A host plant’s survival may depend on powerful chemicals swimming in its vines
Little is known about how the parasitic Rafflesia—a genus that produces the world’s largest and stinkiest flower—infects its host plants. Rafflesia spends most of its life span as a tangle of strandlike cells lurking inconspicuously underneath the bark of a woody vine called Tetrastigma, before emerging as drab, golf ball–sized buds. These eventually burst into fleshy blooms that smell like rotting meat and can reach 20 pounds and three feet across.
Such substances have never been reported before in Tetrastigma or other creepers in the same family . Molina says she is intrigued that Tetrastigma can produce such biologically potent substances, and the precise reasons it does so are not yet known. She suspects Tetrastigma may brandish these alkaloids preemptively to stave off infection. Perhaps, she adds, Rafflesia’s opening gambit is to suppress this secretion and besiege its host.
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