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Plant germplasm obtained from the origin of the genetic material can be useful for varietal improvement. For guayule (Parthenium argentatum Gray.) germplasm, 343 accessions were collected from 53 locations in 20 municipalities within five provinces (Coahuila, Durango, Nuevo Leon, San Luis Potosi and Zacatecas) in Mexico. Rubber and resin contents were determined for these accessions to identify...
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