Science, Space and Technology News 2024
The DNA transfer method shown involves using a syringe to inject a specific species of bacterium into the petunia stigma to activate targeted genes, then isolating the resulting proteins. Credit: Purdue Agricultural Communications photo/Tom Campbellhas begun translating the intricate molecular language of petunias. The grammar and vocabulary of this language are deeply concealed within the countless proteins and other compounds that populate the cells of flowers.
Plant scientists have long known about this immunization-like priming, but until a few years ago, they had no way to study the process. They needed a marker showing that the plants had detected the volatile compounds.. The team includes researchers from Purdue, Université Jean Monnet Saint-Etienne in France, and the University of California-Davis.
A research team led by Purdue University scientists has documented new details about how petunias use volatile organic compounds to communicate.The study described how a plant’s floral tubes produce volatile compounds to sterilize their stigma, the part of the pistil that collects pollen, to protect against attack by pathogens.
Measurements made from photographs showed statistical differences in the stigma size upon exposure to volatiles, said the Science study’s lead author, Shannon Stirling, a Ph.D. student in horticulture and landscape architecture at Purdue. “You can see that this is a consistent trend,” she said. “Once you’ve looked at enough stigmas, you can see by eye that there is a slight difference in size.
Surprisingly, the identified karrikin receptor showed the ability to selectively perceive signaling from one type of sesquiterpene compound but not its mirror image, a trait called “stereospecificity.” The receptor appears to be highly selective to the compound, said study co-author Matthew Bergman, a postdoctoral researcher in biochemistry at Purdue.
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