A cytological study was made of certain diploid and tetraploidAvena hybrids. Quadrivalents were observed during meiosis in all the hybrids except one diploid hybrid which was highly self-fertile. The quadrivalents in the majority of cases were of the closed ring type, and were orientated on the metaphase plate either disjunctionally or non-disjunctionally; the ratio being approximately 2:1. The significance of the orientation of the quadrivalents upon the subsequent fertility of the plants is discussed.
The formation of the quadrivalents is explained on the basis of segmental interchange.
It is concluded from the investigation that there are definite structural differences between the chromosome complements of the parental species used in obtaining the hybrids studied. These structural differences take the form of relatively interchanged chromosome segments and small inverted regions between certain pairs of chromosome present in the hybrid plants.
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Ellison, W. The occurrence of quadrivalents in certain diploid and tetraploidAvena hybrids. Journ. of Genetics 36, 515–522 (1938). https://doi.org/10.1007/BF02982463
- Hybrid Plant
- Pollen Mother Cell
- Metaphase Plate
- Diploid Hybrid
- Homologous Segment