Chemical Communication in a Post-Genomic World (2003) / Chapter Skim
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14 Manduca sexta recognition and resistance among allopolyploid Nicotiana host plants
14 Manduca sexta recognition and resistance among allopolyploid Nicotiana host plants
Pages 69-74
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From page 69... ...
We compare herbivore-recognition and -resistance responses of the diploid species and putative ancestral parent Nicotiana affenuata with those of the two derived allopolyploid species Nicotiana clevelandii and Nicotiana bigelovii. Manduca sexta larvae attack all three species, and in N
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From page 70... ...
sexta OS applications to mechanical wounds is the signature of herbivore recognition that likely organizes much of the tailoring of the defense responses, we determine whether the three species differ in the timing and magnitude of the JA burst. Because the JA burst occurs locally and is not strongly influenced by leaf ontogeny (20)
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From page 71... ...
8, which is published as supporting information on the PNAS web site) significant local and systemic increases in TrypPI activity in all three species in which the absolute increase in the treated leaf (node 1)
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From page 72... ...
However, little is known whether crosstalk among signaling pathways results in adaptive responses, but work on plant-herbivore interactions provides some of the best examples to date. When herbivores attack plants, they cause wounding, but a plant's response to herbivore attack in many cases cannot be mimicked by mechanical wounding or simple JA applications, which are thought to mediate many wound responses (30-32~.
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From page 73... ...
To compare the ability of the diploid species, Na, to recognize attack from M sexta larvae with that of the two allopolyploid species, Nb and Nc, we examined the timing of the JA burst and the subsequently elicited changes in secondary metabolites when M
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From page 74... ...
14586 1 www.pnas.org/cgi/doi/10.1073/pnas.2135348100 remains unknown, this species complex may be an ideal system in which to study the retention and modification of transactivated adaptive responses. The changes in secondary metabolites elicited by Manduca OS in Na are accompanied by a large-scale transcriptional change (6, 8, 10, 11)
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