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Milkweed Response To Herbivory

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Resource allocation as a result of herbivory has been predicted in plants, but of late has only been investigated. One way to determine resource allocation as a defense to herbivory is to measure both above ground and belowground biomass and calculate root:shoot ratio as an indicator of resource allocation. This study investigated the induced pattern of defense of resource allocation to root:shoot ratio as a response to simulated mechanical herbivory. Monarch butterfly larvae herbivory were simulated through mechanical herbivory of four treatments. It was found that there was a significant difference between species, but there were no significant differences between treatments. This study examines the divergent evolution in three species of milkweed responses to herbivory.
Introduction
Induced responses to herbivory are universal occurrence in …show more content…

tuberosa, exaltata, and sullivantii).The genus, milkweed, is a native weedy plant that occurs throughout eastern North America in numerous habitats such as roadsides, wooded areas, prairies, and mesic environments (Van Zandt and Agrawal, 2004). A. tuberosa is a species of milkweed that favors dry, sandy soil. A. exaltata is found in moist wooded areas in partial to full sun. A. sullivantii is a prairie species of milkweed that is common across North America. Milkweed is the major food plant for migrating monarch adults and their larvae. When damaged, milkweed plants immediately exude white latex that serves as a physical defense barrier to herbivores. This latex, along with all other plant parts, varies on their effectiveness depending if the herbivory is a specialist and generalist (Malcom and Zalucki, 1996). Resulting from a herbivory event, a plant will respond by allocating resources to belowground biomass thus increasing the root:shoot

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