- National Organic Coalition suggests USDA’s National Institute for Food and Agriculture separate conventional and participatory breeding from anything involving DNA in considering projects for support.
- Second-guessing the Three Wise Men.
- Yet more on attempts to deconstruct ancient Roman medicines using DNA from tablets found in a shipwreck. Real Indiana Jones stuff.
- Botanic garden and genebank for drought-resistant plants to be established “in Asia’s largest wild fruit forest.” That would be in China. I really don’t know what to make of this. Really need to find out more. But why am I talking to myself?
- Brown (rice) is beautiful.
- Feedback from a genebank user. Kinda.
- Rooibos gets itself certified.
- The oldest cultivated tree on record.
- The taste of Massachusetts.
- “…strongly conservation-minded botanic gardens appear to be in the minority.” Easy, tiger. Will that new one in China (see above) feature in this minority?
- ILRI on an Aussie TV program on conserving local livestock breeds in Africa.
Nibbles: Cuba, India, Kansas, Amazonia, Rice, Fonio, Rare breed
- A Cuban tells us what he thinks is wrong with Cuban agriculture.
- Rahul Goswami has two long, thoughtful articles, on how India’s next five year plan is not realistic about either food or urbanisation.
- And what’s worse in the US today, drought, or heat? Do we have to choose?
- Less than 1% of Amazonia is made of Terra Preta. Is that enough? I dunno, how about you?
- Wanna buy some rice? I wonder if African rice, heirlooms and endophytes will get a look-in.
- Better bread from minor African grains. Digitaria, that is.
- Dairy Shorthorn in trouble in the UK.
Nibbles: Food Deserts, Garlics, Communication, Bee breeding, Millets, Sweet potatoes, Visualizing herbaria, Medieval beer
- The Economist discovers food deserts. Money quote: “some Americans simply do not care to eat a balanced diet, while others, increasingly, cannot afford to”.
- William Woys Weaver on garlics, and America, and garlic in America.
- Agricultural Communication for Development conference. Sure. But 12 days long?
- Breeding a better bee. And why not?
- Kenya Agricultural research Institute to release three new high-yielding finger millets.
- Too many sweet potato seedlings. What’s a poor breeder to do?
- A visual history of California botanizing.
- Ah, to have lived at a time when a man got most of his calories from beer! No, wait…
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.
Even heirloom tomatoes may not be what they seem
Oh, pesky scientists! A bunch of them in Spain has taken a close look at one of the darlings of European tomato culture and found it, how shall we say, disappointing. ((Joan Casals, Laura Pascual, Joaquín Cañizares, Jaime Cebolla-Cornejo, Francesc Casañas, & Fernando Nuez (2011). The risks of success in quality vegetable markets: Possible genetic erosion in Marmande tomatoes (Solanum lycopersicum L.) and consumer dissatisfaction Scientia Horticulturae DOI: 10.1016/j.scienta.2011.06.013)) The subject of their investigation was a type of tomato known as Marmande, associated with the town of that name. There are several landraces of Marmande tomatoes, and in northeast Spain two of them, Montserrat and Pera Girona, are grown in adjacent areas. Each has its favoured consumers, who argue that their Marmande is better than the others’, although both Montserrat and Pera Girona are apparently facing competition in their respective niches from upstart Marmande tomatoes from France, Italy and elsewhere in Spain.
The researchers note that:
Often without experimental confirmation, many consumers consider that everything “traditional” tastes better than improved varieties.
And they’re not going to stand for that. So, they went to growers and got samples of the two kinds of Marmande, a couple of controls from further afield, and some commercial varieties, grew them in the field and evaluated the hell out of them, including a slew of molecular tests. And here’s the bad news; while the controls and far-off Marmandes were quite distinct from one another and from Montserrat and Pera Girona on molecular data, those two could not be separated from one another, favoured consumers be damned. There were differences in the outward look of Montserrat and Pera Girona, but within each landrace the range of scores on sensory traits (what consumers are probably “preferring”) was far greater than any differences between the two.
There are differences, of course, mostly in what the two varieties look like. Montserrat has flattened fruit, while Pera Girona is pear-shaped. So, what’s going on? Farmers are clearly selecting to conform to the landrace stereotype, but not much else.
[T]he recent evolution of these tomato landraces has resulted in uniform fruit morphology and wide variation in texture, aroma, and taste. It seems farmers have selected seeds solely on the basis of fruit morphology, neglecting sensory traits. Texture, aroma, and taste do not correlate with the shape of the fruit; thus, the persistence of separate markets for these varieties is exclusively due to morphological differences in the fruit. It seems that consumers continue to identify certain morphologies with superior quality.
And this is by no means a unique phenomenon.
Selection for morphological traits while neglecting sensory traits seems to be practiced widely: variability in sensory attributes related to a genetic base has been reported in beans … and in eggplant. … In other cases, variability in sensory traits is related to cultivation practices, as in the RAF tomato, which can be acid, sweet, and crisp when cultivated in salty soils but of poor sensory value when cultivated in high yielding soils. As a result of cultivation expansion, the prestige of RAF tomatoes blossomed and wilted in a short time.
Inevitably, then, consumers are going to be disappointed by their chosen landrace at least some of the time. What’s to be done?
In order to consolidate the market, the link between organoleptic and morphological traits must be maintained and reinforced.
In other words, get back to basics: gather a group of keen consumers, identify what it is about each variety that attracts them, and then start selection to make sure that the tomatoes deliver more than appearance. As good as their word, the scientists have already done this for Pera Girona, and they say that just one round of selection has already “resulted in an improved inbred line”.
Ah, but is it still a traditional landrace?