[Dynamics of the induced chromosomal instability in welsh onion (Allium fistulosum L.): gamma irradiation of the seeds of different storage periods].
The chromosome aberrations in root meristem cells of welsh onion (Allium fistulosum L.) seeds after gamma-irradiation (5 and 10 Gy) of different-aged seeds (7, 19, 31, 43 and 55 months of storage) were studied. The irradiation dose of 5 Gy significantly increased the frequency of aberrant anaphases (FAA) for 31- and 43-months seeds; the dose of 10 Gy significantly increased the FAA in seeds of all age groups. The irradiation of young (7 months) seeds resulted in decreasing of the fraction of bridges to the control level of the old (55-months) seeds for the dose of 5 Gy and below the control level of the old seeds--for the dose of 10 Gy. Some peculiarities of cytogenetic parameters of genome instability and the germinating capacity of the seeds made it possible to suppose that the third year of storage is a critical period for the welsh onion seeds.
Lazarenko
L M
LM
Bezrukov
V F
VF
D000490:Allium / Q000235:genetics / Q000254:growth & development* / Q000528:radiation effects; D043171:Chromosomal Instability / Q000235:genetics / Q000528:radiation effects*; D032461:Chromosomes, Plant / Q000235:genetics / Q000528:radiation effects; D004307:Dose-Response Relationship, Radiation; D005720:Gamma Rays; D018519:Meristem / Q000235:genetics / Q000254:growth & development / Q000528:radiation effects; D012639:Seeds / Q000235:genetics / Q000254:growth & development / Q000528:radiation effects; D013997:Time Factors