In the kitchens of millions of homes across southern China, choy sum—the tender flowering stalk of Brassica rapa var. parachinensis—is prized for its edible stem, whose height at harvest determines both yield and market value. That stem grows because of a carefully choreographed traffic system of plant hormones, and a team of researchers at Guangzhou University has now mapped one of the key pieces of molecular plumbing that runs it. In a study p…
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