- USDA goes hunting for long-lost heirloom collard greens: Indiana Jones unavailable for comment.
- USDA leader of genetic resources explains why genebanks matter: Indiana Jones laps it up.
Plants and health
Yes, yet another thematic trifecta. I swear I don’t go out looking for these, they just pop up every once in a while. CABI’s excellent blog had a piece today about CABI’s own fungal genetic resources collection and its value as a source of useful compounds. It includes Fleming’s original penicillin-producing strain so it does have form in that regard. Then Seeds Aside has a post on variation among olive varieties in a gene for an allergenic protein found on the pollen grain. And finally, over at the Oxford Dictionary of National Biography, a thumbnail sketch of the redoubtable Phebe Lankester, who wrote extensively on both botany and health — and occasionally on the link between the two — in the latter part of the 19th century. ((Ann B. Shteir. (2004) “Lankester, Phebe (1825–1900).” Oxford Dictionary of National Biography, Oxford University Press. [http://www.oxforddnb.com/view/article/58526, accessed 10 April 2008].))
Meta-analyzing diversity
If you’ve just arrived from Tangled Bank, welcome. And be aware that there’s a follow-up post.
A couple of meta-analyses on the menu today.
Devra Jarvis and Bioversity International colleagues, together with numerous co-authors from national programmes around the world, have a paper in PNAS summarizing the results of a 10-year effort to establish the scientific bases of on-farm conservation of agrobiodiversity. ((Jarvis, D.I., Brown, A.H., Cuong, P.H., Collado-Panduro, L., Latournerie-Moreno, L., Gyawali, S., Tanto, T., Sawadogo, M., Mar, I., Sadiki, M., Hue, N.T., Arias-Reyes, L., Balma, D., Bajracharya, J., Castillo, F., Rijal, D., Belqadi, L., Rana, R., Saidi, S., Ouedraogo, J., Zangre, R., Rhrib, K., Chavez, J.L., Schoen, D., Sthapit, B., Santis, P.D., Fadda, C., Hodgkin, T. (2008). A global perspective of the richness and evenness of traditional crop-variety diversity maintained by farming communities. Proceedings of the National Academy of Sciences DOI: 10.1073/pnas.0800607105))
Varietal diversity ((The unit of analysis was the farmer-recognized and named variety.)) data on 27 crops grown on 64,000 ha by 2,041 households in 26 communities in 8 countries on 5 continents were pulled together in a stunning feat of synthesis. Are any generalizations possible from such a massive dataset? Well, perhaps surprisingly, yes. Let me pick out the highlights:
- Households growing traditional varieties generally grow more than one (1.38-4.25).
- Households within a community tend to grow somewhat different sets of traditional varieties.
- Larger fields generally have more traditional varieties, but smaller fields tend to be more different in varietal composition.
There’s much more to this rich analysis than that, but the take-home message can be pretty easily stated: crop genetic diversity can still be found on-farm because even neighbouring families choose to grow different traditional varieties, and generally more than one. Especially families tending smaller fields, who will presumably be poorer and living in more marginal conditions. The conoscenti will recognize a familiar meta-narrative, but it is good to have solid data from a wide range of crops and from all over the world.
The next paper I want to talk about looked at genetic diversity in wild clonal species as it relates to their breeding system. ((Honnay, O., Jacquemyn, H. (2008). A meta-analysis of the relation between mating system, growth form and genotypic diversity in clonal plant species. Evolutionary Ecology, 22(3), 299-312. DOI: 10.1007/s10682-007-9202-8))
Summarizing 72 genetic diversity studies, including of a couple of crop relatives, the authors found that populations of self-incompatible clonal species tended to have fewer genotypes, more unequally distributed (i.e., with a few dominant clones), than populations of self-compatible clonal species. It would be interesting to see if this relationship is also present in vegetatively propagated crops. I don’t think the previous dataset would help with that, however. Only two clonal crops were included in the on-farm analysis, cassava and taro. Interestingly, they had the highest average levels of community-level varietal richness (33) compared to seed-propagated species.
Nibbles: cats, pulses, cherries
- The World Cat Congress is on. Hipsters hanging out, smoking dope, listening to jazz, I imagine. Very select, though.
- Canadian boffins evaluate nutritional differences among pulse cultivars. Regular readers recognize leitmotif.
- Celebrity chefs try to save British cherry orchards. Madame Ranevskaya happy to hear it.
More spud news than anyone needs
Today’s crop of heartwarming potato stories come to you from Peru, the Philippines and India. First, Living in Peru has a fluff piece about how Peruvians are not eating enough potatoes, and that something must be done about it. It also says that “Peru has 2,800 of the 3,900 varieties of potatoes that exist in the world today.” I have no idea where they got those figures, whether they are close to the truth, or whether we even know the truth. But I’ll try to dig a little deeper and report back.
Then comes the Philippines Information Authority with news that a new potato variety is to be released in that country, bearing the name of the president. How sweet. The article says that the “original planting material was sourced” from the International Potato Centre (CIP), and previously had the codename “13.1.1”. The variety is blight-resistant and high in solids, and is supposed to be good for organic conditions. Now, it would have been interesting to know a little more about 13.1.1, but some rapid checking revealed nothing. Again, I will dig further.
And finally, news from India that a local farmer’s son, who went to the US for training in plant physiology and pathology, has now come back and set up a tissue culture lab on the family farm. Now that’s what I call technology transfer. But you wonder what kind of a farmer the father is. Not your typical Indian farmer, I’ll wager.