Brainfood: Livestock cryo, Yeast evolution, PAs & CC, Genomes, Trifolium ambiguum, Earthworm map, Photosynthesis double, RCTs, Brown rice, DH maize, Breed performance maps

The sweetest things

There’s been a lot of action on the cucurbit domestication front lately. Hot on the heels of a comprehensive Tansley review of all the crops in the family in New Phytologist1 now come two papers out of the Chinese Academy of Agricultural Sciences focusing on the melon and watermelon:

  • Zhao, G., Lian, Q., Zhang, Z. et al. A comprehensive genome variation map of melon identifies multiple domestication events and loci influencing agronomic traits. Nat Genet 51, 1607–1615 (2019) doi:10.1038/s41588-019-0522-8.
  • Guo, S., Zhao, S., Sun, H. et al. Resequencing of 414 cultivated and wild watermelon accessions identifies selection for fruit quality traits. Nat Genet 51, 1616–1623 (2019) doi:10.1038/s41588-019-0518-4.

There are press releases on each of these, of course. But the more interesting take is provided by some IPK researchers2, who mash up the two studies. And provide a nice graphic to summarize the whole thing.

The bottom line(s)? The two different subspecies of melon acquired sweet flesh through different mutations, independently but probably both in India; there was a third domestication event in Africa, but the authors had too little material at hand to say much about this. Melon and watermelon lost their bitterness through convergent evolution, and the latter has benefitted from introgression from two wild relatives, one of which was separately domesticated for its seeds.

  1. Chomicki, G. , Schaefer, H. and Renner, S. S. (2019), Origin and domestication of Cucurbitaceae crops: insights from phylogenies, genomics and archaeology. New Phytol. doi:10.1111/nph.16015. []
  2. Jayakodi, M., Schreiber, M. & Mascher, M. Sweet genes in melon and watermelon. Nat Genet 51, 1572–1573 (2019) doi:10.1038/s41588-019-0529-1. []

One-man root and tuber breeding show comes to town

Welcome to Cultivariable! My name is William Whitson and I breed plants. Cultivariable is my business, where I sell the plants that I breed and, miraculously, seem to be making a living at it. I breed plants for fun, because I am interested in discovering the possibilities. I’m not changing the world here. My discoveries are not going to feed the starving masses, save us from climate change, or expand the frontiers of science, but they might feed you if you grow them. This is mostly a one-man show, meaning that I do everything from weeding to stuffing envelopes alongside the actual breeding work.

William also put together a pretty nice website, from which you can order his stuff. Particularly impressive is his single-minded determination of fully characterize the USDA potato collection. Well worth supporting.