It is fantastic: on the one hand, we have old distribution literature of Penstemon dating back to the 1950s of last century. But on the other hand, we have the newest tools to find genomic information in numerous species. We aim to unravel the difference between Penstemon species with no anthocyanin in their flowers and those with well-active anthocyanin production in the petals. This way, we can jump off some beautiful molecular mechanisms.
We start to illustrate the ROS1-like transcription factor in Penstemon smallii. This MYb is responsible for the blue and red coloration of the Penstemon petals. The T-chain and A-chain inserts within both introns may be coded regulator strings to directly influence the MYB factor. Chromosome 8: 33,605,966-33,608,500 ACJIZ3-014592 ≈ MYB transcription factor Solanum lycopersicum
On chromosome 2, an R2R3MYB factor similar to "ROS2" is found. Notably, there is a reverse hairpin within the first intron (double fleshed arrow).
(In Genome DATA Viewer search assembly: ACJIZ3_002330)
An EL-like ortholog R2R3MYB is found on Chromosome 8. A very long TATA hairpin manifests in intron 2. (Zoom to pos. 33,426,136 to see the long TATA string.)
Another R2R3-MYB factor in the proof is responsible for anthocyanin-colored petal veins in Penstemon. The long "dirty" T-string within the first intron may influence the activity of the holding gene.
One more factor need to be included. The orthologs of the SULF factor is still missing.
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