Old specimen is new melon crop wild relative

ResearchBlogging.org Taxonomy is not the most glamorous of subjects. Taxonomists who venture to suggest that well-loved Latin names might be changed to reflect new knowledge are roundly denounced. Prefer Latin names over “common” names and you are considered a bit of a dork. But taxonomy matters, becuse only if we know we use the same name for the same thing do we know that we are indeed talking about one thing and not two. And that can have important consequences, not least for plant breeding.

Mueller ferdinandA new paper takes a close look at some old herbarium specimens, originally collected in 1856 by Ferdinand von Mueller. 1 Mueller was born in Germany in 1825 and went to Australia in 1845, for his health. There, in addition to being a geographer and physician, he became a prominent botanist. He collected extensively, including a long expedition to northern Australia in 1855-6. There he collected many specimens that turned out to be new to science, including two new melons that he called Cucumis jucundus and C. picrocarpus. The two of them are preserved on this herbarium sheet at Kew.

The Kew sheet K000634697 and K000634446 with the mixed collection of two species of Cucumis collected by Ferdinand von Mueller in Australia. The stem with the deeply lobed yellowish leaves and the attached fruit is the lectotype of Cucumis picrocarpus F. Muell., while the branch with the more green and much less lobed leaves is the lectotype of Cucumis jucundus F. Muell.

Fast forward 160 years or so, past a few older taxonomic revisions, and you get to one based on molecular analysis that splits the two previously recognized species of Cucumis in Asia, the Malesian region and Australia into 25 species. By this analysis Australia harbours seven species of Cucumis, five of them new to science. C. picrocarpus is one of the two previously recognized species, and the molecular analysis reveals that it is actually the closest wild relative of the cultivated melon, C. melo.

So what? Quite apart from the necessity to call things by their correct names, cultivated melons are besieged by many economically important pests and diseases. It seems likely that, as so often, resistance will come from a wild relative. Which means it is good to know exactly which plant is the closest wild relative. So what’s the status of C. picrocarpus in the wild? I have no idea, alas. I couldn’t find any entries in GBIF (possibly because they are all subsumed under C. melo) and with Luigi gone temporarily to ground I’m not sure where else to look. It seems a fair bet that it might need protection, although I’d be delighted to be wrong.

Brainfood: Genetic isolation and climate change, Not a Sicilian grape variety, Sicilian oregano, Good wine and climate, Italian landraces, Amazonian isolation, Judging livestock, Endosymbionts and CCD, Herbal barcodes, Finnish barley, Wild pigeonpea, Protected areas, Tree hybrids

How grafting a plum tree led to an obsession

Joseph Needham is known as the Man Who Put the S in Unesco. And he did indeed successfully lobby Julian Huxley for the inclusion of science in the mandate of that new-fangled UN organization. More importantly, however, he is also known for his monumental work Science and Civilization in China. Eventually stretching over 27 volumes and comprising more than three million words, Needham worked on the project for the best part of fifty years, from the Caius College, Cambridge room which is now inhabited by Stephen Hawking, as it happens. And the volumes have continued coming out after Needham’s death in 1995.

But what possessed him to set off on such a journey, a journey which would consume his whole life? Well, it’s a fascinating story, and beautifully recounted by Simon Winchester, who wrote a recent biography of Needham, in a podcast in TVO’s Big Ideas series. If you’ve got an hour spare, listen to the whole thing. If you don’t, skip to 38 minutes in, and just listen to Winchester’s description of the epiphany Needham had in 1942 in a Kunming garden, a matter of only hours into his first visit to China, after five years of obsessively studying the language back in Cambridge at the knee 2 of his remarkable Chinese biochemist mistress. Needham had an interesting, complicated private life. Anyway, he was there on a mission from the British government to report on the needs of Chinese universities during the difficult years of the Japanese occupation, when they had in effect migrated west, trying desperately to continue functioning under siege.

That epiphany has to do with agricultural biodiversity, and is the reason why I’m talking about this here. Although of course Needham’s work includes huge accounts of botany, agriculture and agroindustries, forestry, cooking and food sciences, and one of these days I’ll have to delve into them to see what they say about numbers of varieties in the past. But one thing at a time, what Needham saw in that wartime garden was an…

…old Chinese gardener in ragged blue coat and trousers with a wispy white beard who potters around smoking one of these long pipes with a tiny bowl — and a mongol cap, periodically performing elaborate grafting techniques on the plum tree. 3

Comparing that technique to what he remembered his father doing in their London SW11 garden many years before brought home to him how differently they did things in China. But there was something else. Here’s Winchester:

Perhaps the Chinese not only did their grafting differently but may have done this different kind of grafting very much earlier than anyone in Europe had done anything like it. Perhaps this old man’s technique was thousands of years old. Further still, quite possibly Needham could prove it was thousands of years old by researching old Chinese books on botany — which of course he could now read with ease.

He did research the problem of course — for fifty years. And it’s true, he did prove the antiquity of the grafting techniques that he saw. And of many other Chinese inventions too, thousands of them. That was the project of Science and Civilization in China. It changed the West’s perception of the Middle Kingdom forever, and the idea of it was born watching an old man top graft a plum tree in a Kunming garden.

There’s a coda to the story. The ashes of Joseph Needham and his two wives (both interesting characters in their own right), whom he outlived, were commingled on his death and spread under a Chinese plum tree growing in the gardens of the institute named after him in Cambridge, and which continues his work.