美国国家植物种质系统美国国家植物种质系统(National plant Gremplasm System—NPGS)由美国农业部农业研究局管理,并与各州密切协作。其任务是负责搜集、评价、分类、贮存和分发来自全世界的植物种质。现引进国内外植物种质约40万份,其中包括作物的野生和草本亲缘种、培育的品种、某些稀有的和濒临灭绝的物种以及各种遗传材料。后者有人工与天然变异、遗传性奇特的细 National Plant Germplasm System The National Plant Gremplasm System-NPGS is managed by the U.S. Department of Agriculture’s Agricultural Research Agency and works closely with the states. Its mission is to collect, evaluate, classify, store and distribute plant germplasm from all over the world. At present, about 400,000 plant germplasm resources are introduced at home and abroad, including wild and herbivorous plants, cultivated varieties, some rare and endangered species and various genetic materials. The latter has artificial and natural variation, genetic peculiar thin