Lecture 18 - BIO220

130 species in 2 genera plant genotypes differ in

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Unformatted text preview: s No galls •Approx. 130 species in 2 genera Plant genotypes differ in their susceptibility to galling (Wise and •One of eastern N. America’s most abundant wildflowers Abrahamson 2008, Ecology 89:3275–3281) •Colonizes abandoned fields http://www.facstaff.bucknell.edu/abrahmsn/solidago/main.html 17 18 Photos from Crutsinger et al. 2008, Plant and Soil 303: 95 103 -Insects lead to the formation of a gall on the plant -Insect attacks -> Insect lays lar vae inside plant tissue -> Lar vae secrete chemical -> Plant s ecretes hormones back -> Tumour on the plant -Conflict bet ween plant and insect -Plant wants to make some KIND of gull to keep the insect in place and minimize damage -Insect wants gall to be big, so that it can use it as a food source -Battle for the optimal size of the gall -Instead of growing tall, a dense matter of leaves is created -We compare how gall and un-galled plants "do" 3 -Insects prefer to lay their eggs on plants that have more C arbon (more carbohydrates to be consumed) -Prefer to lay eggs in plants that have high N: key nutrient t hat is the fundamental nutrient (nucleic acids etc) -After the plants are attacked, what happens to the degree of N a nd C in the leaves shed by these plants? Rates of Mass and N Decomposition Galled and ungalled plants: Nutrient concentrations and decomposition rates 19/03/2013 Can genetic variation affect nutrient cycling? Yes. • Chain of causation: – Genotypes differ in their chemical properties -Insects are targeting C and N rich plants Mass – Differential attack by insects – Genotypes differ in their chemical response to attack -Changes how fast C and N are lost from leaf litter of plants – Combined set of chemical differences alter decomposition and...
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This document was uploaded on 01/27/2014.

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