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In page Systemin:
"Plants grown under UVB light are more resistant to insect herbivory compared with plants grown under filters that exclude the radiation. When tomato plants are exposed to a pulse of UVB radiation and then weakly wounded, PIs accumulate throughout the plant. By themselves, neither the radiation nor weak wounding is sufficient to induce systemic PI accumulation. Tomato cell cultures respond similarly, with systemin and UVB acting together to activate MAPKs. Short pulses of UVB also cause alkalisation of the culturing medium.[2]
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