Genetic Behaviour of Induced Translocation Heterozygote in Poppy

抄録

From among the population obtained from gamma irradiated seeds, a plant having segmental exchanges between heterologous chromosomes was isolated. Gamma ray-induced translocations have been reported in many plant species; however, there is no previous report of the occurrence of induced translocation in poppy. Chromosomal associations in rings and chains along with bivalents and univalents were observed in pollen mother cells (PMCs) during microsporogenesis. In a number of PMCs, only a few bivalents and a high frequency of univalents have also been observed. Various anaphasic anomalies were also taken into account including chromatid bridges, laggards and unequal separations etc. Later stages of meiosis were also found to be highly disturbed. Owing to the high frequency of chromosomal aberrations, the pollen fertility was considerably reduced. Phenotypically, the plant was shorter in height and weaker in comparison to the control population. The study furthermore deals with a brief investigation on the genetic behaviour of this peculiar anomaly and the probable cause of its occurrence.