REPRODUCTIVE ISOLATION IN RHABDITIDAE (NEMATODA, SECERNENTEA) - MECHANISMS THAT ISOLATE 6 SPECIES OF 3 GENERA
REPRODUCTIVE ISOLATION IN RHABDITIDAE (NEMATODA, SECERNENTEA) - MECHANISMS THAT ISOLATE 6 SPECIES OF 3 GENERA
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DOI：
10.2307/2409629
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发表时间：
1992-06-01
期刊：
影响因子：
3.3
通讯作者：
EMMONS, SW
中科院分区：
文献类型：
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作者：
BAIRD, SE;SUTHERLIN, ME;EMMONS, SW
我们尝试了六种杆状线虫的种间杂交：秀丽隐杆线虫、Briggsae隐杆线虫、Remanei隐杆线虫、小杆线虫、小杆线虫，和圆斑天牛。在所有小杆线虫物种之间的杂交中观察到交配，但是，没有一个导致稳定的杂交种群的产生。在Caenorhabditis雄性与Rhabditis或Pelodera雌性之间的杂交中，即使存在同类雌性，也没有观察到交配，这表明Caenorhabditis雄性能够通过短程刺激选择性地识别同类雌性。所有成对组合的小杆线虫物种被隔离在一定程度上的配子机制，12个组合中的7个是交叉不育和5个12个是交叉生育，但具有低育雏大小。在交叉可育组合中，大多数杂交胚胎在原肠胚形成之前是无活力和停滞的。只有在C的十字架上。briggsae雄性至C. sp. v雌性的任何杂种都能在胚胎发生中存活。大多数C。布里格塞角sp. v的杂交种在幼虫发育期间停滞，并且少数达到成年期的总是雌性。这些结果与C.布里格塞角sp. v combination：C. briggsae和C.特别地，特殊地
We have attempted interspecific hybridizations among six species of rhabditid nematodes: Caenorhabditis elegans, Caenorhabditis briggsae, Caenorhabditis remanei, Caenorhabditis sp. v, Rhabditis sp., and Pelodera teres. Copulation was observed in all crosses between Caenorhabditis species; however, none resulted in the generation of stable hybrid populations. No copulation was observed in crosses between Caenorhabditis males and Rhabditis or Pelodera females, even when congeneric females were present, suggesting that Caenorhabditis males are able to selectively recognize congeneric females by a short-range stimulus. All pairwise combinations of Caenorhabditis species were isolated to some degree by gametic mechanisms; 7 of 12 combinations were cross infertile and 5 of 12 were cross-fertile but had low brood sizes. In cross-fertile combinations, most hybrid embryos were inviable and arrested prior to gastrulation. Only in crosses of C. briggsae males to C. sp. v females did any hybrids survive embryogenesis. Most of these C. briggsae/C. sp. v hybrids arrested during larval development, and the few that reached adulthood invariably were female. These results are consistent with the presence of at least two lethal factors in the C. briggsae-C. sp. v combination: a maternal lethal factor in the cytoplasm of C. briggsae and a recessive lethal factor on the X chromosome of C. sp. v.