不同近交系数的虾夷扇贝近交衰退研究  

Analysis of Inbreeding Depression in Patinopecten yessoensis Based on Different Inbreeding Coefficient

作　　者：傅强[1] 王师[1] 赵亮[1] 张璐[1] 包振民[1] 

机构地区：[1]中国海洋大学海洋生命学院海洋生物遗传学与育种教育部重点实验室,山东青岛266003

出　　处：《中国海洋大学学报（自然科学版）》2015年第11期43-48,共6页Periodical of Ocean University of China

基　　金：国家自然科学基金面上项目(31272656);留学归国人员科研启动金项目(教外司留[2013]1792号)资助

摘　　要：在虾夷扇贝中通过自体受精构建了近交系数为0.5的自交家系,同时构建了近交系数为0.25的F2代近交家系和杂交对照家系,对生活史不同时期的生长和存活等适应性性状进行了近交效应的研究。研究发现不同的近交系数对不同性状的衰退影响不同：幼虫期生长性状的近交负荷为0.158~0.279,而存活率的近交负荷为0.915~1.101,存活率受近交的影响更大。两种性状的近交衰退从幼虫第16天才开始明显显现,并且近交负荷随着时间都有增大的趋势,到成体时分别增长为0.348~0.588和1.485~3.277。本研究表明,在虾夷扇贝中近交系数越高衰退越严重,存活率性状的衰退相比生长性状更严重,并且近交负荷都随着时间显著增大。This article focuses on inbreeding depression on different traits in the life cycle of Patinopecten yessoensis.Using different mating strategies,we established selfed families with inbreeding coefficient 0.5,F2 families and controlled families respectively.Our study has shown that inbreeding loads of larval growth and survival was 0.158~0.279 and 0.915~1.101.Survival rate suffers more from inbreeding than growth traits.Both traits show an obvious increase with age,which were not significantly different among three groups until 16 days and whose inbreeding loads climbed to 0.348~0.588 and 1.485~3.277 in the adults stage.Our results shows that inbreeding depression is more serious in selfed group with higher inbreeding coefficient than in F2 group,and is more severe in survival traits than in growth traits,both of which increased with age.

关 键 词：虾夷扇贝 自体受精 近交衰退 适应性性状 遗传负荷 

分 类 号：P733.2[天文地球—物理海洋学]