All-Union Inst. Agric. Biotechnology
Krasnodar Research Institute of Agric.
Development of heterochromatin polymorphism in inbred lines
--A. B. Romanova, D. M. Atayeva, V. S. Shcherbak and M. V. Chumak
When C-heterochromatic patterns were compared in root-tip mitotic chromosomes of B55, W132, H95, Mo17, W64, B84 and Cg25 inbreds, the size and distribution of heterochromatin blocks significantly differed in homologous chromosomes. Similar observations were previously reported in rye inbreds (Weimarck, Hereditas 79:293, 1975; Lelleg et al., Can. J. Genet. Cytol. 20:307, 1978).
In an attempt to determine more precisely when this intra-inbred polymorphism
might appear, we investigated seven dihaploid lines produced in Krasnodar
and once again found that homologous chromosomes differed by their heterochromatic
patterns. We suggest that the physiological implications of the de novo
development of heterochromatin polymorphism described above could possibly
include mechanisms of both adaptation and somaclonal variation in maize.
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