ISSN:
1432-2242
Keywords:
Rye
;
B chromosomes
;
Synapsis
;
Interlocking
;
Non-homologous pairing
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract In order to elucidate the possible effects of rye B chromosomes (Bs) on synapsis and metaphase-I associations of the A set, a comparative study between pachytene and metaphase-I-cells of rye plants carrying different numbers of Bs (0–8) has been carried out. The number of Bs was found to be positively correlated with the frequency of synaptic irregularities of the A set, i.e. multivalents and foldback pairing, and with the frequency of pachytene interlockings. It is proposed that interlockings are the origin of these irregularities because both appeared in close proximity in many nuclei. Examples of A-B pairing are described. The frequency of synaptic abnormalities seems to be unrelated to the mean of A chromosome-bound arms at metaphase I.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00223737
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