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Lecture 20

BIO318 Lecture 20 (Nov 20).docx

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University of Toronto Mississauga
Sanja Hinic- Frlog

BIO318 Lecture 20 - Video - Science news (from o Found another human species that they didn’t know about before o Denisovans and Neanderthal genomes - World Map o Denosovian mixture - Plants and their behaviour o Venus fly trap - Plants respond to their social/biological environment: four stories - Plants and mormon crickets o Sage brush - Native tobacco plant - Tobacco plants respond to changes in sage brush o When predator is feeding on sage brush, the tobacco plant has evolved to detect neighbouring plants being foraged; releases chemical that Is detectable o So tobacco plants increases its secondary compounds o Graph shows when there’s no herbivores around, and when there are herbivores foraging on neighbouring plants (increase of PPO) o Actual chewing of leaf on the sage plant which is sensed by the tobacco plant - Clipping sage plants o Also releases the chemical - Tobacco plant fitness o When unclipped, there were more damages to the tobacco plant than the clipped sage brush or when herbivores were feeding on it - Methyl jasmonate released by damaged sagebrush appears to act as a volatile plant hormone o Chemical “screams” of sagebrush - Parasitoid wasps o Caterpillar dies from maggot holes that are laid by wasps o Wasps are friends
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