文献类型： 外文期刊

作者： Wang, P. ¹ ; Shu, B. ¹ ; Wang, Y. ² ; Zhang, D. J. ¹ ; Liu, J. F. ¹ ; Xia, R. X. ¹ ;

作者机构： 1.Huazhong Agr Univ, Minist Educ, Key Lab Hort Plant Biol, Wuhan 430070, Hubei Province, Peoples R China

2.Zhejiang Acad Agr Sci, Inst Citrus Res, Taizhou 318020, Zhejiang, Peoples R China

关键词： Arbuscular mycorrhizal fungi;Citrus orchard;Colonization;Diversity;Environmental factors;Spore and hyphal length density

期刊名称：PEDOBIOLOGIA （ 2020影响因子：1.812； 五年影响因子：3.096 ）

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收录情况： SCI

摘要： Root colonization, abundance of spores and hyphae, as well as species diversity of arbuscular mycorrhizal (AM) fungi were analyzed in citrus orchards along an altitudinal gradient. The citrus trees were heavily colonized (50.87-77.45%) by native AM fungi. In citrus orchards located at <600. m above sea level (asl), we recorded more extensive hyphal and arbuscular colonization, and higher spore and hyphal length density. AM fungal colonization, spore density, and hyphal length density were closely correlated with edaphic factors such as available phosphorus, pH, and organic matter. A total of 18 AM fungal species belonging to 3 different orders, Archaeosporales (1 species), Diversisporales (7 species) and Glomerales (10 species), were identified on the basis of spore morphological characteristics. In orchards located at higher altitudes (≥700. m asl), we observed a significant decrease in species richness and Shannon-Wiener index values. However, in all of the surveyed orchards, Glomus aggregatum, Funneliformis mosseae and Rhizophagus intraradices were the dominant species. Isolate frequency and relative abundance of AM fungi exhibited clearly distinct distribution patterns among taxonomic families. Canonical correspondence analysis revealed that the AM fungal community structure was significantly influenced by environmental factors, especially altitude, pH, soil moisture, and available nitrogen. Our data indicated that environmental factors are important in determining AM fungal root colonization, propagule numbers, and species diversity in citrus orchards.