Eat This Podcast

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August 15th is Ferragosto, a big-time holiday in Italy that harks back to the Emperor Augustus and represents a well-earned rest after the harvest. It is also the Feast Day of the Assumption, the day on which, Catholics believe, the Virgin Mary was taken, body and soul, into heaven.

Is there a connection between them? And what does it have do with wheat?

Apologies to listeners in the southern hemisphere; this may not reflect your experience.

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It has been a long time since anyone who wanted to eat bread had to first grind their wheat. Grinding, however, was absolutely fundamental to agricultural societies, and still is for some. Archaeologists can see how the work left its mark on the skeletons of the women who ground the corn in the valley of the Euphrates. Then, about 2500 years ago, in the area now called Catalonia, an unknown genius invented the first labour-saving device.

Photo from the Mills Archive.

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It’s a good thing the Egyptians believed strongly in an afterlife and wanted to make sure their dead had an ample supply of bread. The bread and the tomb inscriptions tell us something about how grain was grown and bread baked. To really understand the process, however, you need to be a practical-minded archaeologist like Delwen Samuel, who first set out to replicate Egyptian bread.

Photo of a model from the tomb of Meketre, Metropolitan Musdeum of Art, Rogers Fund and Edward S. Harkness Gift, 1920.

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That kernel of wheat isn’t actually a seed or a berry, at least not to a botanist. I have no intention of getting into the whole pointless is it a fruit or a vegetable debate, so lets just agree that no matter what you call it, the wheat thing is made up of three major parts: bran, endosperm and germ. In this episode, a little about each of those parts and what they do for wheat.

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Wheat has a hugely diverse genetic background, being made up of three different species, and genetic diversity is what allows breeders to find the traits they need to produce wheats that can cope with changing conditions. But because the accidents that created wheat might have happened just the once, plenty of diversity that is missing from modern wheats is still in wheat’s ancestors. Trouble is, crossing a wild wheat with a modern wheat is almost impossible. Solution: remake modern wheat.

Photo shows a commercial variety, wilted and collapsing, while behind it a synthetic derivative copes just fine with the drought. By Maarten van Ginkel, who headed the Bread Wheat Program at CIMMYT. Thanks Maarten.