Category: Genetic erosion

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Cassava in Africa

Cassava has a big problem in Africa, and it is called brown streak virus. A virulent strain is spreading rapidly across eastern and southern Africa from a beachhead in Zanzibar, devastating the tubers but leaving the leaves looking healthy, which means farmers don’t realize anything is wrong until it is too late. Scientists from the International Institute for Tropical Agriculture (IITA) have been studying the virus and have developed resistant varieties, by conventional breeding, and these are finding their way to farmers.

There’s a short SciDev piece about brown streak virus which points to a longer, very readable New Scientist article. I know we’re talking about a very serious problem and a very nice solution based on the exploitation of agricultural biodiversity, but normally I wouldn’t blog about this sort of thing, simply because there are so many similar examples out there. But I was inspired to do so on this occasion because I also spotted an article in a Ugandan newspaper (via the wonderful allAfrica.com) which talks about the resistant varieties and efforts to get sufficient planting material of these cultivars into the hands of farmers in a particular district. It’s always nice to see “big” stories from international news sources reflected in the local media.

Cassava is an important constituent of Kinshasa’s urban gardens, whose role in providing nutrition, especially to children, is so well described in a Christian Science Monitor article today. Let’s hope brown streak virus doesn’t reach Kinshasa, but if it does the resistant varieties would find a ready means of dissemination through a project which “organized a team of local volunteers called “Mama Bongisa” (‘mom improver’) to teach mothers in some … impoverished neighborhoods about nutrition and farming.”

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Durum wheat erosion

If there’s a dominant meta-narrative in agricultural biodiversity circles it is that modern breeding programmes relentlessly decrease the genetic diversity of crops, increasing yields and quality but also, as new varieties displace landraces and older varieties in farmers’ fields, depleting the very resource on which they are dependent for continued success. But actually there’s not really that much in the way of hard figures on this process. So a recent paper on what breeding has done to diversity in Italian durum wheat is very much to be welcomed.

The researchers used molecular and biochemical markers to compare genetic diversity among five different groups of durum varieties, ranging from landraces from before 1915, to pure lines derived from landraces in the 30s, to genotypes selected from crosses between local material and CIMMYT lines in the 70s. In general, there was indeed a narrowing of the genetic diversity within these groups over time. In fact, the degree of narrowing was probably underestimated, because only a relatively few of the pre-1915 landraces were still available for analysis. Conserving what is left is all the more important.

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Wikiseedia: what is it?

Seedpod There’s a long and detailed message from the folks at WorldChanging about something they call SeedPOD. It isn’t clear exactly what this resource will be. A sort of information exchange, but also a network for exchanging seeds and maybe too a platform for sharing experiments and results in more sustainable agriculture. As they describe it:

an imagined toolkit to keep seeds moving, farmers thriving and communities fed in the face of massive environmental change. Perhaps it will trigger some interesting thinking out there: at very least, we hope you find it briefly diverting.

All this seems to be organized through something called the Wikiseedia, but as far as I can see there is no link to this fabulous beast. Go to www.wikiseedia.com, however, and you see a bare bones installation of a wiki (a special kind of web site that anyone can contribute to and edit) that contains no content (yet?) and that has not been changed since 5 March 2007. WorldChanging’s post is dated 27 April.

There’s something happening out there. What it is ain’t exactly clear. But it will bear watching. At least, I hope it will, because it sounds really exciting.

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Perk up people, it’s about your survival

Someone called Bradford Plumer, whom I had not previously come across, has a longish post asking why people don’t seem to care about the ongoing mass extinction and wishing that more writers on the subject “would really hammer home why humans should care about the loss of biodiversity”. Funnily enough, he couches his entire argument in terms of natural processes and ecosystems and what their collapse might mean. And he quotes agriculture, and especially monoculture, exclusively as problem, not solution. But the only example he gives of the sort of example that might might “get people to perk up” is the possibly looming pollination crisis caused by a shortage of bees.

Until there is a wider understanding that agriculture is part of nature, and not separate from it, and that we humans are far more dependent on the food providing services of agriculture than on any other ecological service, I doubt that there’s going to be much perking up anywhere.

There’s not a lot of understanding of that in Brad’s posts or the comments on it, but I live in hope.

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Welsh pony in trouble?

A long article in icWales, the self-described “national website of Wales,” details the predicament of the local pony breed. Once an important part of everyday rural life – and indeed industrial life, due to their use in coal mines – more recently a children’s trekking pony, there is now limited demand for the breed. Wild herds have thus declined dramatically, no doubt resulting in genetic erosion. Does it matter? A resounding yes echoes around the hills.