Introductory Plant Pathology
Introductory Plant Pathology PPTH 324
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This 0 page Class Notes was uploaded by Rosemary Schuster on Sunday November 1, 2015. The Class Notes belongs to PPTH 324 at North Dakota State University taught by Jack Rasmussen in Fall. Since its upload, it has received 26 views. For similar materials see /class/233233/ppth-324-north-dakota-state-university in Pathology at North Dakota State University.
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Date Created: 11/01/15
amensalism A symbiotic relationship in which one organism is harmed or inhibited and the other is unaffected Examples of amensalism include the shading out of one plant by a taller and wider one and the inhibition of one plant by the secretions of another known as allelopathy secretion 1 The process of secreting a substance from a cell or gland 2 A substance such as saliva mucus tears bile or a hormone that is secreted commensalism adj Of relating to or characterized by a symbiotic relationship in which one species is benefited while the other is unaffected mutualism A symbiotic relationship in which each of the organisms benefits ltgtIn obligate mutualism the interacting species are interdependent and cannot survive without each other The fungi and algae that combine to form lichen are obligate mutualists ltgt In the more common facultative mutualism the interacting species derive benefit without being fully dependent Many plants produce fruits that are eaten by birds and the birds later excrete the seeds of these fruits far from the parent plant While both species benefit the birds have other food available to them and the plants can disperse their seeds when the uneaten fruit drops parasitism A symbiotic relationship in which one organism the parasite benefits and the other the host is generally harmed Parasites derive nutrition from their host and may also gain other benefits such as shelter and a habitat in which to grow and reproduce