- A way out of hell: workshop on Database Challenges in Biodiversity Informatics
- Potato man honoured.
- Farm diversity reduces nitrogen runoff.
- Darwin on the Farm, from our friends at the Global Crop Diversity Trust.
- Yeast and wheat genome sequencing going gangbusters.
- Coffee!
- Fermented tigernuts more nutritious? No, they’re not from an endangered species. Via.
- Cow water!
- Lots of medicinal plants conservation projects going on in India.
Blogging the big birthday: A taste of things to come
Tomorrow we will be celebrating the 200th birthday of Charles Darwin. Here’s a little foretaste:
Gallesio gives a curious account of the naturalisation of the Orange in Italy. During many centuries the sweet orange was propagated exclusively by grafts, and so often suffered from frosts that it required protection. After the severe frost of 1709, and more especially after that of 1763, so many trees were destroyed that seedlings from the sweet orange were raised, and, to the surprise of the inhabitants, their fruit was found to be sweet. The trees thus raised were larger, more productive, and hardier than the former kinds; and seedlings are now continually raised. Hence Gallesio concludes that much more was effected for the naturalisation of the orange in Italy by the accidental production of new kinds during a period of about sixty years, than had been effected by grafting old varieties during many ages. I may add that Risso describes some Portuguese varieties of the orange as extremely sensitive to cold, and as much tenderer than certain other varieties.
From The Variation of Animals and Plants Under Domestication (1868, p 308)
And in an astonishing display of the power of Google, Serendip, and my dodgy memory, the same Gallesio (seen above) chronicled the Citrangolo di Bizzarria, noted by Luigi almost two weeks ago.
Maize aguafiestas
From Jacob van Etten.
Uncorking a big bottle of agrobiodiversity, that is what Mexico’s first farmers did when they domesticated maize. Not only is maize enormously malleable, genetic diversity also goes everywhere through cross-pollination. That is in traditional farming systems. Modern maize improvement has been about sorting out this abundance by “freezing” it into breeding lines, to get some control over the diversity feast. But what happens when the hybrids are released into the dance room again?
An Italian study just out quantifies the gene flow from hybrids to traditional varieties. It finds different degrees of purity in the traditional varieties, but no genetic erosion. This is an interesting finding in the light of writings about “creolisation” in Mesoamerican agriculture. Creolisation, the mixing of modern and traditional varieties, is thought to lead to plants that combine their benefits. I have always wondered if the creolised varieties of Mesoamerica are not modern varieties “creolised” by selection instead of mixing with traditional varieties. Something similar to the Italian study would be needed to find this out.
The question is only one step removed from the issue of gene flow from transgenic crops to traditional varieties. Perhaps you remember the Quist and Chapela paper published in Nature in 2001 on the presence of transgenes in Mexican traditional maize, and the controversy it generated. A new study confirms the presence of transgenes in Mexico with an improved study design. Through genetic population simulations it also explains why detection of transgenes is erratic and prone to giving false negatives. The distribution of the transgenes is likely to be very skewed. A few fields will have much of them, but most will have very few. This has to be taken into account and therefore authors call for more rigorous sampling methods to detect transgene presence.
There is little discussion or speculation about the effects of transgenes on maize diversity. Will the transgenes just add to the existing diversity, like the hybrids in Italy? Will they perhaps produce some benefits, like the creolized varieties? Or will, in some Monty Python-like scenario, the big seed companies pick up the message about rigorous sampling and start to trace transgenes in Mexico in order to charge farmers for unlicensed use of their technology?
A citrus species in need of research?
It seems that citrus canker, a nasty bacterial disease, has been officially eradicated in Australia. Good news, but there is a bit of a dark lining. Along with 495,000 commercial citrus trees and 4000 residential trees, the eradication programme has included destroying a lot of trees of native Citrus glauca in the affected area. Desert Lime is well-known bush tucker, as well as a potential resource for Citrus breeding. It’s not currently considered endangered, but there’s not really all that much research about it ((That’s a bit of a casual way of introducing the fascinating Australian New Crops Web Site. Thanks to Danny for the tip.)), so that might be optimistic. There are only 8 germplasm accessions worldwide (page 29), apparently. That sounds inadequate to me. Especially given the historic proportions of the current drought, which is affecting the whole of SE Australia, including areas of C. glauca.
LATER: See also a map of the latest spate of bushfires in Australia. A threat to this and other crop wild relatives?
Nibbles: Wolf, Conservation agriculture, ODI, Food policy, Stress, Sustainability
- Evidence of extrogression from dogs. That would be the opposite of introgression, and there are apparently lots of examples from mammals.
- “Conservation agriculture is an essential element of … intensification.†Oh please.
- Simon Maxwell, director of the Overseas Development Institute, on the Millennium Villages etc. Lukewarm, I’d say.
- Louise Fresco makes bread at TED. Fiat Panis, eh?
- India to manage abiotic stresses. I’ve got a few of those I’d like to manage a bit better.
- Arab nations discuss differences of opinion on sustainability. Someone tell me the bottom line.