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Re: [SANET-MG] synthetic genes and peptides



Hi Wytze,
MAS has had good success in rice where it has been applied, mainly, to disease resistance. In these instances the QTL each contribute substantially and they are relatively few in number.QTL for yield have not yet been successfully dealt with using MAS in rice. Cucumbers pose an interesting problem, in nature they are open pollinated and depend on insects for pollination. Hybrids have been hand pollinated. Application of MAS to disease resistance, such as the virus resistance, can only be stabilized in hybrids because open pollinated varieties would segregate the QTL and dilute the resistance.
Hope this helps, sincerely,Joe Cummins
wdl wrote:
Hi Joe,
Thanks for the response. Can you tell more about MAS applications to
rice? I once talked with a representative from Keygene, a breeding
company here that applies MAS and claims to have bred virus free
cucumbers for the South African market. The way they explained it, it seemed inevitable that they had to make
hybrids otherwise the cucumber would run the risk to loose its virus
resistence again.
best
wytze








Op vr 29-07-2005, om 20:16 schreef jcummins:

Hy Wytze,
MAS has currently been most successful with hybrid maize, but rice , which is not hybrid, has had successful applications. Wheat which is self pollinated has has had less success than rice or maize. The application of MAS to wild relatives of crops could be useful in ensuring that those relatives are preserved. Regarding organic certification, it seems hard to try to exclude selections which have not been altered with synthetic transgenes but have been selected using MAS. Efforts to exclude MAS from organic certification would keep an army of lawyers employed for years! Regrading plant patents, it is hard to see how the MAS patents would differ in substance from the plant patents presently marketed. Excluding all patents from "organic" certification should be debated, however, I think that the issue is really separate from the meaning of "organic". Hope this helps, sincerely, Joe Cummins
wdl wrote:

Op do 28-07-2005, om 13:40 schreef jcummins:




Turning to marker assisted selection (MAS) I agree that it is something that organic agriculture can embrace because the crop genes are selected not altered. Nevertheless,for some important QTL R.A.Fisher will prevail leaving selection in the hands of patient breeders.
sincerely, joe cummins




Hi Joe and everyone,

This is one of the rare occasions where I disagree with you. MAS leads
inevitbly to patented hybrids and is impossible in open pollinating
systems. I doubt that that is really helpful for the development of
organic agriculture.

regards
Wytze

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