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世界发达国家十分重视国外引种。美国农业部成立了“种子和作物引种局”,集中管理引种工作。目前他们利用在世界各地建立的13个不同的国际农业研究中心专门收集种子,每年约收集1—3万份;苏联全苏作物栽培所常年派有考察队在国外从事考察收集工作;日本热带开发局派22个代表团到印尼、菲律宾、墨西哥、巴西等热带国家考察和收集作物资源;法国
The developed countries in the world attach great importance to the introduction of foreign countries. The United States Department of Agriculture set up the “Introduction to Seeds and Crops” to centrally manage the introduction. At present, they use 13 different International Agricultural Research Centers established around the world to collect seeds and collect about 10,000 to 10,000 copies each year. The Soviet Union Sosu Crop Cultivation Institute has sent expeditions all the year round to carry out investigations and collect work abroad. The tropical development in Japan Bureau sent 22 delegations to Indonesia, the Philippines, Mexico, Brazil and other tropical countries to study and collect crop resources; France