As a cabbage caterpillar eats through leaves of the mustard plant Arabidopsis, a wave of calcium crossing the plant, revealed by fluorescent light, triggers defense responses in distant
leaves. This video is part of research by UW–Madison botany professor Simon Gilroy that shows how waves of calcium crisscrossing a plant help it respond to attacks by preparing for future threats. The work was published in Science in September of 2018.

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