Russell Margaret, Řezáčová Veronika, Miller Kirby Shane, Nardi Wynter Helene, Brown Morgan, Weremijewicz Joanna
Department of Biology, North Central College, 30 N Brainard St., Naperville, IL, 60540-5461, U.S.A.
Czech Agrifood Research Center, Drnovská 507, Prague 6, Czech Republic.
Mycorrhiza. 2025 Feb 3;35(1):8. doi: 10.1007/s00572-025-01181-z.
Under drought conditions, arbuscular mycorrhizal (AM) fungi may improve plant performance by facilitating the movement of water through extensive hyphal networks. When these networks interconnect neighboring plants in common mycorrhizal networks (CMNs), CMNs are likely to partition water among many individuals. The consequences of CMN-mediated water movement for plant interactions, however, are largely unknown. We set out to examine CMN-mediated interactions among Andropogon gerardii seedlings in a target-plant pot experiment, with watering (watered or long-term drought) and CMN status (intact or severed) as treatments. Intact CMNs improved the survival of seedlings under drought stress and mediated positive, facilitative plant interactions in both watering treatments. Watering increased mycorrhizal colonization rates and improved P uptake, particularly for large individuals. Under drought conditions, improved access to water most likely benefited neighboring plants interacting across CMNs. CMNs appear to have provided the most limiting resource within each treatment, whether P, water, or both, thereby improving survival and growth. Neighbors near large, photosynthate-fixing target plants likely benefited from their establishment of extensive hyphal networks that could access water and dissolved P within soil micropores. In plant communities, CMNs may be vital during drought, which is expected to increase in frequency, intensity, and length with climate change.
在干旱条件下，丛枝菌根（AM）真菌可能通过促进水分在广泛的菌丝网络中移动来改善植物生长状况。当这些网络在共同菌根网络（CMN）中连接相邻植物时，CMN很可能会在许多个体之间分配水分。然而，CMN介导的水分移动对植物相互作用的影响在很大程度上尚不清楚。我们开展了一项目标植物盆栽实验，以浇水情况（浇水或长期干旱）和CMN状态（完整或切断）作为处理因素，来研究CMN介导的糙毛须芒草幼苗之间的相互作用。完整的CMN提高了干旱胁迫下幼苗的存活率，并在两种浇水处理中都介导了积极、促进性的植物相互作用。浇水增加了菌根定殖率并改善了磷的吸收，对大型个体尤其如此。在干旱条件下，更好地获取水分最有可能使通过CMN相互作用的相邻植物受益。CMN似乎在每种处理中都提供了最具限制性的资源，无论是磷、水分还是两者，从而提高了存活率和生长。靠近大型光合固碳目标植物的邻居可能受益于其建立的广泛菌丝网络，这些网络可以获取土壤微孔中的水分和溶解的磷。在植物群落中，CMN在干旱期间可能至关重要，预计随着气候变化，干旱的频率、强度和持续时间都会增加。
