摘要
[目的]研究接种福廷瓶头霉对毛棉杜鹃的共生效应及其对加磷处理的响应。[方法]采用回接试验法,设置了4个加磷梯度（P0：不加磷,半磷P1：0.5 mmol/L,全磷P2：1.0 mmol/L,高磷P3：1.5 mmol/L）,分析了接种福廷瓶头霉及加磷对毛棉杜鹃幼苗生长、根系形态和植物氮、磷吸收效率的作用。[结果]（1）在不加磷时,接菌组的苗高、基径、平均冠幅净生长量和叶面积均显著高于CK组;加磷处理后,接菌组和CK组对磷浓度变化的生长响应趋势不一致：加磷处理可促进CK组苗高、冠幅和基径的增长,叶面积呈现先升后降趋势,以P1时最大;加磷对接菌组的苗高影响不显著,对冠幅和基径的增长具有抑制作用,叶面积呈现先降后升趋势,以P2时最低,P0和P3时显著高于P2;（2）接菌组的生物量显著高于CK组,增量为22.46%-242.86%;不加磷时,毛棉杜鹃对共生体依赖性强（322.1%）,高磷时对共生体依赖性中等（243.1%）,半磷和全磷时对共生体依赖性较弱（124.4%-144.6%）。（3）接菌能促进毛棉杜鹃根系的发育,总根长、总表面积和总体积均显著高于CK组;加磷可促进其微根和细根体积比例的增加。（4）接菌可促进毛棉杜鹃幼苗的氮、磷元素吸收效率,其氮、磷吸收效率增量分别为59.16%-310.07%和59.44%-197.91%,在P0和P3条件下,其促进作用更显著。[结论]福廷瓶头霉可通过与毛棉杜鹃形成共生体,促进宿生植的生长及氮、磷吸收,也可有效提高毛棉杜鹃耐磷胁迫能力。
[Objective] Symbiotic effect and responses to adding phosphorus to Rhododendron moulmainense seedling after inoculated with Phialocephala fortinii was studied. [Method] Inoculation pot experiment was used. Four concentrations（ P0： without adding P,P1： adding0. 5 mmol / L P,P2： adding 1. 0 mmol / L P,P3： adding 1. 5 mmol / L P） were added. P. fortinii from the roots of R. moulmainense was used to study the effect on growth,nitrogen（ N） and phosphorus（ P） absorption and responses to adding phosphorus（ P）. [Result]（ 1） The growth,N and P absorption of the inoculated seedlings were better than the control（ CK） without adding P. However,the responses to adding P were different between inoculated treatment and control treatment： adding P could enhance the seedling height,crown and basal diameter.The leaf area showed increasing-declining trend with the highest point in P1; adding P didn＇t have significant effect on seedling height of Pf,but depressed in the basal diameter and crown. The leaf area showed declining-increasing trend with the lowest in P2 and highest points in P0 and P3.（ 2） The biomass of inoculate seedlings were 22. 46%-242. 86% higher than CK. The inoculated seedlings had the strong dependency（ 322. 1%） in P0,moderate dependency（ 243. 1%） in P3,and low dependency（ 124. 4%-144. 6%） in P1 and P2.（ 3） Inoculation could facilitate the root development of R. moulmainense. Their root length,surface areas and total volumes were significantly higher than CK.Adding P could increase micro and fine root percentage of Pf.（ 4） Inoculation could increase the absorption of N / P,varying 59. 16%-310. 07%（ N） and 59. 44%-197. 91%（ P）,the facilitation effects were higher in P0 and P3. [Conclusion] P. fortinii could develop symbionts to enhance seedling growth,N and P absorption of R. moulmainense. It could also improve seeding growth under P stress.
出处
《安徽农业科学》
CAS
2015年第34期225-228,共4页
Journal of Anhui Agricultural Sciences
基金
深圳市城管局科研项目(201408)
关键词
毛棉杜鹃
福廷瓶头霉
共生效应
加磷
根系形态
氮、磷吸收
Rhododendron moulmainense
Phialocephala fortinii
Symbiotic effect
Adding phosphorus
Root morphology
N / P absorption
作者简介
刘永金（1964-），男，广东电白人，教授级高级工程师，硕士，从事风景园林研究。
通讯作者，教授，博士，从事植物学研究。
