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Dr. James G. Harris

Rediscovery of Braya pilosa
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DNA Sequence Data

C. Favarger, A. W. Johnson, and J. G. Packer found a correlation between plant ploidy level and habitat stability. Diploids were more likely to be found on stable habitats, while polyploids were more frequent on habitats with a history of disturbance.

Braya pilosa likely weathered the Pleistocene on the relatively stable habitats available near Cape Bathurst, but it has apparently been unable to expand its range in recent times. It may, however, have served as a parent species to some of the more widespread polyploids in the genus.

DNA sequence data suggest that B. thorild-wulffii may have served as a parent to other Braya species of higher ploidy level. If DNA of B. pilosa were available, and if the species is indeed a parent to B. thorild-wulffii, it could provide significant insight into phylogenetic relationships within Braya and between Braya and other genera in the Cruciferae.

ITS Sequence Additivity in Braya

The table shows that B. longii, B. farnaldii, and B. galbella
could have acquired genes from both B. thorild-wulffii
and from something related to B. humilis, B. linearis, or B. alpina
Position 14 56 117 142 143 527 554 556 576 579 583
B. thorild-wulffii A G C A C T T T G T T
B. longii A & C G & C C & T A & G C & T T & G T & A T & C G & T T & C T & C
B. fernaldii A & C G & C C & T A & G C & T T & G T & A T & C G & T T & C T & C
B. glabella A & C G & C C & T A & G C & T T & G T & A T & C G & T T & C T & C
B. humilis C G C G C G A C T C C
B. linearis C G C G C G A C T C C
B. alpina C G C G C G A C T C C