VA真菌对构树(Broussonetia papyrifera)幼苗物质代谢的影响

石灰岩地区因其干旱瘠薄的生境特征，植被难以恢复，然而仍有一些适生植物如构树生长良好，原因可能与根际微生物有关。就石灰岩适生植物构树（Broussorretia papyrifera）进行菌根真菌摩西球囊霉（Glomus mosseea）、地表球囊霉（Glomus versiforme）、透光球囊霉（Glomus diaphanum）的单独接种、混合接种和不接种处理，幼苗生长3个月后测定其生理指标，以期从代谢水平上了解植物对VA真菌的生理响应。结果表明：构树幼苗叶片可溶性糖、蛋白质，脯氨酸和叶绿素均较非接种处理有不同程度的显著提高，丙二醛含量则较对照降低。各代谢物质存在一定相关性。在物质代谢水平上，构树幼苗对不同VA真菌处理有不同的生理响应。宿主植物和VA真菌之间存在一定的相互选择。接种VA真菌提高了石灰岩适生植物构树的抗逆性。

The effects of VA mycorrhizal fungus inoculation on material metabolisms of Broussonetia papyrifera seedlings

It's difficult to restore vegetation in limestone area,due to the severe and thin soil layer of the limestone habitat.However,some plants adaptive to limestone soil like Broussonetia papyrifera grow in this habitat,the reason maybe that these plants possess rhizospher microbes like Vesicular-arbuscular mycorrhizal fungus.In this paper,an experiment was conducted on Broussonetia papyrifera seedling by disposals of single inoculation,co-inoculation and non-inoculation using three mycorrhizal fungus,which are Glomus.mosseea,Glomus.versiforme and Glomus.diaphanum.Some physiological indexes of leaves are measured to study the metabolism response in this experiment after 3 months.The results show that the concentrations of soluble sugar,protein,proline and chlorophyl a and b are significantly increase in the leaves of the host plants in inoculation group compared with none-inoculation.However,the malondialdehyde concentration decrease or remain equivalently in inoculation disposal.All the substances have certain correlation at physiological metabolism.Even as metabolite,there are different physiologically response in different inoculation disposals by AMF.The interactional selection exist in host plants and AMF.It could be conclude that inoculation AMF could enhance the stress tolerance of Broussonetia papyrifera seedling growing in limestone habitat.