBoeuf, Brigitte;Koo, Pamela
在这项研究中，我们解决了为什么秀丽隐杆线虫男性是低效的，在他们的雌雄同体。在交配过程中，雌雄同体通常会在受孕前离开雄性。C.秀丽线虫雌雄同体通过体内自花受精进行繁殖，因此物种繁殖不需要与雄性交配。雌雄同体的繁殖模式可能会放松对优化雄性交配行为的基因的选择。我们研究了雌雄同体和雌雄异株（雌雄交配）的小杆线虫物种的雄性，以确定它们是否使用不同的感觉和运动机制来控制它们的交配行为。相反，我们通过激光消融分析和行为观察发现，雌雄同体的C。briggsae和雌雄异株C. remanei和小杆线虫物种4，PB 2801雄性产生在交配期间固定雌性的因子。这一因素也刺激外阴缝变宽，使男性交配骨针可以很容易地插入。C. elegans和C.布里格萨雌雄同体不受此因素的影响。我们认为，感官和运动执行交配行为没有显着改变的男性之间的不同Caesophylhabditis物种，然而，在内部自受精的进化过程中，雌雄同体已经失去了能力，以应对男性soppericic诱导因素。
In this study, we addressed why Caenorhabditis elegans males are inefficient at fertilizing their hermaphrodites. During copulation, hermaphrodites generally move away from males before they become impregnated. C. elegans hermaphrodites reproduce by internal self-fertilization, so that copulation with males is not required for species propagation. The hermaphroditic mode of reproduction could potentially relax selection for genes that optimize male mating behavior. We examined males from hermaphroditic and gonochoristic (male-female copulation) Caenorhabditis species to determine if they use different sensory and motor mechanisms to control their mating behavior. Instead, we found through laser ablation analysis and behavioral observations that hermaphroditic C. briggsae and gonochoristic C. remanei and Caenorhabditis species 4, PB2801 males produce a factor that immobilizes females during copulation. This factor also stimulates the vulval slit to widen, so that the male copulatory spicules can easily insert. C. elegans and C. briggsae hermaphrodites are not affected by this factor. We suggest that sensory and motor execution of mating behavior have not significantly changed among males of different Caenorhabditis species; however, during the evolution of internal self-fertilization, hermaphrodites have lost the ability to respond to the male soporific-inducing factor.