Davies KM 1993
- Authors:
Davies KM.
- Title:
A Malus cDNA with homology to the Antirrhinum Candica and Zea A2 genes.
- Reference location:
Plant Physiology. 103(3):1015, 1993 Nov.
Lister C et al. 1993
Lister C et al. 1993
- Authors:
Lister C. Jackson D. Martin C.
- Title:
Transposon-induced inversion in Antirrhinum modifies nivea gene expression
to give a novel flower color pattern under the control of
cycloidearadialis.
- Reference location:
Plant Cell. 5(11):1541-53, 1993 Nov.
- Abstract:
The nivea (niv) gene of Antirrhinum majus encodes chalcone synthase, an
enzyme involved in synthesis of anthocyanin pigments. The nivrec:98 allele
contains a single copy of the transposon Tam3 inserted at the niv locus. A
large chromosomal rearrangement derived from this mutant has been shown to
be flanked by two copies of Tam3. In this study, we compared sequences
involved in this rearrangement with their progenitor sequences and
concluded that the rearrangement is an inversion resulting from an
aberrant transposition occurring shortly after replication of Tam3 that
left both copies of Tam3 active after the rearrangement. Excision of Tam3
from its position adjacent to the niv coding region resulted in a novel
distribution of anthocyanin pigment in the flower tube, caused by the
interaction of the new sequences with the remnant of the niv promoter. The
new sequences upstream of niv serve both to enhance niv transcription and
to redirect the pattern of gene expression, placing niv under the control
of the gene cycloidearadialis, which determines the morphogenetic polarity
of the flower.
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