Behavioral and spermatogenic hybrid male breakdown in Nasonia.
Behavioral and spermatogenic hybrid male breakdown in Nasonia.
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DOI：
10.1038/hdy.2009.152
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发表时间：
2010-03
期刊：
影响因子：
3.8
通讯作者：
Werren, J. H.
中科院分区：
文献类型：
--
作者：
Clark, M. E.;O'Hara, F. P.;Chawla, A.;Werren, J. H.
几个生殖障碍存在内Nasonia物种复杂，包括异地，交配前的行为隔离，受精后的活力和沃尔巴克氏体诱导的细胞质不相容性。在这里，我们表明，杂交男性遭受两个额外的生殖劣势，无法正确的法院女性和精子产量下降。杂交行为不育，其特征是杂交种进行必要的求偶行为的能力降低，发生在两种纳苏尼亚之间的杂交种中。杂种雄性产生于N。vitripennis和刺翅叶蝉N. giraulti追求雌性的频率降低（23-69%），与野生型N。vitripennis和刺翅叶蝉N.长颈鹿雄性（>93%）。求偶频率的降低并不是杂种不活跃的简单函数。细胞质（线粒体）背景的强烈影响也被发现在N。vitripennis和刺翅叶蝉N. giraulti杂交; F2杂种与giraulti细胞质显示能力下降，在大多数阶段的求爱。一对较年轻的种间产生的杂种，N。giraulti和N. longicornis，were behaviorally behaviorally肥沃.所有的雄性都有活动的精子，但在较老的物种对之间的杂交中，精子产量大大减少。vitripennis和刺翅叶蝉N.长颈鹿这种对杂种雄性的影响，降低精子数量而不是无功能精子，与大多数描述的杂种雄性不育病例不同，可能代表杂种精子破裂的早期阶段。结果添加到以前的研究F2杂种不育和行为不育，并表明，沃尔巴克氏体诱导的杂交不亲和性已经出现在物种分化的早期，相对于行为不育和生精不育。
Several reproductive barriers exists within the Nasonia species complex, including allopatry, premating behavioural isolation, postzygotic inviability and Wolbachia-induced cytoplasmic incompatibility. Here we show that hybrid males suffer two additional reproductive disadvantages, an inability to properly court females and decreased sperm production. Hybrid behavioural sterility, characterized by a reduced ability of hybrids to perform necessary courtship behaviours, occurs in hybrids between two species of Nasonia. Hybrid males produced in crosses between N. vitripennis and N. giraulti courted females at a reduced frequency (23-69%), compared to wild-type N. vitripennis and N. giraulti males (>93%). Reduced courtship frequency was not a simple function of inactivity among hybrids. A strong effect of cytoplasmic (mitochondrial) background was also found in N. vitripennis and N. giraulti crosses; F2 hybrids with giraulti cytoplasm showing reduced ability at most stages of courtship. Hybrids produced between a younger species pair, N. giraulti and N. longicornis, were behaviourally fertile. All males possessed motile sperm, but sperm production is greatly reduced in hybrids between the older species pair, N. vitripennis and N. giraulti. This effect on hybrid males, lowered sperm counts rather than non-functional sperm, is different from most described cases of hybrid male sterility and may represent an earlier stage of hybrid sperm breakdown. The results add to previous studies of F2 hybrid inviability and behavioural sterility, and indicated that Wolbachia induced hybrid incompatibility has arisen early in species divergence, relative to behavioural sterility and spermatogenic infertility.
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