Biology 2217B Lecture Notes - Lecture 14: Plant Propagation, Corm, Monocotyledon

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In traditional diets, provides the lion"s share of carbohydrates: diversity of food sources has given more developed countries a variety of alternatives. Storage roots: tuber, enlarged storage tips of rhizome, tuberous root, fibrous roots, enlarged with food reserves, can function in asexual reproductive and food storage, taproot, enlarged primary roots, food storing organs for biennial plants. Tuberous storage roots: sweet potato: often misnamed as yams, modified fibrous roots enlarged with food reserves. Fleshy, erect underground stems (storage is in the stem, not in the leaves as in bulbs) Fruit a berry or capsule: 85 genera, ca. Includes tomato, potato, tobacco, eggplant, datura, and deadly nightshade. Potatoes: white, sweet, and yams, each a different species in a different family. White potato (solanum tuberosum) - tuber: origin: andean highlands at about 3500m above sea level (peru, collected wild ~8,000 yrs bp and cultivated shortly after. Spanish conquistadores took potato to spain: spread to the rest of europe, reproduction chiefly vegetative:

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