Plsc203- study guide test 2

Plsc203- study guide test 2 - Geneticerosion=/variability....

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Genetic erosion= loss of crop biodiversity/variability. Affects all plant germplasm. Germplasm= all genetic resources that can be used to improve crop plants.  1) Wild relatives (highest domestication/gene variation)- high diversity 2) Land races- type of variety that farmers in developing countries grow. The first plants that  were domesticated. Not uniform.  3) Old varieties 4) Current varieties (lowest domestication/gene variation)- less diversity Irish potato famine- Only 2-3 varieties of potato were being grown and they got a disease  called leaf blight. 1845. Potato originally comes from Peru/Bolivia. Killed about 1 million  and 1 million emigrated. At the time, the Irish were growing potatoes for the British  because they were under the Britain governments control. “Cloning” produces the exact  same genetics and therefore the infected potatoes/plant pathogens spread quickly.  In-situ conservation- actually growing the real plants. Maintained land races and wild  relatives on the farm. In mexico, maize and beans are grown close to their wild relatives.  Advantages are that they preserve the habitat and generate new variation by crossing.  Disadvantages include that they’re not practical b/c of loss of habitat Ex-situ- gene “banks”. Many seeds in a small place and insurance for future generations 
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This note was uploaded on 11/15/2010 for the course PLSC 203 taught by Professor Josecosta during the Spring '08 term at Maryland.

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Plsc203- study guide test 2 - Geneticerosion=/variability....

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