Developmental and morphological responses of mycelial systems of Stropharia caerulea and Phanerochaete velutina to soil nutrient enrichment
Developmental and morphological responses of mycelial systems of Stropharia caerulea and Phanerochaete velutina to soil nutrient enrichment
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DOI：
10.1046/j.1469-8137.1998.00117.x
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发表时间：
1998-03-01
期刊：
影响因子：
9.4
通讯作者：
Boddy, L
中科院分区：
文献类型：
--
作者：
Donnelly, DP;Boddy, L
分解真菌菌丝体觅食系统所产生的模式可能是其获取不同分布碳源的策略的视觉证据。菌丝系统也可能对土壤中分布不均匀的矿物质营养素作出反应。菌丝体反应的性质可能在栖息于富营养化扰动地点的物种之间不同，如Stropharia caerulea（Krillium），和更典型的林地土壤的居民，如绒毛革菌（Escherochaete velutina DC.）：（.）帕尔马干酪通过添加不同浓度的N、P和K，研究了土壤富集对接种体衰减速率和外源菌丝体的扩展速率、生物量和分形维数的影响。在托盘中，从木块上延伸出的P. caerulea和P. velutina穿过压实的非无菌土壤。无论是对土壤养分的富集类型还是富集量，蓝桉都比绒毛桉更敏感。绒毡毛蕨生长快，生物量大，接种体腐烂快。caerulea在大多数条件下，前者的增长率和资源衰减率在土壤养分富集的范围内保持稳定。相比之下，形态S，蓝细菌改变丰富的土壤相比，控制与更大和更明显的扇形（分歧的单独菌丝）的觅食菌丝体前。这些变化反映在分形值上。扩展速率和生物量生产。在施氮土壤上，蓝绿藻的生物量低于对照，而在施磷土壤上，蓝绿藻的生物量高于对照，在0.13- 0.27mgPg（-1）风干土壤上，蓝绿藻的生物量最大。接种体的腐烂率与菌丝生长速率往往呈正相关。这些响应表明，S. caerulea是能够迅速响应一系列的土壤养分富集，这是讨论的两种真菌表现出不同的觅食策略。
Patterns produced by foraging mycelial systems of decomposer fungi might be the visual evidence of strategies for obtaining differently distributed carbon sources. Mycelial systems might also be responsive to unevenly distributed mineral nutrients in the soil. The nature of the mycelial response might differ between species inhabiting eutrophicated disturbed sites, such as Stropharia caerulea (Kriesel), and inhabitants of more typical woodland soils, such as Phanerochaete velutina DC.: (Pers.) Parmasto. We examined the effect of enrichment of soil by addition of different concentrations of N, P and potassium on inoculum decay rate and on extension rate, biomass production and fractal dimension (determined by image analysis) of extra-resource mycelia of S. caerulea and P. velutina extending from wood blocks across compacted non-sterile soil in trays.S. caerulea was more responsive than P. velutina to both type and quantity of soil nutrient enrichment. P. velutina grew more rapidly, produced more biomass and decayed inocula more rapidly than S. caerulea under most conditions, rates of growth and resource decay of the former remaining stable over a range of soil nutrient enrichments. In contrast, morphology of S, caerulea altered on enriched soils compared to controls with greater and more pronounced fanning (divergence of separate hyphae) of the foraging mycelial front. These changes were reflected in fractal values. Extension rate and biomass production of S. caerulea was less than controls on N-amended soil, but greater on P-amended soils, with the greatest biomass produced on 0.13-0.27 mg P g(-1) air-dried soil. Decay rate of inocula was often positively related with mycelial production rates. These responses indicate extra-resource mycelium of S. caerulea is able to respond rapidly to a range of soil nutrient enrichments, and this is discussed in terms of the different foraging strategies exhibited by the two fungi.