TY - JOUR

T1 - Genome balance in six successive generations of the allotetraploid Festuca pratensis x Lolium perenne

AU - Bocianowski, J.

AU - Joks, W.

AU - Zwierzykowska, E.

AU - Jones, R. Neil

AU - Kosmala, A.

AU - Zwierzykowski, Z.

N1 - Zwierzykowski, Z., Kosmala, A., Zwierzykowska, E., Jones, N., Joks, W., Bocianowski, J. (2006). Genome balance in six successive generations of the allotetraploid Festuca pratensis x Lolium perenne. Theoretical and Applied Genetics, 113, 539-547.
Sponsorship: Leverhulme Trust

PY - 2006/6/14

Y1 - 2006/6/14

N2 - In the allotetraploid, Festuca pratensis
Huds. (2n = 4x = 28) £ Lolium perenne L. (2n = 4x
= 28) the balance of chromatin, as determined by
GISH, changes over successive generations of open
pollination in favour of L. perenne. There is extensive
recombination between chromosomes of the two
parental genomes, as well as substitution of whole Festuca
chromosomes by whole Lolium chromosomes. The
total number of Lolium chromosomes increased from a
mean 14.36 in the F2 to 16.26 in the F6, and the total
number of Festuca chromosomes decreased correspondingly
from a mean of 13.57 to a value of 11.56.
The number of recombinant chromosomes and recombination
breakpoints per genotype also increased from
generation to generation, although the respective
values of both characters were higher for Festuca
(0.86–8.41 and 1.14–15.22) than for Lolium (0.68–4.59
and 0.68–6.0). The proportion of total genome length
contributed by the L. perenne chromatin increased
from about 50% in F2 to 59.5% in F6. The results are
based on the sample of 134 plants studied (26–28 plants
per generation), and are discussed in terms of the dominance
of Lolium chromosomes over those of Festuca,
and possible mechanisms underlying this phenomenon
of chromatin substitution.

AB - In the allotetraploid, Festuca pratensis
Huds. (2n = 4x = 28) £ Lolium perenne L. (2n = 4x
= 28) the balance of chromatin, as determined by
GISH, changes over successive generations of open
pollination in favour of L. perenne. There is extensive
recombination between chromosomes of the two
parental genomes, as well as substitution of whole Festuca
chromosomes by whole Lolium chromosomes. The
total number of Lolium chromosomes increased from a
mean 14.36 in the F2 to 16.26 in the F6, and the total
number of Festuca chromosomes decreased correspondingly
from a mean of 13.57 to a value of 11.56.
The number of recombinant chromosomes and recombination
breakpoints per genotype also increased from
generation to generation, although the respective
values of both characters were higher for Festuca
(0.86–8.41 and 1.14–15.22) than for Lolium (0.68–4.59
and 0.68–6.0). The proportion of total genome length
contributed by the L. perenne chromatin increased
from about 50% in F2 to 59.5% in F6. The results are
based on the sample of 134 plants studied (26–28 plants
per generation), and are discussed in terms of the dominance
of Lolium chromosomes over those of Festuca,
and possible mechanisms underlying this phenomenon
of chromatin substitution.

U2 - 10.1007/s00122-006-0322-2

DO - 10.1007/s00122-006-0322-2

M3 - Article

C2 - 16773330

SN - 1432-2242

SP - 539

EP - 547

JO - Theoretical and Applied Genetics

JF - Theoretical and Applied Genetics

ER -