Introduction breeding

Japanese: 導入育種 - どうにゅういくしゅ（英語表記）introduction breeding

A method of breeding. It refers to the process of introducing new crop or livestock varieties from abroad and either using them as is or using them as a basis to select varieties suited to the country's own climate. When introducing new foreign crop varieties, they are first grown in isolation and rigorously tested, especially to prevent the introduction of any new accompanying pathogens or pests, and only safe varieties are transferred to normal fields and comparative tests are conducted between varieties. When a large number of individuals of the same variety are cultivated, genetic mutations that were not previously noticeable may appear because the environmental conditions are significantly different from those in the country of origin.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

品種改良の手法の一つ。作物･家畜の新しい品種を外国から導入してそのまま利用するか，あるいはこれをもとにして自国の風土に適した品種を選びだす操作をいう。新しく外国の作物品種を導入するときには，とくに随伴する新しい病原菌や害虫を持ちこまないように，まず隔離栽培をして検定を厳重に行い，安全なものだけを普通畑に移し，品種間の比較試験を実施する。同一の品種でも多数の個体を栽培すると，原産地とは風土の環境条件が著しく違うために，これまでに目だたなかった遺伝変異が現れてくることがある。

出典　株式会社平凡社世界大百科事典第２版について　情報

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