科研之友
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摘要
The nacre color of the pearl mussels is one of the most important traits for the pearl industry. In this study, to evaluate the effectiveness of the nacre color selection of the freshwater pearl mussel Hyriopsis cumingii, the characteristics of nacre color from a purple, white, and a commercial farmed strain were detected, respectively, by measuring the color parameters of CIEL* a*b* (CIELAB) system. The analysis of the variation among the color parameters showed that the uniformity of the nacre color in purple or white strain had been significantly improved over that of the farmed strain. The principal component analysis indicated that the first principal component (PC1) was most affected by color parameter a* where a positive value indicates a hue of red and a negative value indicates a green in the CIELAB color space. The second principal component (PC2) was most affected by color parameter b* where a positive value indicates a hue of yellow and a negative value indicates blue. The contribution rates of these PCs were 63.64% and 23.81%, respectively. The results also showed that the nacre color was obviously different among purple, white, and farmed strain, and the difference of nacre color between purple and white strain was primarily caused by color parameter a*. The discriminant functions for nacre colors were established and the rate of discriminant accuracy (P-1 and P-2) was 100% for all three strains. The results indicated that purple, white, and farmed strains could be clearly identified and differentiated on the basis of their nacre color, and the traits of nacre color could be purified through selective breeding.
