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This paper presents the results of the study on morphological differentiation of seeds of five Polish species of the genus Sorbus L. (S. aria (L.) Crantz, S. aucuparia L. Emend. Hedl., S. chamaemespilus (L.) Crantz, S. intermedia (Ehrh.) Pers. and S. torminalis (L.) Crantz). The biometric data of 1980 seeds were subjected to multivariate statistical analysis in attempt to define intraspecific variation...
The distribution of heterochromatin in mitotic chromosomes was studied in five inbred lines of rye Secale vavilovii Grossh. (nos. 52, 109, 116, 121 and 225). An additional heterochromatin band was found on the long arm of one of the chromosomes of pair 2R, at an average distance of 2.08 µm from the centromere. After the plants with an additional band on 2R were reproduced, plants with two chromosomes...
Meiosis was observed in pollen mother cells in plants of four rye Secale vavilovii Grossh. lines (nos. 52, 109, 116, 225). The behavior of 2R chromosomes with additional heterochromatin, and of other chromosomes, was observed in diakinesis, metaphase I, anaphase I and anaphase II. 2R chromosomes with additional heterochromatin formed ring and rod bivalents without disturbances. Some other chromosomes...
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