ISSN:
1617-4623
Schlagwort(e):
Key words gypsy-like retrotransposon
;
Nicotiana alata
;
S-locus
;
Touch-inducible
;
Pollination
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Biologie
Notizen:
Abstract We have identified a family of repetitive sequences in the genome of Nicotiana alata named Tna1 (Transposon of N. alata). The first element we characterised was on a genomic clone for the N. alata S6-ribonuclease (S6-RNase), a gene required for selfincompatibility in this species. The DNA sequence of this element resembles the integrase domain of retrotransposons of the gypsy class and is most similar to a retrotransposon from Lilium henryi. A transcript present in N. alata styles (self-incompatibility genotype S6S6) hybridized to Tna1 and accumulated in the style following either pollination or touching. This transcript was cloned from a cDNA library and was encoded by a second, partial Tna1 element. Neither the transcribed sequence nor the original Tna1 element contain an open reading frame or is likely to be able to transpose. The second element was mapped using a population of N. alata plants segregating for alleles of the self-incompatibility locus and is closely linked to the S6-allele. The Tna1 element is present in a number of Nicotiana species and appears to have been active at least twice during the evolution of this genus.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF02174177
