Category: Fruits and nuts

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Old maps used to track down hops in Sweden

ResearchBlogging.orgI’ve done a fair amount of reading and thinking about the theory and practice of germplasm collecting in my time, but I don’t think I’ve ever come across an example similar to the one described in a recent paper in Genetic Resources and Crop Evolution. ((Strese, E., Karsvall, O., & Tollin, C. (2009). Inventory methods for finding historically cultivated hop (Humulus lupulus L.) in Sweden. Genetic Resources and Crop Evolution. DOI: 10.1007/s10722-009-9464-9.))

In it, Swedish researchers describe how they took advantage of a couple of interesting quirks in the history of Sweden to devise what I think is a pretty novel strategy for sampling agrobiodiversity. They were interested in collecting germplasm of hops (Humulus lupulus) for a new genebank that’s under development. Now, the thing is that, although this crop is no longer grown in Sweden now, for 400 years from 1442 doing so was compulsory, in order to guarantee sufficient domestic production for beer-making. Very sensible, too.

Initially, all peasants were required to grow at least 40 hop poles. By 1483, the quantity was increased to 200 hop poles. The law was not formally repealed until 1860. As a result of this law, the plant has left several financial, fiscal and legal imprints on Swedish history.

The second historical curiosity about Sweden is that it boasts a unique set of some 12,000 large-scale maps dating back to the mid-17th century. Because of the hops law, hop gardens are actually marked on these maps in some detail (click to enlarge).

hops

So the collectors used what they call a “history to plant” method to identify likely areas for collecting, using not only maps such as the one reproduced above, but also…

…medieval charters from the fifteenth century files of land belonging to the abbey of Vadstena, documents from the expeditions of Carl von Linné and his pupils from the eighteenth century and also documents from the breeding program in Svalöf from the beginning of the twentieth century.

And a pretty successful strategy it was too.

We found no hop plants at locations which were not indicated in the maps as hop gardens. Today living plants were possible to find in more then 33% of the total inventoried sites, indicated as hop gardens on large-scale maps.

As I say, I can’t think of another example of the use of historical maps to locate specific crops for sampling. No doubt the specific circumstances that made this possible in Sweden are not all that common around the world. Anyway, if you know of similar work, let me know. Always interested in keeping up to date with the latest in germplasm collecting.

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Nibbles: Dogs squared, Afghanistan’s poppies, Rice at IRRI, Book on sapodilla chicle in Mexico, Opuntia, Trees

  • DNA survey of African village dogs reveals as much diversity as in East Asian village dogs, undermines current ideas about where domestication took place.
  • Fossil doubles age of dog domestication.
  • “When children felt like buying candy, they ran into their father’s fields and returned with a few grams of opium folded inside a leaf.”
  • “The rice, a traditional variety called kintoman, came from my grandfather’s farm. It had an inviting aroma, tasty, puffy and sweet. Unfortunately, it is rarely planted today.”
  • “An era of synthetic gums ushered in the near death of their profession, and there are only a handful of men that still make a living by passing their days in the jungle collecting chicle latex…The generational changes in this boom-and-bust lifestyle reflect a pattern that has occurred with numerous extractive economies…”
  • Morocco markets prickly pear cactus products.
  • TreeAid says that sustainable agriculture depends on, well, trees.
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Traditional tattoo dye to go mainstream

The report in FoodNavigator seemed pretty boring at first sight:

EcoFlora has developed a natural, acid-stable blue coloring for foods, beverages and cosmetics and it says the creation of a sustainable supply chain differentiates it from other colors on the market.

But then I googled the plant involved (“edible jagua fruit, which grows in the Chocó rainforest” of Colombia). It turns out jagua is Genipa americana, which is cultivated for its edible fruit, but also has other traditional uses.

South American Indians bathe their legs in the clear liquid obtained from the fruit. The liquid has an astringent effect. When the liquid oxidizes, it stains the skin black. These stains are permanent, but only color the top few layers of skin, and thus disappear after about a fortnight, when the skin is naturally shed. As South Americans Indians went into battle, they used to paint themselves with Genipa juice and annatto.

The active compound is called genipin. Apparently, there’s been a “recent explosion in the popularity of Jagua body art.”

There’s nothing in the FoodNavigator piece about where the idea for this “natural, acid-stable blue coloring for foods, beverages and cosmetics” ultimately came from. However…

EcoFlora says it is committed to working with some of the poorest communities in the region to harvest the fruit in a manner which is environmentally sustainable and beneficial to the local economy.

Well, that’s something, I suppose.

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Cherries come and go

The FreshPlaza newsletter is a veritable treasure trove of information on fruit & veg around the world. Yesterday’s issue was particularly rich in agrobiodiversity articles. Among other things, it pointed to pieces about how the British are losing their cherry varieties, and about how a Washington State farmer found a new one. There was also an appreciation from Pakistan of the local fruit known as “jamun“, which is probably Syzygium cumini.