A retrotransposon-like sequence linked to the S-locus of Nicotiana alata is expressed in styles in response to touch.
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 a genomic clone for the N. alata s6-ribonuclease (S6-RNase), a gene required for self-incompatibility 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 second, partial Tna1 elements. 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.
Royo
J
J
Plant Cell Biology Research Centre, School of Botany, University of Melbourne, Parkville, Victoria, Australia.
Nass
N
N
Matton
D P
DP
Okamoto
S
S
Clarke
A E
AE
Newbigin
E
E
D000595:Amino Acid Sequence; D001483:Base Sequence; D015152:Blotting, Northern; D015139:Blotting, Southern; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D004254:DNA Nucleotidyltransferases / Q000737:chemistry / Q000235:genetics; D017931:DNA Primers / Q000737:chemistry; D018628:Gene Dosage; D018506:Gene Expression Regulation, Plant / Q000235:genetics*; D005838:Genotype; D019426:Integrases; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D010947:Plants, Toxic; D016133:Polymerase Chain Reaction; D012091:Repetitive Sequences, Nucleic Acid / Q000235:genetics; D018626:Retroelements / Q000235:genetics*; D012260:Ribonucleases / Q000235:genetics / Q000378:metabolism; D016415:Sequence Alignment; D017421:Sequence Analysis; D014026:Nicotiana / Q000235:genetics*; D014110:Touch
D017931:DNA Primers; D018626:Retroelements; D004254:DNA Nucleotidyltransferases; D019426:Integrases; D012260:Ribonucleases; C022542:ribonuclease S