That’s the title of a talk our friend and occasional contributor Jacob van Etten will give in the National Geographic store in Madrid next week, on the 28th to be precise. If you can’t be there in person, you can follow Jacob online. And if that doesn’t work, no doubt he’ll tell us here how it all went. I just hope he explains to National Geographic the difference between a potato and an oca. In fact, why not open with that, Jacob? That’ll grab their attention.
Brainfood: Pollinators, Cattle foraging, Sweet potato-pig system, Kava quality, Pastures, Pollen flow, Agrarian reform, Genotype diversity, Cacao cropping, Outcrossing
- Contribution of pollinator-mediated crops to nutrients in the human food supply. 90% of Vitamin C for a start.
- Foraging behavior of Alberes cattle in a Mediterranean forest ecosystem. It’s a semi-feral breed in NE Spain and its foraging behaviour may well decrease the risk of fires.
- Assessing the impact of the SASA/CASREN technology interventions in the sweet potato-pig production systems in Zitong County (Sichuan, China). All well and good but in this day and age one would expect some exploration of the sustainability of the interventions.
- Proposal for a Kava Quality Standardization Code. Very much needed because poor quality was probably responsible for examples of liver toxicity in the past. This is how to avoid that in the future.
- Clipping stimulates productivity but not diversity in improved and semi-natural pastures in temperate Japan. Semi-natural pastures are more diverse than improved pastures, and can be reasonably productive. So there.
- Pollen flows within and between rice and millet fields in relation to farmer variety development in The Gambia. Depends on breeding system. Likely higher within fields than between. Still no cure for cancer.
- Land, landlords and sustainable livelihoods: The impact of agrarian reform on a coconut hacienda in the Philippines. It seems to be mainly in the mind.
- Genetic divergence is not the same as phenotypic divergence. It isn’t? I’ll alert the media.
- Scope economies and technical efficiency of cocoa agroforesty systems in Ghana. Multi-crop cocoa farms are better, in multiple ways.
- Gene flow increases fitness at the warm edge of a species’ range. Outcrossing between edge populations better for living on the edge than outcrossing within edge populations, outcrossing with a center population or selfing. For a Californian annual anyway. Interesting consequences for in situ CWR conservation, in particular in context of re-introductions. Do we worry too much about “genetic pollution”?
Quinoa phylogenetics unraveled
Our regular reader and occasional contributor Eve Emshwiller informs us that her student Brian Walsh has won the award for best student poster from the Economic Botany Section of the Botanical Society of America at Botany 2011 in St. Louis. Here’s the abstract. There’s some talk of the poster itself perhaps being made available online in due course. Fingers crossed.
Phylogeny of American Chenopodium species with focus on origins of the domesticated taxa.
The edible seeds of quinoa (Chenopodium quinoa, Amaranthaceae) have gained popularity worldwide, based on nutritional qualities and ease of growing. Most people do not know quinoa is one of four cultigens of Chenopodium domesticated in the Americas: C. quinoa and C. pallidicaule from South America, C. berlandieri ssp. nuttalliae from Mesoamerica, and the extinct C. berlandieri ssp. jonesianum recovered from archaeological sites throughout eastern North America. Despite nearly 100 years of debate researchers still do not agree on the relationship among these domesticates. Conflicting hypotheses have been proposed asserting whether cultigens were domesticated independently or represent introductions into neighboring regions. Alternative hypotheses suggest two, three, or four independent domestications of Chenopodium in the Americas, and proposed several putative wild progenitors of the cultigens. To investigate the relationships among cultigens of Chenopodium and assess potential wild progenitors, a phylogenetic framework of the genus emphasizing New World species is required. Phylogenetic analyses of DNA sequences of non-coding loci, both nuclear (SOS1 intron 17, COS at103, ITS) and plastid (trnQ-rps16, trnL-trnT, ndhJ-trnF-trnL, psbD-trnT, and psbM-ycf6), were conducted using parsimony, maximum likelihood, and Bayesian analyses. Taxon sampling includes 19 Chenopodium species from North and South America, with focus on the extant cultigens and subspecific taxa within C. berlandieri.
Findings include the following: Chenopodium pallidicaule is genetically distinct from other extant cultigens.
Sampled cultivars of the Mesoamerican cultigen, C. berlandieri ssp. nuttalliae, unite in a single subclade, nested within, but distinct from wild C. berlandieri.
Chenopodium quinoa is nested within the C. berlandieri complex, but not within the C. berlandieri ssp. nuttalliae clade. Interestingly, the southern-most range of wild C. berlandieri is southern Mexico, whereas quinoa is cultivated in Eduador, Peru, and Bolivia. These findings are consistent with independent domestications of the extant cultigens. Using nucleotide markers unique to C. berlandieri ssp. nuttalliae, ancient-DNA analyses will be conducted to determine the relationship of the extinct cultigen, C. berlandieri ssp. jonesianum.
Brainfood: Tomato erosion, Cassava starch, Landscape diversity, American chestnut, Niche models, Dormancy genes, Herbarium collections, Indian livestock breeding, Banana breeding, Pollinators, Shattering gene, Participatory research
- The risks of success in quality vegetable markets: Possible genetic erosion in Marmande tomatoes (Solanum lycopersicum L.) and consumer dissatisfaction. Market takes the fun out of landraces.
- Genetic variability of root peel thickness and its influence in extractable starch from cassava (Manihot esculenta Crantz) roots. Starch content depends on dry matter content and peel thickness. About 1500 accessions from CIAT evaluated for the latter, so lots to play around with.
- A meta-analysis of crop pest and natural enemy response to landscape complexity. More landscape complexity means more natural enemies. Still no cure for cancer.
- American Chestnut past and future: Implications of restoration for resource pulses and consumer populations of eastern U.S. forests. Reintroduction of blight-resistant chestnut may have some weird effects on other species.
- Keep collecting: accurate species distribution modelling requires more collections than previously thought. Oh damn.
- Variation in seed dormancy quantitative trait loci in Arabidopsis thaliana originating from one site. Is due to two QTLs. Also flowering time. But no, I don’t understand that “In contrast…” at the end of the abstract either.
- Tracking origins of invasive herbivores through herbaria and archival DNA: the case of the horse-chestnut leaf miner. Another use for old herbarium specimens: finding evidence of pests.
- Animal breeding in India – a time for reflection, and action. The reflection is that genetic improvement has stagnated, so the action needed includes better phenotypic record keeping, more attention to local diversity and community-breeding programmes.
- Performance of micropropagation-induced off-type of East African highland banana (Musa AAA – East Africa). A promising avenue for improvement, the off-types yield more better bananas, a month later.
- Pollination services in the UK: How important are honeybees? Not as important as you might think!
- The same regulatory point mutation changed seed-dispersal structures in evolution and domestication. Cabbage-family fruit development and rice shattering share the same single point mutation.
- Participatory research and on-farm management of agricultural biodiversity in Europe. By Michel “Pimpert”. That should be Pimbert. Old news, but worth mentioning.
Diverse seeds for disaster relief
SciDev.net reports on a new study reinforcing the view that after a disaster that wipes out seed stocks the local, informal seed system “in the form of loans or gifts of seed from friends and relatives” is more likely to restore agrobiodiversity to the farming systems than seed relief and markets. The study looked specifically at cowpea (Vigna unguiculata) after disastrous floods in Gaza Province, Mozambique, and strengthens the more general conclusion that seeds already in the local system offer the best chance of restoration.
I can’t help wondering, however, whether disasters of this kind might not also offer an opportunity to inject extra diversity into farming systems. Not just any old diversity, as might be provided by seed relief or generous private sector suppliers, but diversity selected to perform well under predicted climatic conditions in the disaster area. A savvy genebank system, working with relief agencies, might be able to supply small amounts of pre-selected diversity that farmers would be willing to try under the circumstances. And some of that diversity might even be better than what they had before the disaster.
Just a thought.