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<p>In order to cultivate Manila clam varieties in northern China, we crossed the Dalian wild population (referred to as D) and the Weihai wild population (referred to as W) to create a 2×2 complete diallel hybrid. Ultimately, we obtained two hybrid groups (D♀×W♂ (DW) and W♀×D♂ (WD)) and two inbred groups (D♀×D♂ (DD) and W♀×W♂ (WW)). We measured their growth and survival during the larval and juvenile stages and compared the data between hybrid and inbred groups to study the potential heterosis of the hybrid. With the exception of slightly lower values in the WD group, fertilization and hatching rates did not differ significantly among the other groups. However, during the larval stage (days 1–15), we observed significant differences in the growth rate of Manila clam in the hybrid groups at days 1, 3, and 6 of age (<i>P</i>&lt;0.05). Among the groups, the clams in the DW group had the highest survival rate, which was indicative of significant heterosis. After entering the juvenile stage (days 30–120), both hybrid groups showed high heterosis in terms of growth and survival. The DW group had the greatest amount of heterosis for survival performance, and the WD group had the greatest amount of heterosis for shell length and height growth. These results indicated that this hybrid combination had great breeding potential, and provided a useful hybrid strategy for producing genetic improvements in <i>R. philippinarum</i>.</p>

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Heterosis in Growth and Survival of Intraspecific Crosses Between Two Geographically Different Wild Populations of Manila Clam (Ruditapes philippinarum)

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • Hongda Li,
  • Shikang Li,
  • Hong Guo,
  • Shuhang Lv,
  • Bin Wang,
  • Jinhong Bi,
  • Hongtao Nie

摘要

In order to cultivate Manila clam varieties in northern China, we crossed the Dalian wild population (referred to as D) and the Weihai wild population (referred to as W) to create a 2×2 complete diallel hybrid. Ultimately, we obtained two hybrid groups (D♀×W♂ (DW) and W♀×D♂ (WD)) and two inbred groups (D♀×D♂ (DD) and W♀×W♂ (WW)). We measured their growth and survival during the larval and juvenile stages and compared the data between hybrid and inbred groups to study the potential heterosis of the hybrid. With the exception of slightly lower values in the WD group, fertilization and hatching rates did not differ significantly among the other groups. However, during the larval stage (days 1–15), we observed significant differences in the growth rate of Manila clam in the hybrid groups at days 1, 3, and 6 of age (P<0.05). Among the groups, the clams in the DW group had the highest survival rate, which was indicative of significant heterosis. After entering the juvenile stage (days 30–120), both hybrid groups showed high heterosis in terms of growth and survival. The DW group had the greatest amount of heterosis for survival performance, and the WD group had the greatest amount of heterosis for shell length and height growth. These results indicated that this hybrid combination had great breeding potential, and provided a useful hybrid strategy for producing genetic improvements in R. philippinarum.