Submitted by GalFisk t3_10ejfsw in askscience
DaylightsStories t1_j4zxl2r wrote
Reply to comment by GalFisk in What does the ricin molecule do in the castor bean? by GalFisk
I suspect it was probably a less deadly toxin beforehand(given that the family castor is in, Euphorbiaceae, are notoriously likely to be poisonous) although the subject of plant evolution in general is poorly studied and I would not be surprised if this has never been looked into.
almostbig t1_j500s6z wrote
it has, but not really surprisingly the answer is:
1 - plant make protein for defense
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2 - plant happy
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3 - Florida or whatever happens randomly
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4 - Ricin
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