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Kim Dej

October 31 , 2012 Biology 2F03: Fundamental and Applied Ecology Mutualism (1) Mutualism - interactions between individuals of different species that benefit both partners - many browsers are ruminant : symbiotic organisms help process cellulose into a form that’s digestible for animals - hummingbirds go into deep hibernation - fungus root symbiotic relationships: many of the larger plants grow roots into the soil, fungi become intermediate between soil properties and roots Question - are these species that do not engage in mutualism or, how common mutualism is: humans are headed in that direction Plant performance and cycorrhizal fungi - associated with roots of plants - can plants live without them? - Fossil records: mycorrhizae arose early in the evolution of land plants, perhaps as long as 400 million years ago - Mutualism between plant and fungi had plenty of time to get refined Leaf water potential - water concentration in the leaves versus the water concentration in the air - lower potential means that the leaf is getting drier - agropyron with mycorrhizae maintained higher leaf water potential throughout a hot summer day - more than twice as much water potential with mycorrhizae - with increased performance, plants can afford to invest less in root biomass and divert resources to the green shoot Plan
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