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COMPARISON AND ANALYSIS ON THE CHROMOSOME C-BANDING PATTERNS OF LIP APHIS ERYSIMI KALTENBACH AND APHIS CRACCIVORA KOCH

The C-banding patterns of Aphis craccivora and Lipaphis erysimi are investigated by the C-banding technique, and the chromosome C-banding patterns are analysed. A comparison of the karyotypes of the two species of aphids reveals slight difference in the 4th pair of chromosomes. But there are obvious differences in their band patterns. Lipaphis erysimi have two pairs of holocentric chromosomes, which are absent in Aphis craccivora. When the 4th pair of chromosomes of Aphis craccivora are compared with those of Lipaphis erysimi, the latter has a C-band in each terminal of the 4th pair chromosomes which is lacked in the former. But the band pattern of the 2nd pair of chromosomes of Lipaphis erysimi is similar to that of the 2nd pair of chromosomes of Aphis craccivora. According to the C-bandin patterns of the two species of aphids, their phylo-genetic relationship is discussed.