Citrullus属の細胞遺伝学的研究〔英文〕-5-

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Meiosis and fertility in six Japanese varieties of C. vulgaris and C. colocynthis No. 1 was studied with diploids and induced autotetraploids.1. Meiosis in diploid C. vulgaris and C. colocynthis was normal and pollen fertility was found to be more than 90%.2. At MI in PMCs of induced autotetraploid C. vulgaris and C. colocynthis varying numbers of quadrivalents, trivalents and univalents besides bivalents were observed, the configuration being either 11IV or its derivatives. The frequency of quadrivalents per sporocytes was higher in autotetraploid C. colocynthis than in autotetraploids of C. vulgaris. Among the autotetraploids of six varieties of C. vulgaris no remarkable difference was found. Various types of quadrivalents, most frequently zigzags and single rings were observed. Trivalents were infrequent. One or two univalents per sporocyte were frequently observed.3. At the stage between AI and quartet formation, various abnormalities were observed. Lagging and chromosome bridges were observed at AI-TI and AII-TII. Micronuclei were found at interkinesis and at quartet stage.4. Pollen and seed fertilities were higher in the diploids than in the autotetraploids. Seed fertility was higher in autotetraploids of C. vulgaris than in the autotetraploid of C. colocynthis. Seed fertility of the intervarietal autotetraploid hybrid“Fuken”was higher than that of the parental varieties.
日本遺伝学会の論文