Key Laboratory of Protein Chemistry and Fish Developmental Biology of Education Ministry of China, College of Life Sciences, Hunan Normal University, Changsha 410081, China.
BMC Genet. 2014 Mar 15;15:33. doi: 10.1186/1471-2156-15-33.
Distant hybridization can generate transgressive hybrid phenotypes that lead to the formation of new populations or species with increased genetic variation. In this study, we produced an experimental hybrid goldfish (EG) by distant crossing of red crucian carp (Carassius auratus) × common carp (Cyprinus carpio) followed by gynogenesis.
We evaluated the phenotype, ploidy level, gonadal structure, and 5S rDNA of the EG. Diploid EG possessed a high level of genetic variation, which was stably inherited. In particular, the EG combined transgressive phenotypes, including a forked tail and shortened caudal peduncle, traits that are present in common goldfish. The EG and common goldfish share a number of morphological and genetic similarities.
Using the EG, we provide new evidence that goldfish originated from hybridization of red crucian carp × common carp.
远缘杂交可以产生超越杂种表型，导致具有增加遗传变异的新种群或物种的形成。在这项研究中，我们通过红鲫（Carassius auratus）×鲤鱼（Cyprinus carpio）的远缘杂交，然后进行雌核发育，产生了实验性杂交金鱼（EG）。
我们评估了 EG 的表型、倍性水平、性腺结构和 5S rDNA。二倍体 EG 具有高水平的遗传变异，并且稳定遗传。特别是，EG 具有叉尾和缩短尾柄等杂种表型，这些特征存在于普通金鱼中。EG 和普通金鱼具有许多形态和遗传上的相似之处。
使用 EG，我们提供了新的证据表明金鱼起源于红鲫×鲤鱼的杂交。
