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Identification of Constraining Experimental-Design Factors in Mycorrhizal Pot-Growth Studies

机译：菌根贮藏研究中约束性实验设计因素的确定

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In the objective of testing the design of pot-growth experiments, we conducted two greenhouse studies of a “dwarf” sunflower cultivar and an arbuscular mycorrhizal (AM) fungus to determine how pot size and inoculum distribution affect plant growth and AM symbiosis. As predicted, large-potted plants developed a greater overall biomass and root colonization than small-potted ones which we attributed to the larger “rootable” volume. Furthermore, plants grown in a band of high density inoculum substrate showed a higher prevalence of fungal vesicles (sites of lipid storage) indicating a more advanced level of root colonization compared to those grown in a dispersed inoculum substrate; this likely being due to the higher frequency of interaction between roots and fungal propagules. In a second experiment, large-potted AM plants showed a greater tolerance to water deficit than non-AM control plants; however, this mycorrhizal effect was not detected among small-potted plants. We conclude that careful consideration should be made toward design parameters to limit result biases and ultimately facilitate comparison of findings between studies.
机译：为了测试盆栽试验设计的目的，我们对“矮”向日葵品种和丛枝菌根（AM）真菌进行了两次温室研究，以确定盆栽大小和接种量如何影响植物生长和AM共生。正如预测的那样，大盆栽植物的整体生物量和根部定植要比小盆栽植物更大，这归因于较大的“可生根”量。此外，与在分散接种基质中生长的植物相比，在高密度接种基质带中生长的植物显示出较高的真菌囊泡（脂质储存位点），表明其根部定植水平更高。这可能是由于根与真菌繁殖体之间相互作用的频率更高。在第二个实验中，大盆栽AM植株比非AM对照植株对水分缺乏的耐受性更高。但是，在小盆栽植物中未发现这种菌根作用。我们得出结论，应该对设计参数进行仔细考虑，以限制结果偏差并最终促进研究之间的发现比较。

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