A foliar endophyte increases the diversity of phosphorus-solubilizing rhizospheric fungi and mycorrhizal colonization in the wild grass Bromus auleticus
A foliar endophyte increases the diversity of phosphorus-solubilizing rhizospheric fungi and mycorrhizal colonization in the wild grass Bromus auleticus
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DOI：
10.1016/j.funeco.2015.07.001
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发表时间：
2015-10-01
期刊：
影响因子：
2.9
通讯作者：
Novas, M. V.
中科院分区：
文献类型：
--
作者：
Arrieta, A. M.;Iannone, L. J.;Novas, M. V.
无性的表观内生植物与草建立互惠共生关系，提高寄主的适合度，改善周围环境。为了验证这种共生关系增加了解磷真菌(PSF)的丰度和多样性的假设，进行了盆栽试验，组合了两种内生状态：感染埃皮克罗的(E+)和未感染(E-)的无芒雀麦，以及从农业(A)和非农业(NA)采集的两种土壤类型。在试验开始时和引入青海假单胞菌12个月后，对土壤真菌进行分离，并测试其对无机磷(PI)的溶解能力。还分析了丛枝菌根在E+和E-植株上的定植情况。PSF丰度受内生状态和土壤类型的影响，以E-NA处理最高，E+A处理次之。NA土壤的PSF多样性高于A土壤，E+处理的PSF多样性高于E-处理。丛枝菌根真菌在E+植株中的定殖率较高。我们推测，随着PSF多样性的增加，表观内生真菌和菌根真菌之间的正相关将产生植物可利用的磷(P)的增加。(C)2015年爱思唯尔有限公司和英国真菌学会。版权所有。
Asexual Epichloe endophytes establish mutualistic symbioses with grasses, improve fitness of their hosts and modify the surrounding environment. To test the hypothesis that this symbiotic association increases the abundance and diversity of phosphate-solubilizing fungi (PSF), a pot experiment was conducted combining two endophytic statuses: Epichloe-infected (E+) and non-infected (E-) Bromus auleticus plants, and two soil types collected from agricultural (A) and non-agricultural (NA) fields. Soil fungi were isolated at the beginning of the experiment and 12 months after the introduction of B. auleticus, and tested for their inorganic P (Pi)-solubilizing capability. Arbuscular mycorrhizal colonization in B. auleticus roots of E+ and E- plants was also analyzed. PSF abundance was affected by the endophytic status and by the type of soil; the highest value was detected in the E-NA treatment, followed by the E+A treatment. PSF diversity was higher in NA than in A soils and higher in soils treated with E+ than in those treated with E-. Arbuscular rnycorrhizal fungi colonization was higher in E+ plants. We hypothesize that the positive association between Epichloe endophytes and mycorrhizal fungi with an increase in the PSF diversity would generate an increase in the phosphorus (P) available to plants. (C) 2015 Elsevier Ltd and The British Mycological Society. All rights reserved.