不同因素对离体培养的银杏幼茎腋芽生长发育的影响
Effects of Various Factors on the Growth and Development of Cultured Axillary Buds of Ginkgo biloba in vitro
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摘要: 银杏(Ginkgo biloba L.)是世界上保存下来的孑遗植物,在植物界有“活化石”之称。银杏种子富含维生素、矿物质,可供食用;叶可提取黄酮类物质,广泛用于心脑血管疾病的治疗。银杏雌雄异株,用实生苗或分蘖苗造林,15~20 a后开始结种,种子产量低并有后熟期,不耐储藏,且种子价格昂贵,播种苗雌株比例低,早期性别难以鉴定,故以传统的方法繁殖银杏苗木存在一定的困难1。近年来,组织培养技术用于植物快繁已取得显著成果,可望成为获得银杏苗木的重要方法之一。关于银杏茎段离体快繁,仅见罗紫娟2有过初步报道。1994年以来,作者研究了不同基本培养基、激素和有机附加物等多种因素对银杏幼嫩茎段快繁的影响,现将主要结果报道如下。Abstract: The stem of Ginkgo biloba were cultured on MS,modified MS and DCR basal medium,supplemented with various concentration of hormones—NAA,ZT(zeatin)and two types of nurture-CH(casein hydrolysate)and Ade(adenine). The aim was to study the effects of various basal medium,different hormones and nurtures on the growth and development of Ginkgo biloba stem. The result showed that the modified MS with CH 500 mg·L-1 was the best medium for inducing the development of axillary buds;the medium with NAA,ZT and Ade promoted axillary buds to be callus and inhibited them developing into shoots. The shoot rate was 89.3%. After cultured for 40 days,the clustered buds were emerged from axillary buds. The detached buds from clustered buds were cultured on modified MS basal medium or supplemented with CH 500 mg·L-1. The shoots grew well,and the reproduction coefficient was 3. The shoots from apical buds were also reproduced,and the reproduction coefficient was 4. The shoots were induced to root on MS+NAA 0.1 mg·L-1 medium,and the rooting rate was 33.3%.