美国银杏的研究现状

银杏于１７８４年由英国引种到美国，美国有２０多个州栽植或研究银杏。美国对银杏生长发育，雄株品种，营养繁殖，基生树瘤，组织培养，性型表达，人工栽培，叶用成分及抗病虫机理等方面均有研究。

Researches on Ginkgo in USA

Ginkgo biloba was introduced into USA from England in 1784.It was grown and researched in more than 20 states in USA.Recently systematic researches are conducted on the development of short and long branches of this species,its embryonic development,variety of male plant i vegetative reproduction,basal burls f tissue culture,expression of sex,culture,effective elements in leal and mechanism of insect and dis-ease resistance.China is the distribution center of this species with a long history of its cultrue.The planting area and yield all rank the first in the world.New in China the annual production of ginkgo fruits is above 8 million kg and up to the end of this century it will reach 10 million kg.Aound 2,130 it will reach 100 million kg.Then it will meet the fundamental demand of the world market.The export of ginkgo leaves from China will also increase annually.The research on this species in China should be strengthened.