Hi Templeton, from what I've read the Pur purple gene behaves a bit differently. Lamprecht - who did extensive work on peas (mostly in German) identified three degrees of pod colouration related to multiple alleles at the pur locus. Pur with full colouration, pur a and pur b with progressively less colouration and pur with no colouration. My guess is you've had a spontaneous mutation at this locus. Let me know if you want the reference.
Yes please Steve, that would be interesting to read.
Steve, the urls would be really appreciated, I can't find the right article, if you have a mo, please
Steve1 hasnt been back online, galina. I guess he might be referring to the references on the jic pisum database, listed at the bottom of the page under each gene entry. Just had a quick browse, and noted another gene of interest, Astr, purple striped pods. How did I miss that one?
Pod parchment and vascular bundles orange - their description that the pod appears dull makes sense if green over the top - might not be much interest in a snowpea = no parchment, but could look interesting in a yellow podded sheller...Wonder where we could get it... T
Sorry T, dropped off the face for a bit. If you are into anthocyanins, pink flowers and recessive b genes this is for you. It's a Ph.D thesis, but has the reference for the Lamprect paper and much much more including flower colours and genotypes. (Google Statham anthocyanins UTas) URL won't paste. Of course the other option with the purple pod mischief is an outcross. I ended up with a purple splash on a single green pod and a purple funiculum on another (out of 50 f2 plants) in my in a golden snap project. F1's were grown together in the field. I saw blue banded bees working all the beans - tepararies, seven years and vulgaris, but never observed them on the peas. The bean grow out from that over the next year or two offers some mind boggling genetics. Have seen the same on purple podded Dutch but I don't bag flowers as a general rule so I can't call mutation. Cheers
Post by philagardener on Oct 31, 2015 9:07:51 GMT -5
Haven't poked through a typed thesis in a while; thanks for the pointer. The Google address was a mess, but this link should get folks there. Seems to have attracted recent interest based on the download stats.
T, Dr. Statham was in Tas; unfortunately, she appears to have passed in 2014 (obit).
Hey Phil, hmm I had missed the obituary. Sad. The Lamprecht purple pod explanation in the previous post is on p26 and a passing note on purple pod mutation which references Lamprecht (1953) that purple pods may mutate to green by as much as 40% p55, genotypes by flower colour p 17-23, red pod types fig 20-23 p 51-52. Plenty more in there though. I think the same thing on some purple podded Dutch peas from 2014.
Wow, thanks steve1, and philagardener, just read the first half, most interesting. Can't believe I haven't come across this work before, tho I must say I haven't delved into thesis searches. Now I need to try to get my hands on some b genes.... steve1, I've got blue banded bees in the garden at the moment, will have to have a look for activity around my pea flowers, but I suspect variations in coloration are probably spontaneous reversions, or pur-a or pur-b expressions. I'm glad I put in a late season test plot of F2 PuPurXgp growouts. steve1, where are located? t
I'm in Melbourne T. I'm not entirely convinced about the outcrossing but have not better explanation for the two plants in my golden line. What makes it harder to believe is that this was a late sowing flowering in December, and the flowers were so small and closed when pollen was dehiscing that crosses were nearly impossible to perform. Numbers are too far out to be much else. Oh well can't explain everything!
I grew out some Angela's Blue a few years ago at the beginning of my experiments, and did note an Angela's Half Blue in my growouts- I had forgotten it until now. I think there are spontaneous reversions or instability at that variable Pur locus. t
steve1, are still working on a golden snap project? Like T, I've been working on a few pea crosses though I'm much slower than he is. My purple snap project is on hold and my golden snow project has only restarted this year. Oh well, that's the way of it.
Ray Silty loam over clay, pH 5.5, altitude 1000m, latitude 30deg south, 150 frost free days.
raymondo, got my first decent yellow snap six weeks ago. A few nice powdery mildew resistant snows fell out as well for further evaluation. Hoping there will be some more nice snaps in that group too. Haven't put much work into a lone purple snap line - one will likely come out of the red project. Saying that I did a cross just last week for a stringless purple snap line...