Author: Jeremy Cherfas

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African Agroecological Alternatives to the Green Revolution

We will strongly oppose and fight against such policies and practices promoted as “a new green revolution for Africa”.. Instead of solving the main problems for Africa, the Green Revolution will exacerbate current problems and create new problems in the long run. Their policy is environmental unsustainable, and will create more hunger and poverty.

Fighting talk from the 150 people who gathered for a series of conferences at the Nyéléni centre in Selengue, Mali, between 26 November and 2 December. Read the rest of the outcome statement here, and the conference documents here.

Will it make a hill of beans’ worth of difference? Depends, but one cannot help agreeing with the conference participants’ own conclusion:

We agreed that the real test of the significance of our week at the Nyéléni centre will be what we are doing in practice in the next weeks, months and years.

Indeed. And on the support they receive, no doubt.

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Seed conservation: cold, or dry?

Another fine guest post from Jacob van Etten.

Places with extreme conditions are good for conservation, whether it be Timbuktu with its dry, hot climate for books or Spitsbergen with its freezing cold for crop seeds. Next year the seeds will start to come to Spitsbergen from across the world to stock the “doomsday seed vault”. Right now the vault is being cooled down, to be reaching -18°C soon.

Low temperatures are key to ex situ conservation of seeds. Cold chambers and freezers stuffed with seeds are found near any plant scientist around the world. The Svalbard project is not only unique because of the size of the vault but also because of its location. The low temperatures on the island will make the vault less expensive to cool as well as less vulnerable to energy failure, a common preoccupation of seed bank managers in those countries where tropical temperatures, unreliable energy networks and unpaid bills tend to converge. An alternative solution, however, seems to be on the horizon. The latest Technology Quarterly section of The Economist runs an interesting story about dry storage of biological materials at room temperature. Wrapped in polymers or sugars, DNA molecules are less vulnerable to degeneration. Perhaps this technology will also be available to seeds some day?

Continue reading “Seed conservation: cold, or dry?”

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Three into one for new wheat

Scientists at the Australian CSIRO and Sydney University, working with colleagues at CIMMYT in Mexico, have built a chromosome that brings together the disease resistance genes of two wild wheat species into a single genetic package. ((L. Ayala-Navarrete, H. S. Bariana, R. P. Singh, J. M. Gibson, A. A. Mechanicos and P. J. Larkin (2007) Trigenomic chromosomes by recombination of Thinopyrum intermedium and Th. ponticum translocations in wheat. Theoretical and Applied Genetics, 116: 63-75.)) This should make life easier for wheat breeders; while they may be able to find valuable genes in wheat’s wild relatives, those genes are often accompanied by large blocks of other genes that often bring bad qualities. Getting the harmful genes out of the cross is apparently sometimes so difficult that breeders give up.

Thinopyrum intermedium (intermediate wheatgrass) contributed resistance to barley dwarf yellow virus, while Th. ponticum (tall wheatgrass) supplied a couple of rust resistance genes. They are both on the short arm of one of the wheat chromosomes, but without the baggage normally associated with genes from wild relatives. Crosses with bread wheats resulted in fertile offspring with the required resistance. These are being used to study the genes further in search of molecular markers that will help breeders to identify valuable crosses.

According to a press release:

By developing new DNA markers and by careful testing the team has produced a number of the disease resistance packages for wheat breeders, making it faster and easier to include these important disease resistance traits in future wheat varieties.