Evolution of Crops. Audrey Darrigues. H&CS830 Dr. David Tay Autumn 2003
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1 Evolution of Crops Audrey Darrigues H&CS830 Dr. David Tay Autumn 2003
2 What is evolution? Opening out, an unfolding, a realization of potential as the opening of a flower or the germination of a seed Gradual process rather than sudden or cataclysmic events Change with time at various magnitudes (Harlan, 1975)
3 What is a crop? Crops are artifacts made and molded by man as much as a flint arrowhead, a stone ax-head, or a clay pot. (Harlan, 1975)
4 How about evolution of crops? From wild progenitors to fully domesticated races
5 Domesticated vs. cultivated crops? A domesticated crop (animal or plant) has been genetically altered from their wild state and brought into a man s home A cultivated crop has been tended for afield through tilling, seedbed preparation, weeding, pruning, watering, fertilizing, etc.
6 Symbiotic relationship A fully domesticated plant cannot survive without the aid of man, but only a minute fraction of the human population could survive without cultivated plants. Crops and man are mutually dependent
7 The Gramineae or the Poaceae Avena (oats) Hordeum (barley) Oryza (rice) Saccharum (sugar cane) Secale (rye) Sorghum (sorghum) Triticum (wheat)
8 The Gramineae or the Poaceae Grass family includes the Maydae Zea (maize) Euchlaena (teosinte) Tripsacum
9 The Gramineae or the Poaceae Maize Teosinte (Lauter and Doebley, 2001)
10 The Gramineae or the Poaceae Tripsacum inflorescence Tillering Tripsacum grasses
11 Evolution of maize
12 Tripsacum x = 18? Some later introgression Differentiation c. 75,000 BC Gathered c. 10,000 BC Domestication Started c. 5,000 BC? popcorns Zea maize x = 10 Euchlaena teosinte x = 10 Continued Euchlaena introgression Corn Belt maize from Southern Dents x Northern Flints Local races widely differentiated in Central and S. America Future breeding Hybrid corn, 1930 s Old World tropics Improved populations on wider genetic base Old World temperate zone
13 Recent history From time of colonization of the Americas until the mid-1800s, little formal breeding From s, beginning of the corn show era From 1900s to present, open-pollinated populations to hybrid
14 U. S. Corn yields 1866 to 1996
15 Prospect Genetic variability: bottleneck? Use of tropical germplasm Molecular breeding: use of Marker Assisted Selection to identify genes with a great influence on agronomic traits Corn for food: 85% of corn production used as feed or food. Improvement of the nutritional quality of maize protein.
16 Solanaceae family Lycopersicon (tomato) Capsicum (sweet peppers, chili peppers, paprika) Solanum (potato, eggplant) Nicotinia (tobacco) Physalis (Cape gooseberry, husk tomato)
17 Characteristics of the Solanaceae Flower: small to large & showy, regular, perfect Fruit: capsule or berry with many seeds. Often colorful and animal dispersed Pollination: self- or insect-pollinated Commonly contain alkaloids, of which tropane alkaloids are particularly poisonous (belladonna)
18 Evolution of tomato Lycopersicum esculentum Lycopersicon esculentum var. cerasiforme
19 Cytogenetics of tomato For all species: 2n = 2x = 24 L. esculentum and its near relatives are selffertile. Other species display different mating systems from strict autogamy to strict allogamy in selfincompatible taxa. L. esculentum can be hybridized with all other species of Lycopersicon and certain tomato-like Solanum spp
20 Morphological evolution Ancestral self-incompatible species Var. cerasiforme Latin American cultivars Older European & N. American cultivars Modern Californian cultivars
21 Early history Native to western South America Wild form of Lycopersicon esculentum var. cerasiforme, found in Mexico, Central America, and other parts of South America Mexican origin of cultivated tomatoes transported to Old World
22 Recent history Improvement largely dependent Application upon selection of standard Selection to breeding for resistant methods: Development of F 1 strains of tomato; chance pedigree variants selection, (mutation, backcross hybrid use of cultivars; related wild species molecular and breeding; spontaneous outcrossing exotic or germplasm; transgenics great for assortment of genetic yield increase disease and variation herbicide resistance
23 Evolutionary relationships of tomato
24 Lycopersicon 9 spp., all 2n = 2x = 24 Various mating Systems, western South America Esculentum var. Cerasiforme weedy, inbred self-incompatible, widespread in tropical America Human selection in MesoAmerica, larger fruits, new colors, etc. Introgression Pimpinellifolium weedy inbred coastal Ecuador and Peru Wider genetic base Primitive cvs in tropical America Spread to Europe,thus to other north temperate areas in 16 th -19 th centuries Modern cvs Hybridization & selection Temperate cvs narrow genetic base, highly inbred, pure-line breeding in early 20 th century
25 Literature cited and Literature of interest Atherton, J. G. and J. Rudich Tomato Crop. Chapman and Hall, New York. De Candolle, A. P Origine des Plantes Cultivees. Librairie Germer Bailliere et Cie. Paris. Fussell, B The Story of Corn. North Point Press, New York. Gay, J. P Fabuleux Mais: Histoire et avenir d une plante. AGPM, Pau, France.
26 Literature cited and Literature of interest Harlan, J. R Crops and Man. Amer. Soc. Agron., Madison, Wisconsin. Kalloo, G Genetic Improvement of Tomato. Springer- Verlag, New York. Smartt, J. and N. W. Simmonds Evolution of Crop Plants. 2nd edition. Longman, Harlow, U.K. Vavilov, N. I The Origin, Variation, Immunity, and Breeding of Cultivated Plants (translated by K. S. Chester). Ronald Press, New York.
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