Antirrhinum striatum/pseudomajus
One of the most dynamic systems at present is Antirrhinum striatus/pseudomajus. The two species are thought to have hybridized in this area (Espinosa, Girona, Spain), with pollinators playing their part in the hybridization.
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The researcher always assumes that two closely related species interbreed, thus creating a zone with hybrid forms. So far, so good. - Now, this zone is altering. And that within ten to fivteen years.
This dynamic raises doubts about whether this is the outcome of hybridization and gene flow.
For a recent study, see this pathbreaking and excellent thesis of
- asymmetric distribution - el/el deficit
The summary of the analyses presented in this thesis demonstrates that the genetic structure of plant individuals in this transition zone between Toses and Planoles needs further investigation to unravel completely.
Due to the exponentially growing amount of genomic information on the Internet (https://www.ncbi.nlm.nih.gov/, https://www.ebi.ac.uk/ena/browser/home) it is now possible to use this information source for independent genetic analyses.
STR 53,016,900 Vers.3 Amajus
In ROS1, the intron varies among species, specifically A. pseudomajus, A. striatum, and intermediate color morphs. It consists of a TTATTATTA-STR that differs in length across these varieties.
All varieties retain almost the same exon information. This consistency also applies to Eluta, which functions as an anthocyanin repressor. In this case, a TATA-STR of varying lengths is present within one intron. These short tandem repeats (STRs) may act as regulators for MYB proteins, modulating their activity. Also, the promoter is slightly different. So literally speaking, the promoter is the on-off switch, whereas the short tandem repeat is the tuning knob.
ROS1 and its alleles can differ primarily in the number of CGGG repeats in the promoter region, the length of TAT repeats in the intron, and the presence of distinct motifs at the C-terminal end. We propose that a straightforward algorithm could be used to create an activated ROS1-Myb from an inactive ros1-MYB.
This information is available.
ERX2757451 YP1;
ERX2757452 YP2;
ERX2757453 MP2
ERX2757454 MP4
ERX2757455 CIN_D209
ERX2757456 ML_D210
ERX2757457 CAM_D217
ERX2757458 CHI_D218
ERX2181078 MP11
ERX2181077 YP4
Up to 50-52 genomes from individuals are pooled at each site. So, there will not be
a clear STR picture. See below for ELUTA
and A. striatum.
TATA_STR in intron of ELUTA
STR ± 53,190,215 Vers.3 Amajus
The hybrid origin model already exists. We can also offer a transit model to explain the variety of color phenotypes seen in the transition zones. In this model, STR (short tandem repeats) within MYB introns that spontaneously change their length may gradually bring about the new pseudomajus shape. Note: In-between forms do not strictly follow the Mendelian LAW.
Go to more details here