Seasonality and host preference of arbuscular mycorrhizal fungi of five plant species in the inner mongolia steppe, china.
Seasonality and host preference of arbuscular mycorrhizal fungi of five plant species in the inner mongolia steppe, china.
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DOI：
10.1590/s1517-83822011000100008
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发表时间：
2011-01
期刊：
影响因子：
--
通讯作者：
Guo LD
中科院分区：
文献类型：
--
作者：
Su YY;Sun X;Guo LD
对内蒙古草原常见的5种植物丛枝菌根侵染的季节变化、寄主选择性和群落组成进行了研究。5种植物的AM根长定殖率不同，在生长初期(5月和6月)和生长后期(9月)普遍较高，8月较低。从这5种植物根际土壤中共分离到5属18种AM真菌，除Acaulospora sp.、Glomus constratom、G.diaphanum和Glomus sp.外，大多数AM真菌没有寄主特异性。表现出一定程度的寄主偏好。5种植物的优势种为白色球孢菌、绿色球囊霉和地霉菌，在生长季节内表现出不同的产孢型式。AM真菌孢子密度和物种丰富度在5~9月呈上升趋势，10月份呈下降趋势，同月差异较大。多变量分析表明，季节和寄主对AM真菌孢子密度、物种丰富度和Shannon-Wiener多样性指数有显著的共同影响，且季节的影响大于寄主。
The seasonal change and host preference of arbuscular mycorrhizal (AM) colonization and community composition of five common plant species Agropyron cristatum, Anemarrhena asphodeloides, Cleistogenes squarrosa, Leymus chinensis, and Stipa grandis in the Inner Mongolia steppe were investigated. The AM root length colonization rates were different among the five plant species and were generally high in early (May and June) and late (September) growth seasons and low in August. A total of 18 AM fungal species representing five genera were isolated from rhizosphere soils of the five plant species, and most AM fungi had not host specificity, except that Acaulospora sp., Glomus constrictum, G. diaphanum and Glomus sp. showed a certain degree of host preference. Glomus albidum, G. etunicatum and G. geosporum were the dominant species and showed various sporulation patterns in the five plants during the growth seasons. The AM fungal spore densities and species richness increased from May to September and decreased in October and were different in the same month in the five plants. Multivariate analyses revealed that season and host significantly co-affected the AM fungal spore density, species richness, and Shannon-Wiener diversity index, and the season had higher influence than the host.