The diverse uses of genebank collections

It’s easy to assume that it’s only plant breeders that use genebank collections. But in fact there are clever people out there who are delving into genebanks for all kinds of different reasons. Two recent articles on rice illustrate this nicely.

In the latest Rice Today Tom Hargrove tells the story of the global odyssey of the rice varieties called Carolina Gold and White.

Carolina Gold and White show how genes of good crop varieties spread. The seeds made a remarkable journey: from Indonesia to Madagascar by boat almost 2,000 years ago, then to the wealthy and slave-driven Carolina plantations. Her seeds seem to have helped war-weary Confederate veterans start a new life along the Amazon in South America. Freed slaves may have taken her seeds back to Africa, which she once called home. Carolina Gold recently started a new life in South Carolina, and her white-hulled sister is a parent of an improved variety for upland rice farmers in Colombia and Panama.

Hargrove describes how it was by comparing contemporary seeds with genebank samples that part of that epic story was pieced together, and how it was from genebank samples that Carolina Gold cultivation was revived, albeit it on a much smaller scale, in the State which gave it its name, after almost a hundred years.

Meanwhile, EurekAlert has a piece on another famous, though rather more modern, rice variety: IR8. One of the Green Revolution varieties,

IR8 used to produce 9.5 to 10.5 tons per hectare, significantly more than other varieties in the 1960s when average global rice yields were around only 2 tons per hectare. But, when grown today, IR8 can yield only around 7 tons per hectare.

Why? Is it nature or nurture? Researchers “grew rice from original IR8 seeds preserved in the International Rice Genebank and compared it to rice grown from IR8 seeds continuously grown and harvested over the last few decades.” Genetically, they were found to be similar, so the 15% decrease in yield must be down to environmental changes, possibly including hotter nights:

the findings demonstrate the need for ongoing or “maintenance” breeding because it allows rice plants to cope with a changing environment.

So, even when genebank accessions are not used by breeders, the results can end up being of use to breeders.

Farming relicts in peril in Georgia

From our friend and colleague David comes news of a paper on erosion of crop genetic resources in Georgia. The one in the Caucasus, not the southern US. Anyway, good to be reminded that it’s not just species that are in trouble, but also crop varieties.

There are some nice B&W photos in the article, including this one of a threshing board, which reminded me of one of our earliest posts.

The bottom line?

…in Georgia the main reason for genetic erosion of ancient crop varieties is demographic decline in mountain regions due to harsh economic conditions and lack of modern infrastructure.

Wait. So if there were more people in the mountains, and better roads, there would be more landraces? All those people wouldn’t be growing modern varieties and trucking the harvest to markets in the cities?

Pavlovsk: you are here

Chaffey’s regular words of wisdom on anything botanical. Well, mostly wise. But more on that later…

That’s from a nibble a few days ago. The qualification concerned Pavlovsk, and Jeremy has now set the record straight. Incidentally, the latest update on the situation from the Vavilov Institute itself has the first decent map of Pavlovsk I’ve seen. Here it is. Explore for yourself: no Street View, alas.

Map of the Pavlovsk Research Station. Yellow: border of the station; Red: border of disputed plots; Green: border of the fruit and berry collection.

Nibbles: Pavlovsk, Baobab hybridization, Jackfruit, Vavilovia, Cowpea education, Lead, Bees, Banana wilt, Dariy cows, Pavlovsk, Drylands, School gardens, Genetic diversity in botanic gardens

  • The value of Pavlovsk. Jeremy delivers a slap.
  • CIRAD on kinky sex among the baobabs.
  • “I had never heard that there were distinct varieties of the jackfruit, although of course such a thing was reasonable, so I naturally wanted very much to taste one.” Naturally.
  • Wild relative of pea gets a weird hybrid in-ex situ conservation treatment.
  • A Cowpea Story, an illustrative children’s book by Vicky Inniss-Palmer, tells the hopeful story of a cowpea named Catalina and her struggle to overcome illness and disease with the help of scientists. Meanwhile, scientists meet.
  • Urban gardeners, beware lead. And nurture your pollinators.
  • Reading this, anyone would think nobody had ever researched banana Xanthomonas wilt.
  • Improved dairying in Kenya.
  • Vavilov Institute’s comprehensive update on Pavlovsk.
  • ICRISAT to put in place new market-oriented strategy which will use a “systems perspective in setting our priorities to ensure that all important issues along the dryland agriculture value chain are addressed.”
  • Meanwhile, ASARECA asks for ideas on how to intensify one of those dryland systems in the face of climate change.
  • ICIMOD promotes herbal gardens in schools.
  • Botanic gardens get wrists slapped over their inattention to genetics.

Brassica bounty

Couldn’t resist today’s trifecta of Brassica papers. At the meta level, there’s “Origin and Domestication of Cole Crops (Brassica oleracea L.): Linguistic and Literary Considerations” in Economic Botany. Then some of the same authors follow up in GRACE with “AFLP analysis of genetic diversity in leafy kale (Brassica oleracea L. convar. acephala (DC.) Alef.) landraces, cultivars and wild populations in Europe.” And finally, in Plant Breeding, enjoy “The cytoplasm effect comparison between Brassica napus and Brassica carinata on floral characteristics of Brassica oleracea.” Enough to keep brassica boffins busy for weeks.