Biology 4218A Lecture Notes - Lecture 12: Quantitative Trait Locus, Suberin, Vacuole
13 Dec 2016
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Document Summary
Forces of crop domestication often oppose those of natural selection. In natural selection, individual fitness is favoured, such that fertility, diversity, and persistence are the major aspects involved. However in crop domestication, community performance is favoured, involving yield, uniformity, and predictability. Since we are picking out the specific plant with specific traits we want, there will be low variability (i. e. narrow genetic diversity). This makes crops more susceptible to disease (e. g. late blight of potato) Steps for pathogen: find host, contact, penetrate, proliferate. Pre-existing (constitutive): plant can have these defenses before it encounters a pathogen. Cork, abscission layers: abscission layer grows around infected part so it falls off. Tyloses, papillae, lignitubers: tylose is a defense induced against vascular wilt pathogens like verticillium wilt, that grows through the vasculature of the plant, blocking pathogen entry. Pre-existing (constitutive): antimicrobials (phenolics, terpenoids, alkaloids, glucosinolates)
