A juicy tomato story

Jeremy’s latest newsletter has a useful snippet on a paper on the history of the tomato in Europe. I’ll reproduce it below as a taster, but consider subscribing, as there’s lots of other interesting stuff too, on everything from pizza to chocolate.

Maybe you saw those beautiful illustrations of 16th century tomatoes that were doing the rounds a few days ago. They were prompted by a lovely paper from the Netherlands looking at the earliest tomatoes in Europe. The paper may be a bit heavy going, but the researchers published their own summary for the rest of us.

The paper sheds light on those first tomatoes to arrive, and in particular on the notion that these first fruits “were elongated, segmented, and gold in color. After all, that is how they were depicted, and they were called ‘pomo d’oro’: golden apple.” Herbarium specimens and old drawings, many of them newly digitised, revealed many different colours, shapes, and sizes, but not whether tomatoes originated in Peru or Mexico, the two leading candidates. The Dutch researchers sequenced the highly degraded DNA of their specimen and say that it was definitely not a wild plant, and shows strong similarities with three Mexican varieties and two from Peru.

The indigenous Andes population in Peru started domesticating a small wild cherry tomato. They brought this to Mexico, and there they developed the tomato with large fruit that we know today.

No herbarium specimen is ever likely to germinate, so to find out how these first tomatoes in Europe might have tasted the best bet, they suggest, is to go to Mexico and Peru. DNA analysis could probably indicate the closest known relatives for a taste test.

Now, will someone please examine critically the whole “tomatoes didn’t catch on because they were considered poisonous” thing, or is there already enough proof of that?

Brainfood: Genebanks, Covid, Sustainable intensification, Anthropocene, Biodiversity value, Cropland expansion, Better diet, Biodiversity indicators, Climate change impact, Soil fertility, Agroecology & GMOs

What have genebanks ever done for us?

Dr Helen Anne Curry, an historian at the University of Cambridge, has a piece out to trail her much anticipated book, Endangered Maize.

I haven’t read the book yet, but the article is a brisk, knowledgeable and engaging run-through the history of crop diversity conservation in genebanks, using maize as a case study. Her conclusion is stark.

I’m sceptical that seed banks – still conceived today as the central element in successful conservation of genetic diversity in crop plants – offer the long-term solution we need.

But is this fair? I don’t think anyone who is serious about the conservation of crop diversity really thinks genebanks are “the” solution, or indeed even “central” to the effort. We’ve been talking about complementarity between ex situ and in situ conservation for decades now. Genebanks are a piece of a complex puzzle: an important piece — and important in different ways and to different extents for different crops — but just a piece.

Dr Curry is similarly skeptical about genetic erosion:

…[o]ne especially disruptive piece of evidence was the discovery that, in some places, farmers didn’t change over to newly introduced “high yielding” crop varieties, even when they had an opportunity to do so. Or that when farmers did adopt new seed, they also kept continued growing the older types, too. As a result, varieties slated for inevitable extinction in the 1950s hadn’t disappeared.

But again, we’ve known for a while that the reality of genetic erosion is not as straightforward as the all-too-common “75%” narrative. Though admittedly it has taken us way too long to put that in writing.

In any case, it’s great to see the work of genebanks analyzed from a new perspective, or at least one that we’re not particularly used to. There’s always something to learn.

The business of conservation

With the commercialization initiatives I’ve described here, there are now excellent opportunities to ensure the long-term survival of ‘heirloom’ varieties in the systems where they originated.

And that’s from a genebanker, Dr Mike Jackson! His recent blog post about his “conversion” is long, but well worth reading in full.

You might want to follow that up in a couple of days with ‘Is there a business case for forgotten crops?’, the next online event in the Forgotten Crops Society Dialogue Series. The topic will be discussed by Natasha Santos, Crop Science Division Vice President, Head of Global Stakeholder Affairs & Strategy Partnerships at Bayer AG. Another conversion?

Brainfood: Transformation, Diet diversity, Millets, European wheat, European phenotyping, Maize NDVI, Brazil soybean, Wild wheat quality, Macadamia genome, Domestication, Cacao genebanks, Camelina, W African cooking