BIO 2137 Lecture Notes - Lecture 16: Thiophene, Phototoxicity, Chemical Ecology
17 Jul 2014
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Document Summary
Chemical ecology of plant secondary metabolites: chemical ecology: study of chmiecally medicated interactions between organisms, secondary metabolites: role in ecology, not primary organisms, provide protections against insects as feeding deterrents/antifeedents, growth reducers, toxins etc. In situ: bug avoidance of toxins in gland on leaf edge (strategy: put there to preserve some leaf for photosynthesis: protection against fungi (phytoalexins, antifungals) Phytoalexins: only apparent after fungal infection, reduces energy required for defences antifungal phototoxic thiophenes marigold infected with fungus fovc resists infection by induction of. Fungus gforl inhibits production of thiophenes and kills plant. Fovc: resists fungus, produces thiophenes that kill it. Forl: throws antifungal compounds, forl inhibits thiophene synthesis: create biochemical interference with other plants. Allelopathy: (calinfornia chaparral) sage inhibits growth of grasses with camphor (driven off during fires) Grasses grow back up to sage brush because little camphor: provide positive communication in legume nodulation or pollination (flower scent), natural enemies.
