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Post by steve1 on Mar 23, 2019 0:28:45 GMT -5
They have been working in New Zealand on hemaphrodites. Issai is a hemaphrodite hardy kiwi variety sold in Oz. I just happened to have finished fermenting some hardy kiwi seeds, will sow them soon.
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Post by steve1 on Dec 23, 2018 6:47:57 GMT -5
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Post by steve1 on Dec 23, 2018 6:44:19 GMT -5
Hi William, I was reading some late blight material a few years ago, I recall Iron Lady F1 having two genes for late blight resistance (the one in Legend and another). It also has other pathogen resistances. Might be worth a look.
Cheers Steve
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Post by steve1 on Nov 22, 2018 5:10:09 GMT -5
Hi Oxbow, agree totally the primary function of the slime/goop is to lubricate roots in the soil and likely feed soil bacteria/fungi. It's absolutely likely to be a secondary function thats evolved in the teosinte corn and over expressed in the Sierra Mixe varieties (and possibly others). Just that it's interesting to see it. But it does make you wonder, particularly in the composite Indian corns whether that trait is present even if it's not over expressed as in the Sierra Mixe corns. As far as I am aware from the recent paper no feeder roots are necessary to absorb the fixed N, that happens directly through the prop root and the continual production of the goop is to feed the N fixing bacteria.
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Post by steve1 on Oct 24, 2018 6:46:48 GMT -5
Hi Andi, that goop on the aerial roots caught my attention. Quite possibly that it's a nitrogen fixing trait as outlined in a recent thread. My theory is it only expresses in soils that are N deficient, in the same way that pea rhizobia only fix N in soils that are N deficient. I've seen the anthers off the female infloresence when the weather is cool at maturity, ie very late autumn here. Hope that helps,
Steve
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Post by steve1 on Jul 2, 2018 22:04:55 GMT -5
Hi AndyB, came across this the other day and thought it'd be worth putting it up in here (in case you haven't come across this already). Evidently when crossing vulgaris x coccineus there are three lethal domininant genes or incompatability barriers to get past (crinkle leaf dwarf sub lethal/semi sterile, blocked cotyledon lethal and dwarf lethal). Good news is that one line of vulgaris has been identified with all three of the recessive genes that allow interspecific crosses (ICA Pijao). Theres a few other lines that have some of the recessive characters. See Barriers to Interspecific Hybridization in Crosses between Phaseolus coccineus L. (G35172) and Phaseolus vulgaris L. by F.H. Ferwerda and M. J. Bassett naldc.nal.usda.gov/download/IND22077043/PDFCheers Steve
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Post by steve1 on May 31, 2018 23:38:02 GMT -5
Yes, P.fulvum has an orange coloured flower, two genes as I recall from that Tasmanian PHD thesis. Just a heads up it’s not an easy - straight forward cross. due to inter specific incompatibility. Flowers are small and as a side note the pods have explosive dehiscence. The immature pods taste very pea like and also carry some good (multi gene) resistance (at least in some accessions) to ascochyta which I think templeton might be troubled by... Cheers Steve
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Post by steve1 on May 4, 2018 4:00:53 GMT -5
I know I have a review on all the flowering genes from the tas uni genetics department hiding on my laptop. Let me dig it up. They may still have some germ plasm. Will let you know. Do you know what genes you’re after?
Cheers Steve
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Post by steve1 on Feb 28, 2018 5:35:34 GMT -5
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Post by steve1 on Feb 28, 2018 5:00:30 GMT -5
andyb, nice work so far. What pollen are you trying to germinate there? I'm looking for germ tubes, but can't see any. As I mentioned via pm, getting the recipe right is the issue. It does look like as you've already said you need more sugars or salts to stop the pollen imbibing too much and exploding. Cheers Steve
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Post by steve1 on Feb 20, 2018 4:37:14 GMT -5
templeton, sorry was doing some reading and it's the recessive er1 that's commonly used - not the Er2 I've posted above. Er2 and Er3 though, are described as less effective from what I've read and Er3 is found in Pisum fulvum, so there is some extra joy of interspecific crosses and incompatabilities in that one. Cheers Steve
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Post by steve1 on Jan 26, 2018 4:48:44 GMT -5
Here's a question that popped into my head regarding the maintenance of landrace peas - particularly snows and snaps. Can anyone that maintains these landraces ( Joseph Lofthouse) tell me have you ever encountered full shelling peas in these landraces, as if there is variability in the low parchment gene ie. pV and Pv genotypes the F1 is PV and a full parchment sheller? I guess that 9/16 of the F2 will be low parchment genotypes, but when do you cull the full parchment lines or do you just let them go? Cheers Steve
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Post by steve1 on Jan 14, 2018 15:51:05 GMT -5
Very 'One straw revolution' with the white clover. From memory Fukuoka knocked back the clover before planting crops by flooding his fields for a week. His rice yields on non flooded fields were as high as anywhere else in Japan. I guess if you have enough water for the clover and crops it might work, you might even just be able to mow the clover to knock it back. My guess is that it might take some time to find varieties that perform really well in this situation, but would probably be well worth it.
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Post by steve1 on Jan 14, 2018 5:42:28 GMT -5
Hi Andrew, There are two genes controlling flower number (fn -chr II, fna-chr IV) with the recessive of either one causing two flowers per node, both dominants one flower per node with both homozygous recessive >3 flowers/node -based on Lamprechts 1947 paper - which I haven't read as my guess is its in German. A Russian group seem to be proposing a different (still 2 gene theory for >3 flowers, one dom/one recessive) theory, but their numbers were too low for robust statistical analysis. scindeks-clanci.ceon.rs/data/pdf/1821-3944/2016/1821-39441603116S.pdfThere is also environmental influence of both light intensity and temperature on formation of flowers, and the production of multi flowers does not always equal more pods (the Russian group say the third flower on their 3 flowered genotype rarely makes a pod (though that could well be environmental). Hope that helps. Cheers Steve
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Post by steve1 on Dec 19, 2017 6:36:24 GMT -5
@templton and galina, ten years is pretty standard for a commercial operation, though there are now new fast phenotyping facilities that can push six generations a year. My guess is it Shiras was a result of where it was bred at least from the parchment perspective - if you breed and select something in a cold environment and then transport it somewhere where it hits 35-40'C in spring without good field trials you have no idea how it will react. The taste I thought was just ok in late winter, but not on the spectrum of Sugar Snap which is what I tend to use as a taste reference.
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