ISSN:
1442-1984
Quelle:
Blackwell Publishing Journal Backfiles 1879-2005
Thema:
Biologie
Notizen:
Extrafloral nectaries formed at the petiole base and periphery of stem nodes of two Fallopia species, Fallopia japonica (= Polygonum cuspidatum) and Fallopia sachalinensis (= Polygonum sachalinense), were examined anatomically, scanning electron microscopy (SEM) observations were made, and the sugar contents of the nectar were analyzed. Ants and other insect species attracted to the extrafloral nectaries were collected and identified, and insect herbivores were observed, collected and identified. Volatile substances were emitted from damaged leaves after insect predation was chemically determined, and a herbivore-induced leaf volatile, (E)-4,8-dimethyl-1,3,7-nonatriene, as a general parasitoid attractant, was emitted 4–6 h after leaf damage. Complex plant–insect interactions in two Fallopia species are discussed in light of the evidence obtained in the present study, and the roles of extrafloral nectaries in combination with chemical signals for defense of insect herbivory are evaluated.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1046/j.1442-1984.1999.00010.x
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