Vishalakshi Chavali, Singh Bashisth N
Genetics Laboratory, Department of Zoology, Banaras Hindu University, Varanasi 221 005, India.
J Hered. 2009 Mar-Apr;100(2):181-91. doi: 10.1093/jhered/esn094. Epub 2008 Oct 30.
Due to inconsistent results of the empirical studies, the relationship between fluctuating asymmetry (FA, a measure of developmental stability) and interspecific hybridization has been the subject of intense debates. In the present study, we have assessed the impact of interspecific hybridization between 2 sibling species of Drosophila: Drosophila ananassae and Drosophila pallidosa on the levels of FA over 3 generations. Trait size of different morphological traits, namely, sternopleural bristle number, wing length (WL), wing to thorax (W/T) ratio, sex comb tooth number (SCTN), and ovariole number differed significantly among parental species and their hybrids of different generations in both the sexes. However, the levels of FA of different morphological traits were similar in parental species and their hybrids of different generations in males (except SCTN) and in females (except for WL and W/T ratio). These results are interpreted in terms of developmental stability as a function of a balance between the level of heterozygosity and the disruption of coadapted gene complexes.
由于实证研究结果不一致，波动不对称性（FA，一种发育稳定性的度量）与种间杂交之间的关系一直是激烈争论的主题。在本研究中，我们评估了果蝇的两个近缘物种——拟果蝇和苍白果蝇之间的种间杂交对三代果蝇FA水平的影响。不同形态特征的性状大小，即腹侧板刚毛数、翅长（WL）、翅胸比（W/T）、性梳齿数（SCTN）和卵巢管数，在亲本物种及其不同代杂种的两性中均存在显著差异。然而，不同形态特征的FA水平在亲本物种及其不同代杂种的雄性（SCTN除外）和雌性（WL和W/T比除外）中相似。这些结果根据发育稳定性进行了解释，发育稳定性是杂合度水平与共适应基因复合体破坏之间平衡的函数。
