History of Horticulture: Lecture 41Lecture 4Lecture 4Geography of Plant DomesticationAlphonse de Candolle (1806–1893)Charles Darwin (1809–1882)1858 Origin of SpeciesNicholas Ivanovitch Vavilov (1887–1943)Alphonse De Candolle as a young botanist and at the height of his careerAlphonse de Candolle (1806–1893)1. Presence of wild relatives2. Historical3. Names (linguistics)4. Archeology (limited in De Candolle’s time—now a major source of evidencedue to carbon dating techniquesOrigin of Cultivated Plants (1882)History of Horticulture: Lecture 42Charles Darwin as a young manand at the height of his careerCharles Darwin (1809–1882)“On the Origin of the Species by Means of Natural Selection, or the Preservation of FavouredRaces in the Struggle for Life” (1859)“The Origin of the Species” for shortThe most influential book in all biologyDarwin’s Famous WorkEvolution occurs; species not fixed at “creation”Evolutionary change gradualPrimary mechanism is struggle for existence and survival of the fittestAll species arose from a single original life form Concepts of DarwinismHistory of Horticulture: Lecture 43N.I. Vavilov (1887–1943)Law of Homologous Series in Variation (1920)Centers of Origin of Cultivated Plants (1926)Center of Diversity = Center of OriginPlant species not uniform8 Primary world centersComprise small portion of earth (2–3% of land area)640 species listed 5/6 Old World;1/6 New WorldVavilov’s Contribution to Plant Geography and Evolutionary GeneticsJack Harlan (1917–1998)History of Horticulture: Lecture 44Just a few of the possible variations in tomatoesHistory of Horticulture: Lecture 45Seeds of many different plant varieties being packages for storageSeed vault at the National Seed Storage Laboratory at Fort Collins, ColoradoHistory of Horticulture: Lecture 46Cryogenic preservation of seeds at Fort
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