Cytological studies in the genus Medicago linn.

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概要

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• 1. In the genus Medicago male meiosis was studied in 14 species and mitosis with the help of root tips was studied from 19 collections belonging to 15 species. Most of the species were diploids having n=7 or n=8, only two species (M. sativa and M. scutellata) were tetraploids having n=16.2. Chiasmata frequency/bivalent varied from 1.77 (M. tornata) to 2.18 (M. scutellata).3. Total chromatin length varied from 14.36μ (M. tuberculata) to 48.56μ (M. sativa Coll. no. 1766).4. On the basis of karyotypes, species were classified according to the classification of Stebbins (1971). Only four of the 12 categories were represented by the species examined, indicating that the degree of asymmetry was low.5. Accessory chromosomes were recorded from root tip cells in four taxa belonging to three species (M. intertexta, M. littoralis and M. tornata).

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財団法人 日本メンデル協会 | 論文

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