A commercial arbuscular mycorrhizal inoculum increases root colonization across wheat cultivars but does not increase assimilation of mycorrhiza-acquired nutrients.
A commercial arbuscular mycorrhizal inoculum increases root colonization across wheat cultivars but does not increase assimilation of mycorrhiza-acquired nutrients.
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商业杂草菌根接种物可以增加小麦品种的根定植，但不会增加菌根获得的营养物质的同化。
DOI：
10.1002/ppp3.10094
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发表时间：
2021-09
期刊：
影响因子：
--
通讯作者：
Field KJ
中科院分区：
文献类型：
--
作者：
Elliott AJ;Daniell TJ;Cameron DD;Field KJ
由于径流污染、高二氧化碳排放和收益递减，为维持作物产量而大量使用化学肥料是不可持续的。由于能源成本的上升和磷矿资源的减少，化肥的获取将在未来受到限制。越来越多的公司生产和销售丛枝菌根真菌（AMF）接种剂，旨在通过促进丛枝菌根对作物养分的吸收来帮助减少肥料的使用。然而，他们的成功参差不齐。在这里，我们介绍了一种市售的AMF接种剂在增加AMF根定植和真菌对植物营养吸收的贡献方面的功效，这是不断增长的AMF接种剂工业中的关键考虑因素。耕地农业需要可持续的解决方案，以减少对大量营养肥料投入的依赖，同时继续提高作物产量。通过利用丛枝菌根共生，有可能在没有额外投入的情况下改善作物的营养吸收和生长，尽管商业上可获得的菌根接种在农业系统中的有效性仍然存在争议。利用稳定和放射性同位素示踪，在非无菌的农业土壤中，在添加或不添加商业菌根接种剂的情况下，对丛枝菌根真菌和三个现代小麦品种之间的碳-对-营养交换进行了量化。虽然接种量对地上植物生物量没有影响，但丛枝菌根真菌的根定殖增加，群落结构发生变化。接种使所有小麦品种的磷吸收量增加了30%，尽管这种增加不是直接归因于菌根真菌。不同小麦品种间共生体间的碳-养分交换存在显著差异。接种后植物组织磷的增加可能是由于接种引起根际微生物群落组成和/或养分循环的变化。我们的数据有助于越来越多的共识，即菌根接种剂可以在未来的可持续粮食生产系统中发挥作用。由于径流污染、高二氧化碳排放和产量回报递减，为维持作物产量而大量使用化学肥料是不可持续的。由于能源成本的上升和磷矿资源的减少，化肥的获取将在未来受到限制。越来越多的公司生产和销售丛枝菌根真菌（AMF）接种剂，旨在通过促进丛枝菌根对作物养分的吸收来帮助减少肥料的使用。然而，他们的成功参差不齐。在这里，我们介绍了一种市售的AMF接种剂在增加AMF根定植和真菌对植物营养吸收的贡献方面的功效，这是不断增长的AMF接种剂工业中的关键考虑因素。
Production and heavy application of chemical‐based fertilizers to maintain crop yields is unsustainable due to pollution from run‐off, high CO2 emissions, and diminishing yield returns. Access to fertilizers will be limited in the future due to rising energy costs and dwindling rock phosphate resources. A growing number of companies produce and sell arbuscular mycorrhizal fungal (AMF) inoculants, intended to help reduce fertilizer usage by facilitating crop nutrient uptake through arbuscular mycorrhizas. However, their success has been variable. Here, we present information about the efficacy of a commercially available AMF inoculant in increasing AMF root colonization and fungal contribution to plant nutrient uptake, which are critical considerations within the growing AMF inoculant industry. Arable agriculture needs sustainable solutions to reduce reliance on large inputs of nutrient fertilizers while continuing to improve crop yields. By harnessing arbuscular mycorrhizal symbiosis, there is potential to improve crop nutrient assimilation and growth without additional inputs, although the efficacy of commercially available mycorrhizal inocula in agricultural systems remains controversial. Using stable and radioisotope tracing, carbon‐for‐nutrient exchange between arbuscular mycorrhizal fungi and three modern cultivars of wheat was quantified in a non‐sterile, agricultural soil, with or without the addition of a commercial mycorrhizal inoculant. While there was no effect of inoculum addition on above‐ground plant biomass, there was increased root colonization by arbuscular mycorrhizal fungi and changes in community structure. Inoculation increased phosphorus uptake across all wheat cultivars by up to 30%, although this increase was not directly attributable to mycorrhizal fungi. Carbon‐for‐nutrient exchange between symbionts varied substantially between the wheat cultivars. Plant tissue phosphorus increased in inoculated plants potentially because of changes induced by inoculation in microbial community composition and/or nutrient cycling within the rhizosphere. Our data contribute to the growing consensus that mycorrhizal inoculants could play a role in sustainable food production systems of the future. Summary Production and heavy application of chemical‐based fertilizers to maintain crop yields is unsustainable due to pollution from run‐off, high CO2 emissions, and diminishing yield returns. Access to fertilizers will be limited in the future due to rising energy costs and dwindling rock phosphate resources. A growing number of companies produce and sell arbuscular mycorrhizal fungal (AMF) inoculants, intended to help reduce fertilizer usage by facilitating crop nutrient uptake through arbuscular mycorrhizas. However, their success has been variable. Here, we present information about the efficacy of a commercially available AMF inoculant in increasing AMF root colonization and fungal contribution to plant nutrient uptake, which are critical considerations within the growing AMF inoculant industry.
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5.2
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