Ai. Shchapova et al., TRANSMISSION RATE OF CHROMOSOMES 5A, 5D, AND 5R THROUGH GAMETES OF WHEAT-RYE DI-MONOSOMICS, Genetika, 31(11), 1995, pp. 1529-1533
The role of chromosomes of wheat and rye homeological group 5 in trans
mission of univalents through gametes was studied in the following whe
at-rye di-monosomics Triticum aestivum L. var. Saratovskaya 29 - Secal
e cereale L. var. Onokhoiskaya: (1) di-mono 5R-5D 19 '' w + 1 '' 5A 1'5D + 1'5R; (2) di-mono 5R-5A 19 '' w + 1 '' 5D + + 1'5A + 1'5R; (3)
di-mono 5A-5D 19 '' w + 1 '' 5R + 1'5A + 1'5D. The results of cytologi
cal and phenotypic analysis of the di-monosomics and their progenies o
btained by self-pollination showed that univalent chromosomes 5A, 5D,
and 5R were transferred with various frequencies through gametes of di
fferent aneuploids. Thus, transmission frequencies of univalent chromo
some 5A through maternal + paternal gametes in 5R-5A and 5A-5D were eq
ual to 54.22% and 17.27%, respectively. Therefore, increasing the of d
ose of 5R chromosome and reducing the 5D dose resulted in a 3.14-fold
decrease in transmission frequency. Univalent chromosome 5R was transm
itted with approximately the same rate in both di-mono 5R-5D and 5R-5A
; differences in the number of chromosomes 5A and 5D did not affect th
e transmission frequency of rye chromosome 5R. It was also found that
two different univalents of the di-monosomics were distinguished by th
eir transmission rates, which differed by the factor 1.96 and 3.94 in
di-mono 5R-5A and 5A-5D, respectively. In di-mono 5A-5D with two 5R do
ses, univalent chromosome 5D was transmitted through 68.18% of gametes
, whereas in 5A, only through 17.27%. The results obtained allowed us
to conclude that, against the same genomic background, the transmissio
n rate is specific for each univalent.