乌苏里拟鲿与黄颡鱼杂交效果的研究

Study on the Heterosis between Pseudobagrus ussuriensis and Pelteobagrus fulvidraco

本文以乌苏里拟鲿(Pseudobagrusussuriensis)与黄颡鱼(Pelteobagrusfulvidraco)为亲本,采用完全双列杂交方法建立了乌苏里拟鲿、黄颡鱼种内互交组合、乌苏里拟鲿♂×黄颡鱼♀、黄颡鱼♂×乌苏里拟鲿♀四个试验组合,以考察是否存在杂种优势。基于加–显性遗传分析模型分别计算了60d、400d、700d时存活率、体重、特定生长率以及肥满度的正交及反交杂种优势率。结果表明,两个种间的杂交不同性状在不同时间存在程度不同的杂种优势率,其中乌♂×黄♀存活率的平均优势率、超亲优势率均为最高,分别为17.03(±2.21)%和10.85(±2.11)%;在体重方面,黄♂×乌♀组合的平均优势率最高为24.11(±2.01)%,乌♂×黄♀体重的超亲优势率最高为18.36(±2.15)%;肥满度的平均优势率与超亲优势率变化不显著;平均优势率与超亲优势率都随时间逐渐降低。本研究结果可为养殖生长提供参考。

To examine the presence of heterosis between Pseudobagrus ussuriensis and Pelteobagrus fulvidraco, four mating combinations were established using complete diallel cross: P. Ussuriensis ×P. ussuriensis, P. fulvidraco ×P. fulvidraco, P. ussuriensis ♂ ×P. fulvidraco ♀ and P. fulvidraco ♂ ×P. ussuriensis ♀. The heterosis of forward and backward crosses for survival, body weight, specific growth rate and condition factor at 60 d, 400 d and 700 d was analyzed based upon the additive- dominance genetic model. Results showed that there existed heterosis to a varying degree for the traits examined at different temporal points. The average heterosis and over-better-parent heterosis of survival for the combination P. ussuriensis ♂ ×P. fulvidraco ♀ were highest, 17.03 (?2.21)% and 10.85 (?2.11)%, respectively;the heterosis of body weight for the combination P. fulvidraco♂ ×P. ussuriensis ♀ was highest, 24.11 (?2.01)% and the over-better-parent heterosis of body weight for the combination P. ussuriensis ♂ ×P. fulvidraco ♀ was highest, 18.36 (?2.15)%;the heterosis of condition factor did not vary significantly;both average heterosis and over-better- parent heterosis gradually decreased over time. Results of our study can be favorably relevant to the aquaculture of these species.