Low variation in arbuscular mycorrhizal fungal associations and effects on biomass among switchgrass cultivars
Low variation in arbuscular mycorrhizal fungal associations and effects on biomass among switchgrass cultivars
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DOI：
10.1016/j.biombioe.2018.10.012
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发表时间：
2018-12-01
影响因子：
6
通讯作者：
Pennington, Dennis
中科院分区：
文献类型：
--
作者：
Emery, Sarah M.;Kinnetz, Erin R.;Pennington, Dennis
柳枝稷（Panicum virgatum）是北美主要的多年生生物能源原料作物候选者，有20多个品种可商购。在天然草原，柳枝稷是已知的强烈依赖于丛枝菌根真菌（AMF），但很少有人知道AMF在柳枝稷生物能源系统。AMF可以改变作物产量和地下生态系统功能，因此了解AMF在柳枝稷品种之间的差异可能有助于可持续生物能源系统的发展。使用一个共同的花园实验在密歇根州，美国，我们研究了是否12柳枝稷品种，代表低地和高地生态型，与AMF的变化，如果这种变化与地上或地下作物生物量。品种之间在AMF根定殖、根外菌丝生长或土壤AMF多样性方面没有差异。然而，AMF根定殖是6%，高出低地相比，高地生态型。虽然不同品种的地上和地下生物量，只有一个措施AMF -根定殖-与根生物量显着相关，没有措施AMF与产量相关。AMF往往是更重要的植物生产的网站是营养或水分胁迫，因此AMF对柳枝稷的建立和生长的影响可能是更重要的，当生长在边缘的土地。AMF与柳枝稷品种生产的关系和影响的未来研究应该在一系列反映它们将作为生物能源原料生长的环境条件下进行。
Switchgrass (Panicum virgatum) is a leading perennial bioenergy feedstock crop candidate in North America, with more than 20 cultivars commercially available. In native prairies, switchgrass is known to be strongly dependent on arbuscular mycorrhizal fungi (AMF), but little is known about AMF in switchgrass bioenergy systems. AMF can alter crop yield and belowground ecosystem functioning, so knowing if AMF vary among switchgrass cultivars may improve development of sustainable bioenergy systems. Using a common garden experiment in Michigan, USA, we examined whether twelve switchgrass cultivars, representing both lowland and upland ecotypes, were associated with shifts in AMF, and if this variation was related to aboveground or belowground crop biomass. Cultivars did not differ in AMF root colonization, extraradical hyphal growth, or soil AMF diversity. However, AMF root colonization was 6% higher in lowland compared to upland ecotypes. While cultivars differed in above- and belowground biomass, only one measure of AMF - root colonization - was significantly correlated with root biomass, and no measures of AMF were correlated with yield. AMF are often more important to plant production in sites that are nutrient or water stressed, and so AMF effects on switchgrass establishment and growth may be more important when grown on marginal lands. Future studies of AMF associations with and effects on production of switchgrass cultivars should be done across a range of conditions reflective of the environments in which they will be grown for bioenergy feedstock.