关键词: 银粉背蕨, 孢子繁殖, 配子体发育

Abstract: The effects of different cultivation conditions on spore germination, gametophyte development nand sporophyte growth of Aleuritopteris a rgentea were studied. The results showed that the spore germination is
Vittaria-type while the gametophyte develop ing is Ceratopteris-type. No significant differenceswere observed in germination rate and time among spores stored at 4 ℃ with periods of 0, 2, 4, 6 and 10 months respectively. The studies on four general solid substrates showed that the growth and development of gametophytes failed either in soil or in peat alone, while the maximum rates of spore germination and sporophyte formation were obtained in the mixed substrate ( the peat and the sand mixed in volume ratio of 1 :1) , up to 65% and 83.2% respectively. Investigation about the sterile cultivation condition found that, of all the mediums with different inorganic salt concentration, MS basal medium is the best for spore germination ( reached 53.3% ) and gametophyte expansion. When the concentration decreased to 1 /8MS, the spores failed to geminate. The results of different sucrose concentrations from 0% to 4% inMSmedium on gametophyte growth showed that,4% was op timum in imp roving gametophyte expansion, increasing embryo inducing and shortening the period from gametophyte to sporophyte.

Key words: Aleuritopteris argentea, gametophyte development, spore propagation