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Post by keen101 (Biolumo / Andrew B.) on Dec 28, 2016 18:37:34 GMT -5
Some of the seed catalogs are saying that the variety "Sugar Daddy" is
Not sure if stringless is the same as fibreless or not. Anybody know?
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Post by templeton on Dec 28, 2016 23:09:32 GMT -5
keen101 (Biolumo / Andrew B.), a stringless pea was described about 50 years ago - supposedly without the fiber strip down the pod seams. I think i recall that is was a poor producer. It was subsequently lost, since the variety it was discovered in fell out of catalogs. Maybe someone's Aunt Brunhilda is still growing it in an obscure Bavarian mountain garden..  I think it described in a german paper, but don't trust me. Maybe Sugar Daddy is a new discovery or re-discovery (We will never know since the original genes have been lost)...or someone has visited Aunt Brunhilda... T Edit: see below for clarification/correction.
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Post by templeton on Dec 28, 2016 23:10:53 GMT -5
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Post by templeton on Dec 28, 2016 23:17:52 GMT -5
keen101 (Biolumo / Andrew B.)..well i did a search on my computer and found the paper. I was partly right, and partly wrong. "Lamprecht (1938) described a spontaneous mutation in which the fibrous string along the sutures and adjacent to the lateral carpellary vascular bundles is absent, i.e., the pods are stringless. He named this recessive gene sin, but it has apparently been lost. Wellensiek (1971) recovered another stringless mutant in the M2 of ethylenimine-treated ‘Dominant’. In a brief note, he mentioned the mutant and that its expression depended on high temperature (³ 21C)." "A reduction in pod size, plant height, and number of wrinkled seed segregates was associated with stringlessness." The paper is "J. AMER. Soc. HORT. SCI. 117(4):628-632. 1992. Inheritance of Stringless Pod in Pisum sativum L. Rebecca J. McGee1 and James R. Baggett " I can send you the pdf if you like. pm me. T
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Post by keen101 (Biolumo / Andrew B.) on Dec 29, 2016 0:16:21 GMT -5
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Post by raymondo on Dec 29, 2016 1:29:29 GMT -5
I grew Sugar Sprint which is touted as stringless. It had ver poor germintaion and lousy production. I didn't persist with it.
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andyb
gardener
Posts: 179
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Post by andyb on Dec 30, 2016 19:23:46 GMT -5
There's a webinar by Jim Myers, of Oregon State University, with a few slides about the sin2 gene. Apparently it's recessive and slows down pollen tube growth, so you get nonstandard segregation at the F2 and have to be clever if you want to use it in breeding. The relevant slides start at 13:39: www.youtube.com/watch?v=J9pYKgt0VHo |
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Post by keen101 (Biolumo / Andrew B.) on Dec 31, 2016 16:51:35 GMT -5
There's a webinar by Jim Myers, of Oregon State University, with a few slides about the sin2 gene. Apparently it's recessive and slows down pollen tube growth, so you get nonstandard segregation at the F2 and have to be clever if you want to use it in breeding. The relevant slides start at 13:39: www.youtube.com/watch?v=J9pYKgt0VHo Thanks Andy! That video was actually really good. Quite excellent. I particularly enjoyed the little illustration about how to identify pp from vv phenotypes and the mentioning of the linkage of vv to short plants. There was a lot of other really good stuff in there too toward the end. I think i will watch it again. maybe even take a screenshot. To those that are following this thread i recommend you watch the video mentioned above. like the fact that thick pod walls require the recessive gene "n". I think this is what gives true snap peas that juicy crunch. But honestly i'm not sure all the snaps have this. I don't know though. data.jic.bbsrc.ac.uk/cgi-bin/pgene/default.asp?ID=484 |
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