Abstract
Meiosis in Rosa rugosa diploids, colchicine tetraploids and their triploid hybrids has been compared. Attention is given to budding-like phenomena and migration into the cytoplasm of nucleoli in prophase of the first meiotic division and to the appearance of nucleoli-like bodies. These phenomena are consistently met with in the genus Rosa. Nucleoli-like bodies are especially characteristic for telophase 1 and 2, interkinesis and the beginning of tetrad formation. A special diffuse stage in prophase 1, usual for the genus Rosa, is described, during which the classical chromosomal stains leave the chromosomes completely or almost completely unstained. When staining methods regarded as selective for RNA are used, fibrillar structures appear in the nucleus during prophase 1. Three possible similarities with meiosis in oocytes of zoological material are discussed: (1) parallels between the diffuse stage and the lampbrush state of chromosomes, (2) the formation of nucleoli-like bodies and (3) intense staining of cytoplasm with RNA-staining methods.
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