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首页> 美国卫生研究院文献>Plant Physiology >Interactions between Nitrogen Fixation Mycorrhizal Colonization and Host-Plant Growth in the Phaseolus-Rhizobium-Glomus Symbiosis
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Interactions between Nitrogen Fixation Mycorrhizal Colonization and Host-Plant Growth in the Phaseolus-Rhizobium-Glomus Symbiosis

机译：菜豆-根瘤菌-glolomus共生中固氮菌根定植和寄主植物生长之间的相互作用

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Bean (Phaseolus vulgaris L. cv. Dwarf) roots were inoculated with Rhizobium phaseoli and colonized by the vesicular-arbuscular mycorrhizal (VAM) fungus Glomus fasciculatum Gerd. and Trappe or left uncolonized as controls. The symbiotic associations were grown in an inert substrate using 0, 25, 50, 100, or 200 milligrams hydroxyapatite (HAP) (Ca10[PO4]6[OH]2) per pot as a P amendment. Plant and nodule dry weights and nodule activity increased for both VAM and control plants with increasing P availability, but values for VAM plants were significantly lower in all parameters than for controls. Inhibition of growth and of N2 fixation in VAM plants was greatest at the lowest and highest P regimes. It was smallest at 50 milligrams HAP, where available P at harvest (7 weeks after planting) was 5 micrograms P per gram substrate. At this level of P availability, the association apparently benefited from increased P uptake by the fungal endophyte. Percent P values for shoots, roots, and nodules did not differ significantly (p > 0.05) between VAM and control plants. The extent of colonization, fungal biomass, and the fungus/association dry weight ratio increased several fold as HAP was increased from 0 to 200 milligrams. It is concluded that intersymbiont competition for P and photosynthate was the primary cause for the inhibition of growth, nodulation, and nodule activity in VAM plants. Impaired N2 fixation resulted in N stress which contributed to inhibition of host plant growth at all levels of P availability.
机译：用菜豆根瘤菌（Rhizobium phaseoli）接种豆（菜豆（Phaseolus vulgaris L. cv。Dwarf））的根，并通过水泡-丛枝菌根（VAM）真菌Glosus fasciculatum Gerd定植。和Trappe或不加殖民地作为对照。使用每盆0、25、50、100或200毫克的羟基磷灰石（HAP）（Ca10 [PO4] 6 [OH] 2）作为P改良剂，在惰性基质中生长共生缔合。 V和对照植株的植株和根瘤干重以及根瘤活性均随P利用率的增加而增加，但在所有参数上，VAM植株的值均显着低于对照。在最低磷和最高磷条件下，VAM植物的生长和N2固定抑制作用最大。它最小为50毫克HAP，收获时（种植后7周）的有效磷为每克底物5微克P。在此水平的磷可用性下，该关联显然受益于真菌内生菌对磷的吸收增加。在VAM和对照植物之间，芽，根和根瘤的P百分比百分数无显着差异（p> 0.05）。随着HAP从0毫克增加到200毫克，定殖程度，真菌生物量和真菌/缔合干重比增加了几倍。结论是共生体之间竞争P和光合产物是抑制VAM植物生长，结节和结节活性的主要原因。 N 2固定受损导致N胁迫，在所有水平的P利用率下，N抑制宿主植物的生长。

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