China had initially formed a preservation system for germ plasma resources from crops , including one national germ plasma bank for long - term preservation and a duplicate one , 23 local germ plasma banks for mid - term preservation , and 25 national germ plasma nurseries , of which two are for test - tube culture 到1995年底,中國(guó)已初步形成農(nóng)作物種質(zhì)資源保存體系,建成國(guó)家級(jí)貯存種子長(zhǎng)期庫(kù)及復(fù)份庫(kù)各1座,地方中期庫(kù)23座,國(guó)家級(jí)田間種質(zhì)圃25個(gè),其中試管苗圃種質(zhì)庫(kù)2個(gè)。