不同月龄三角帆蚌幼蚌内外壳色相关性分析

Correlation analysis between inner shell color and outer shell color of juvenile mussels at different month ages in Hyriopsis cumingii

供片贝内壳色显著影响所育珍珠颜色,成为珍珠贝重要遗传改良性状,但内壳色度量难度较大,严重限制了选育效率。选用4~8月龄紫色品系和白色品系三角帆蚌幼蚌为实验材料,评价三角帆蚌幼蚌内壳色与外壳色的相关性,结果表明:紫色品系三角帆蚌同时期内外壳颜色参数a^(*)最大相关系数为0.537(P<0.01),出现在6月龄,颜色参数b^(*)最大相关系数为0.724(P<0.01),出现在5月龄;紫色品系三角帆蚌5月龄外壳颜色参数a^(*)和4月龄外壳颜色参数b^(*)分别与8月龄内壳颜色参数呈现最大相关性,分别为0.414(P<0.01)和0.327(P<0.01);白色品系三角帆蚌5月龄外壳颜色参数a^(*)和b^(*)与8月龄内壳颜色参数a^(*)和b^(*)均呈现最大相关性,分别为0.424(P<0.01)和0.326(P<0.05)。综合上述结果,5月龄是通过三角帆蚌外壳色间接评价内壳色的最佳时期。揭示了三角帆蚌幼蚌外壳色与内壳色具有相关性,对指导三角帆蚌内壳色早期选育具有重要意义。

The inner shell color of donor Hyriopsis cumingii,which affects the color of pearls obviously,has become an important trait for genetic improvement of pearl mussels.However,the inner shell color of the mussels is difficult to measure.The measurement difficulties decreased the efficiency of selective breeding.In this study,the 4-8 month-old mussels from purple and white strains were selected for evaluating the correlation between the inner shell color and the outer shell color of mussels.The results are as follows:In purple strain,at 6 months old,the maximum correlation coefficient in a^(*)between outer shell and inner shell,0.537,appeared(P<0.01).At 5 months old,the maximum correlation coefficient in b^(*)between outer shell and inner shell,0.724,appeared(P<0.01).For a^(*),the maximum correlation coefficient between the outer shell of 5-month-old mussels and inner shell of 8-month-old mussels,0.414,appeared(P<0.01).For b^(*),the maximum correlation coefficient between the outer shell of 4-month-old mussels and inner shell of 8-month-old mussels,0.327,appeared(P<0.01).In white strain,for a^(*)and b^(*),the maximum correlation coefficients between the outer shell of 5-month-old mussels and inner shell of 8-month-old mussels,0.424(P<0.01)and 0.326(P<0.05),appeared.In summary,5-month-old is the best time to indirectly evaluate the inner shell color by measuring outer shell color in Hyriopsis cumingii.In this study,we revealed that there is correlation between outer shell color and inner shell color in juvenile Hyriopsis cumingii.The result is of great significance to instruct early selection on inner shell color in Hyriopsis cumingii.