9 Result(s)

Article

Nicotine in floral nectar pharmacologically influences bumblebee learning of floral features

Many plants defend themselves against herbivores by chemical deterrents in their tissues and the presence of such substances in floral nectar means that pollinators often encounter them when foraging. The effe...

D. Baracchi, A. Marples, A. J. Jenkins, A. R. Leitch, L. Chittka in Scientific Reports (2017)

Article

Silenced rRNA genes are activated and substitute for partially eliminated active homeologs in the recently formed allotetraploid, Tragopogon mirus (Asteraceae)

To study the relationship between uniparental rDNA (encoding 18S, 5.8S and 26S ribosomal RNA) silencing (nucleolar dominance) and rRNA gene dosage, we studied a recently emerged (within the last 80 years) allo...

E Dobešová, H Malinská, R Matyášek, A R Leitch, D E Soltis, P S Soltis… in Heredity (2015)

Article

The asymmetric meiosis in pentaploid dogroses (Rosa sect. Caninae) is associated with a skewed distribution of rRNA gene families in the gametes

In pentaploid dogroses, Rosa section Caninae (2n=5x=35), the pollen transmits one basic genome (x=7) derived from the seven segregating bivalents, whereas the egg transmits four basic genomes (4x=28) one set deri...

A Kovarik, G Werlemark, A R Leitch, K Souckova-Skalicka, Y K Lim, L Khaitová… in Heredity (2008)

Article

Conserved gene order belies rapid genome turnover: The dynamic interplay between genomic DNA and the outside world

A R Leitch in Heredity (2007)

Article

Evolutionary implications of permanent odd polyploidy in the stable sexual, pentaploid of Rosa canina L

In Rosa canina (2n=5x=35), the pollen and ovular parents contribute, respectively, seven and 28 chromosomes to the zygote. At meiosis I, 14 chromosomes form seven bivalents and 21 chromosomes remain as univalents...

K Y Lim, G Werlemark, R Matyasek, J B Bringloe, V Sieber, H El Mokadem… in Heredity (2005)

Article

The origin and evolution of geminivirus-related DNA sequences in Nicotiana

A horizontal transmission of a geminiviral DNA sequence, into the germ line of an ancestral Nicotiana, gave rise to multiple repeats of geminivirus-related DNA, GRD, in the genome. We follow GRD evolution in Nico...

L Murad, J P Bielawski, R Matyasek, A Kovarík, R A Nichols, A R Leitch… in Heredity (2004)

Article

Ribosomal DNA evolution and gene conversion in Nicotiana rustica

Genomic in situ hybridisation was used to confirm that Nicotiana rustica (2n=4x=48) is an allotetraploid between N. paniculata (2n=2x=24, maternal P- genome donor) and N. undulata (2n=2x=24, paternal U-genome don...

R Matyasek, K Y Lim, A Kovarik, A R Leitch in Heredity (2003)

Article

Evolution and structure of 5S rDNA loci in allotetraploid Nicotiana tabacum and its putative parental species

Nicotiana tabacum (tobacco) is an allotetraploid derived from ancestors of the modern diploids, N. sylvestris and N. tomentosiformis. We identified and characterized two distinct families of 5S ribosomal DNA (rDN...

J Fulnec̆ek, K Y Lim, A R Leitch, A Kovar̆ík, R Matyás̆ek in Heredity (2002)

Article

Detection and characterization of 1B/1R translocations in hexaploid wheat

Total genomic DNA from rye was labelled with biotin and used as a probe for in situ hybridization to show the sizes and translocation points of the rye chromosome segments in five wheat varieties which carry a tr...

J S Heslop-Harrison, A R Leitch, T Schwarzacher, K Anamthawat-Jónsson in Heredity (1990)