Category: Breeding

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Getting curators to think like breeders

The presentation on genomics and fruit genebanks Cameron Peace gave at the recent PAG symposium deserved more than the nibble we gave it. Dr Peace, who is an assistant professor in tree fruit genetics at Washington State University, is advocating nothing less than a complete change in the mindset of genebank curators. Here’s how he characterizes the current system:

Notice the mere trickle of material from the genebank to the user. All too true. I would say that there is also much less movement of material from wild populations to genebanks than is suggested by the diagram. But that’s at least partially down to the fundamental fact that flow of material to breeders is fairly limited. No demand, no supply. This, in contrast, is what Dr Peace wants to see:

He wants genebanks to get their skates on and, to mix a metaphor, not wait for the breeders to pull. He wants them to push. He wants them to provide performance information, and not just data on morphological descriptors; performance-predictive DNA information, and not just genetic diversity data; segregating descendant populations, and not just landraces or wild populations.

In essence, Dr Peace wants genebank curators to think like breeders. More, he wants them to be breeders. Or at least pre-breeders.

There’s much to be said for this. The latest State of the World’s Plant Genetic Resources for Food and Agriculture (SOW2) bemoans the continuing obstacles to use of collections. Something Must Be Done, it suggests. But curators have their hands full. The same SOW2 says that they have no money. That they need more equipment. That they have regeneration backlogs. That people are telling them to conserve more neglected and underutilized plants, and more crop wild relatives. That’s when armed gangs of looters are not ransacking their facilities. Now they should be plant breeders as well? Sheesh!

Well, the fact is that with the International Treaty on PGRFA, most curators don’t have to worry about basic conservation. Not really. Not for Annex 1 crops anyway. They can choose to outsource that stuff, for example to the international centres of the CGIAR, secure in the knowledge that they can have access to the material whenever they want it.

With the ITPGRFA, curators have the space to think like breeders. But do they have the training? And will the breeders return the compliment, and think a bit like curators?

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Seed dispersal: how far is far enough?

ResearchBlogging.org This barely merits the Research Blogging tag, because all I want to do here is raise a possibility, and a tenuous one at that. I confess that I was attracted in a high-speed scan of headlines, by this one: Leaving home ain’t easy: non-local seed dispersal is only evolutionarily stable in highly unpredictable environments. ((Snyder, R. (2010). Leaving home ain’t easy: non-local seed dispersal is only evolutionarily stable in highly unpredictable environments Proceedings of the Royal Society B: Biological Sciences, 278 (1706), 739-744 DOI: 10.1098/rspb.2010.1549)) The starting point is the common armchair argument that seeds disperse for three non-exclusive reasons: to escape changes in the environment they are leaving, to avoid overcrowding (and competition with sibs?) and to find and exploit new environments before other competitors.

Robin Snyder’s mathematical model seeks to understand how far seeds need to move from their parent to be reasonably certain of encountering different growing conditions. After all, “why ‘escape in space’ only to land somewhere more or less like where they started?” The models show that in almost all cases, dispersal tends to be not far enough to get away from the “parental” conditions. Only when favourable conditions are very fleeting is it worthwhile for some seeds to leave home far behind, as a “response to environmental unpredictability”.

Why bring this up here? Because the seeds of high-performing agricultural varieties are often dispersed hundreds or thousands of kilometres from the environments in which they were deemed successful. In theory they are being sent to places with very similar growing environments. But might this actually be an argument for sending seeds far from home specifically as a strategy to enable the farmers selecting them to respond to environmental unpredictability?

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Nibbles: Vegetables training, Genebanks and genomics, Kew and CWR, AnGR ABS

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Aeroponic potato seeds in Kenya

A fascinating article on the Voice of America website tells us that Kenyan scientists, with colleagues at the International Potato Center (CIP), have developed a technique for growing potatoes plants in air (with water and nutrients) and then distributing the resulting plants to farmers, who report yield increases of 4 to 5 times. ((Yes, I know we’ve been here before, but those are the only figures I have to go on.)) The article dates back to June 2010, but CIP just shared it with its Facebook friends, and that gives me the chance to say I don’t fully understand:

Seeds are germinated in the laboratory. The seedlings are then fixed into holes cut out of Styrofoam sheets. And then after the seeds are developed further, they are harvested and distributed to farmers.

Talk about “seeds” and “germination” makes me think they’re talking about true potato seed, which has been the next big thing in potatoes for as long as I can remember. But if that were true, I would have expected the article to make more of it. And what will it do for potato diversity in Kenya? I have no idea what the market-leading cultivars are or the extent of concentration; how many varieties will the researchers make available?

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Is lack of sex really the problem for grapes?

There’s a very interesting article in the New York times reporting on a major investigation of the molecular diversity among grape cultivars.

The report is based on a big paper in PNAS, which I confess I have not had time to read carefully. That said, a few things about the NYT’s coverage confuse me. One is the whole depiction of “relatedness”.

Thus merlot is intimately related to cabernet franc, which is a parent of cabernet sauvignon, whose other parent is sauvignon blanc, the daughter of traminer, which is also a progenitor of pinot noir, a parent of chardonnay.

This web of interrelatedness is evidence that the grape has undergone very little breeding since it was first domesticated, Dr. Myles and his co-authors report in the Proceedings of the National Academy of Sciences.

So how did those varieties arise? Maybe breeding means only “deliberate crosses made by a breeder”. Are they saying that the molecular data support the breeding records? Or are actual breeding records, especially for the older and better-known varieties, too sketchy to know? There’s more too, but I’m going to have to find time to read the PNAS paper properly. Or maybe you already have, in which case, feel free to comment.