Meiosis in Untreated and Irradiated Cyperus eragrostis Vahl

抄録

A cytological investigation of meiosis in seed irradiated Cyperus eragrostis has shown that the diffuse centromeric type of chromosome organisation leads to the formation of inviable chromosome complements, in which complex configurations resulting from stickiness as well as pairing of homologous regions, and numerous fragments, persist to the formation of pollen grains.
At the higher doses, however, there is complete sterility, and low fertility even at the lower doses. The small numbers of M₂ and M₃ plants produced at lower doses show much reduced chromosomal abnormalities, indicating severe selection among the gametes and zygotes formed.
There is little advantage in terms of survival from radiation damage, resulting from the possession of the diffuse centromere.