Developmental trajectories and breakdown in F1 interpopulation hybrids of Tribolium castaneum.
Developmental trajectories and breakdown in F1 interpopulation hybrids of Tribolium castaneum.
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赤拟谷盗 F1 代群体间杂种的发育轨迹和分解。
DOI：
10.1002/ece3.536
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发表时间：
2013
影响因子：
2.6
通讯作者：
Wade,MichaelJ
中科院分区：
文献类型：
--
作者：
Drury,DouglasW;Ehmke,RossC;Jideonwo,VictoriaN;Wade,MichaelJ
当杂交不成活是局部适应的间接副产品时，我们预计其严重程度在成对种群之间会有所不同，并且对环境敏感。虽然完全的互交杂种无活力是局部适应的渐进过程的结果，但它并不代表不亲和性积累的过程。在面粉甲虫，赤拟谷盗，一些对人口表现出完全的，相互的F1杂交不亲和，而其他对是完全或部分兼容。我们的特点是这种自然发生的变化的程度和时间的杂交不相容表型的表达，以更好地了解基因或发育过程的数量有助于物种形成。我们评估了4个赤拟谷盗种群及其12个可能的F1代杂种从卵到成虫的每个生活史阶段的形态和发育变异。我们发现，所有种群间杂交都会影响杂交幼虫的发育速度，包括那些最终产生能存活、能生育的成虫的杂交。杂交不亲和性在发育早期表现为龄期持续时间的变化和龄期之间过渡的成功减少是相对于亲本种群的。具有相似发育特征的亲本群体可能产生发育中断的杂交种。杂种无活力的程度和表达时间取决于杂交的群体、杂交的方向和杂种生长的环境。我们的研究结果表明，参与过渡时期的发展基因的协调表达是在这个物种的杂交不亲和的根本原因。
When hybrid inviability is an indirect by‐product of local adaptation, we expect its degree of severity between pairs of populations to vary and to be sensitive to the environment. While complete reciprocal hybrid inviability is the outcome of the gradual process of local adaptation, it is not representative of the process of accumulation of incompatibility. In the flour beetle,Tribolium castaneum, some pairs of populations exhibit complete, reciprocal F1 hybrid incompatibility while other pairs are fully or partially compatible. We characterize this naturally occurring variation in the degree and timing of expression of the hybrid incompatible phenotype to better understand the number of genes or developmental processes contributing to speciation. We assessed the morphological and developmental variation in fourTribolium castaneumpopulations and their 12 possible F1 hybrids at each life‐history stage from egg to adult. We find that the rate of hybrid larval development is affected in all interpopulation crosses, including those eventually producing viable, fertile adults. Hybrid incompatibility manifests early in development as changes in the duration of instars and diminished success in the transition between instars are relative to the parent populations. Parent populations with similar developmental profiles may produce hybrids with disrupted development. The degree and timing of expression of hybrid inviability depends upon populations crossed, direction of the cross, and environment in which hybrids are raised. Our findings suggest that the coordinated expression of genes involved in transitional periods of development is the underlying cause of hybrid incompatibility in this species.