Category: Genebanks

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Revising the US Plant Hardiness Zone Map

“All gardeners are in zone denial.”

The zones in question are the U.S. Department of Agriculture’s Plant Hardiness Zones, which show where different garden species are supposed to do well. Gardeners, of course, think they know better, and will always try to push that envelope.

Anyway, the current version of the Plant Hardiness Zone Map was done way back in 1990, and needed updating. So there’s a new one coming soon. It’s bound to be different, in places very different. A whole new set of recommendations for gardeners to go into denial about.

USDA is not describing what the new map will show, but outside experts say that the trend is for zones to shift northward. “Some places have definitely warmed, although others haven’t changed at all,” says Tony Avent, owner of North Carolina-based Plant Delights Nursery and an advisor for the revision.

You can’t do much with the current map online, but the next version will be downloadable to your GIS. It will also be more sophisticated, with better data, better interpolation and better resolution (800m):

The revised map draws on 30 years of data and uses a complex algorithm to factor in other variables that affect local temperatures, such as altitude and the presence of water bodies.

Will some of the USDA’s clonal repositories (field genebanks) find themselves in the wrong zone?

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Iron-tolerant rice

SciDev.net reports on a fascinating trial set to begin in May. Researchers in West Africa have selected about 80 different rice varieties from genebanks around the world. These will be planted in iron-rich soils in four countries: Burkina Faso, Ghana, Guinea and Nigeria to see how they survive. Iron at the levels found in the trial plots would normally kill high-yielding rice varieties. The researchers will be looking for the five best varieties in each plot, and will be assisted in their search by local farmers who have agreed to participate in the variety selection. The best-performing varieties will then be given to the farmers to grow using their normal methods, to see whether they outperform traditional varieties.

An interesting aspect of the trial seems to be that the researchers are not looking for high-iron rice, which might help to address chronic anaemia. They want varieties that will yield well on high-iron soils, even if the rice itself remains iron poor. Increasing the mineral content (notably iron and zinc) of cereal crops remains an important breeding goal, complicated by the arcane relationships between soil levels, genotype, other soil chemistry and, probably, phases of the moon. There is impressive variation among accessions of wheat wild relatives and several methods have already been tried to make high-iron rice, which does actually reduce anemia. There are also traditional rice varieties that are high in iron.

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Distributed herbarium documentation

Distributed computer projects are taking off in a big way. “Many are run on a volunteer basis, and involve users donating their unused computational power to work on interesting computational problems.” That usually means looking for extraterrestrial life or working out the structure of black holes or proteins while your computer idles away. Herbaria@home is a bit different. When you sign up as a volunteer, you receive scans of herbarium sheets, you digitize the label information, and these data are then added to the herbarium’s information system. Actually, there are other examples of such projects, which use the public’s spare brain-power, as well as their spare computer-power. I wonder if this approach could be used to improve genebank documentation. Perhaps to geo-reference tricky accessions? Or how about to characterize the morphology of different varieties from photos?