Wheat needs more research. It is the most nutrient-rich of the world's cereals and the most widely planted crop. It is also the staple most vulnerable to climate change. A few thousand commercial species are carefully grown and preserved. But hundreds of thousands of older varieties and wild relatives are left to the vagaries of land-use change, global warming and chance. This is a worry because some of the most desirable characteristics of plants-taste, drought- and pest-resistance-originally came from the wild gene pool, which will be needed again one day.

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