胡子鲇×革胡子鲇F1与其亲本的形态学和细胞学分析比较
ANALYSIS AND COMPARISON OF MORPHOLOGY AND CYTOLOGY BETWEEN THE F1 HYBRID CATFISH(CLARIAS FUSCUS�i>C. LAZERA) AND ITS PARENTS
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摘要: 胡子鲇×革胡子鲇的绝大多数形态学性状兼具双亲的特点。其中可数性状较多偏近母本,体型性状则大约有一半偏近父本,一半偏近母本,其中有些性状表现为超亲偏离。核型也具有双亲的特点,染色体组可分为父本组和母本组。减数分裂前期出现数目不等的单价体、二价体以及三联以上的多价体环或链。形态和核型特点表明杂交种为真杂种胡子鲇。本文还对亲本核型的演化途径和杂种的育性以及在育种上的意义作了讨论。Abstract: Analysis and comparison of morphology and cytology were made between the F1 hybrid catfish (C. fuscus?i>C. lazera) and its parents using conventional and karyotype analysis methods. The results are as follows: Almost all morphological traits of the hybrid show the characteristics of both parents. The hybrid is closer to the female parent (C. fuscus) in 3 countable characters and 6 typological characters, and to the male parent (C. lazera) in one countable character and 8 typological characters. Some important typological characters, e.g., body height/total length and body width/total length, in the hybrid are closer to those in the female parent. The hybrid is also similar to the female parent in condition factor. The male hybrid is sterile. The karyotype of the hybrid has the characteristics of both parents. The chromosomes (2N=56) can be classified into 2 groups i.e., group F and group L, which have the same chromosome sets of the female and male parent respectively.Some univalents, bivalents and multivalents in ring or chain shape are observed in metaphase I in the hybrid. Some problems about the evolution of the parent's karyotype and the factor causing the sterility of the male hybrid are also discussed.
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Keywords:
- Clarias fuscus?i>C. lazera /
- C. fuscus /
- C. lazera /
- Morphology /
- Cytology /
- Karyotype
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