Some plants send distress calls when under attack from insects. Nearby plants then release chemicals which draw other insects into the area, to attack the attackers
That at least some of these calls for help travel underground is also clear, but the details were murky. Now, a study published inby Emilio Guerrieri of the Institute for Sustainable Plant Protection, in Turin, has shown that these subterranean cries for help are made using a molecule,“Awakenings” is based on cases described in his own, non-fiction, book of that name by Oliver Sacks, a psychiatrist who lived in New York.
They raised 80 bean plants, infested 40 of them with aphids two weeks after germination, and then, three days later, tested samples of the hydroponic solution of each using a process called bioassay-guided fractionation. The principal difference they found turned out to be levels ofL-DOPA to half of each batch, they discovered, first, that those receiving the molecule, but not the others, were indeed attractive to, and, second, that these plants produced more than the others of three particular chemicals which previous work has suggested are the wasp-attracting substances.plays a role in communication in species as diverse as human beings and bean plants is intriguing. But it is also useful information. What works for broad beans probably works for a range of other crops.
Belgique Dernières Nouvelles, Belgique Actualités
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