蓝桉和尾叶桉混合菌根研究 Ⅰ.菌根合成及真菌间的相互作用  

Studies on Dual Mycorrhizas of Eucalyptus globulus and E.urophylla Ⅰ.Fungal Colonization and Interactions

作　　者：陈应龙[1] 弓明钦[1] MarkBrundrett BernieDell 

机构地区：[1]中国林业科学研究院热带林业研究所,广东广州510520 [2]MurdochUniversity

出　　处：《林业科学研究》1999年第5期452-460,共9页Forest Research

基　　金：中澳合作ACIAR9425项目

摘　　要：采用蜡磨菌与ＶＡ 菌根真菌分别对蓝桉和尾叶桉进行单接种或混合接种，研究结果表明，两种菌根类型的真菌均能在桉树苗木根系上成功地定殖，分别合成了外生菌根、ＶＡ 菌根和混合菌根，证实了桉树不仅是菌根营养型树种，而且能形成多种菌根类型。ＶＡ 菌根感染率在接种初期较高，但随时间的推移有降低的趋势；而外生菌根菌初期合成菌根的速度较慢，但单位长度根段内菌根根尖数目有明显增加的趋势。与单接种ＶＡ菌根真菌苗木相比，外生菌根真菌抑制了ＶＡ 菌根菌在根系上的进一步侵染，体现在较低的ＶＡ 菌根感染率；而外生菌根菌显示出了较强的竞争能力，并能在接种后９ 周时开始形成子实体。在混合菌根中，外生菌根有逐步替代ＶＡ 菌根的发展趋势，两种类型的菌根真菌间存在一定的竞争性作用关系。This paper represents the first part of the results from a glasshouse experiment designed to compare the competition of ECM and VAM fungi on root colonization and effects on growth of two Eucalyptus species ( E.globulus and E.urophylla ).One ECM fungus( Laccaria lateritia ) and three VAM fungi belonging to genera Glomus,Acaulospora and Scutellospora ,along with field soil as well,were used to inoculate Eucalyptus seedlings alone or in combination.Both ECM and VAM fungi colonized and formed mycorrhizal associations on roots of inoculated seedlings,though infective rates of VAM and ECM tips per meter varied according to inoculant fungi and plant ages. There were some regressive interactions for colonization between the two fungi,as a general trend for ECM root colonization levels to increase with time at the expense of VAM colonization was observed during 16 weeks. The effect of phosphorus levels in soils on mycorrhizal formation was discussed.

关 键 词：混合接种 菌根合成 外生菌根 VA菌根 桉树 

分 类 号：S718.81[农业科学—林学]