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Post by Dewdrop on Dec 13, 2020 4:50:32 GMT -5
I'm curious of which crops or plant varieties that have already been bred for horizontal resistance. I'm also wondering if any of them might be available to the public to purchase. I may have been doing some re-reading on sharebooks.com regarding horizontal resistance breeding.  |
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Post by xdrix on Dec 13, 2020 13:21:47 GMT -5
If i have understand its a transfer of genes of differents species?
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Post by Dewdrop on Dec 23, 2020 4:35:15 GMT -5
I don't know if it can be done with different species, but it can definitely be done within a single species. Based off the reading, my guess is that one could be done with any plants that can be hybridized. It sounds like it's through pollination, therefore breeding. The pdf/book(s) on horizontal resistance breeding includes population breeding and re-current mass selection. It sounds like you attempt to start with a wide genetic base, you expose the individuals to one introduced problem at a time, ensure a few plants survive and reproduce, and select to increase a quantitative resistance to pests or diseases. (Edited) It says it is suited to an agro-ecosystem, which I'm guessing is a downside for global seed companies. sharebooks.com/system/files/Plant-Breeders-Handbook.pdf You can look up the term Horizontal Resistance in this online pdf, the Amateur Plant Breeder's Handbook by Raoul Robinson. |
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Post by imgrimmer on Dec 23, 2020 10:43:30 GMT -5
Sounds like landrace breeding. Like e.g. Joseph Lofthouse is doing it.
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Post by xdrix on Dec 23, 2020 11:04:01 GMT -5
For exemple i did it with the squash breeding and it is very easy.If i have not the time i know that the bees can did the work for me.
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Post by Dewdrop on Jan 10, 2021 20:15:14 GMT -5
Thank-you, I didn't think to compare it with landrace breeding.
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Post by walt on Mar 26, 2021 14:06:50 GMT -5
One crop where horizontal resistance is used is Medicago sativa, called Alfalfa in USA and Lucern in UK and some other countries.
this crop is a perennial hay crop, and studies have shown that yield is directly related to disease and insect resistance.
So Dr. Sorenson at KSU was intercrossing some alfalfa clones and germination the seeds in a pie plate of vermiculite. As soon as the sprouted, the seedlings were sprayed with a suspencion of spores of some pathogen, then another, and another. The alfalfa weavils were turned loose on them, then some kind of aphids.
Naturally, at each step of this the number of survivers dropped. Then any seedlings that were left were planted in a vat of wet soil he had been using for years and contained all kinds of root rot germs.
Finally those still alive were included in the crosses for the next generation. He been doing this for years and sometime his population would get resistant to the insects and pathogens he was working with. Then he'd trade some of his seed with another alfalfa breeder in another state, who had been doing the same thing but with another set of pathogens and insects. He'd cross his seedlings with the seedlings from the other breeder and continue.
He said about every state university had such a program.
CIMMYT in Mexico is breeding for horizontal resistant in barley, wheat, and triticale. They do it by growing these crops, from a diverse origional population, in very humid areas where many diseases are rampant.
I'm sure there are other examples I can't recall just now. Even so, I think it should be used more than it is.
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