Sun Dasheng, Yang Xueping, Wang Yi, Fan Yu, Ding Pengcheng, Song Xi'E, Yuan Xiangyang, Yang Xuefang
College of Resources and Environment, Shanxi Agricultural University, Taigu, 030801, China.
College of Agriculture, Shanxi Agricultural University, Taigu, 030801, China.
New Phytol. 2022 Nov;236(4):1487-1496. doi: 10.1111/nph.18435. Epub 2022 Aug 30.
Mutualistic interactions with arbuscular mycorrhizal fungi (AMF) greatly affect the outcome of plant-plant competition, especially for invasive plants competing against native plants. We examined the effects of AMF on the competition between invasive Asteraceae plants and the phylogenetically related native plants. We compared the performance of seven invasive Asteraceae plants from different genera with that of their phylogenetically related native counterparts in response to AMF in monocultures and mixed cultures. We investigated how interactions with AMF impact the competition between Asteraceae relatives. Total biomass increased with AMF colonization in both invasive and native plants. Arbuscular mycorrhizal fungi improved the competitiveness of invasive plants, but decreased that of native plants. Competition increased the shoot nitrogen, phosphorus and root myristic acid concentrations and relative expression of fatty acid transporter genes (RiFAT1 and RiFAT2) in AMF-colonized invasive plants, but decreased those in AMF-colonized native plants. Structural equation models indicated that the presence of AMF increased the uptake of phosphorus, but not nitrogen, by invasive plants, which probably provided more myristic acids to symbiotic AMF in return. These results suggest that invasive Asteraceae plants have greater mutualistic interactions with AMF than their phylogenetically related native counterparts, potentially contributing to invasion success.
与丛枝菌根真菌（AMF）的互利共生相互作用极大地影响植物间竞争的结果，尤其是对于入侵植物与本地植物之间的竞争。我们研究了AMF对入侵菊科植物与其系统发育相关的本地植物之间竞争的影响。我们比较了来自不同属的七种入侵菊科植物与其系统发育相关的本地对应植物在单作和混作条件下对AMF的响应表现。我们调查了与AMF的相互作用如何影响菊科近缘种之间的竞争。在入侵植物和本地植物中，总生物量均随着AMF定殖而增加。丛枝菌根真菌提高了入侵植物的竞争力，但降低了本地植物的竞争力。竞争增加了AMF定殖的入侵植物地上部氮、磷和根部肉豆蔻酸浓度以及脂肪酸转运蛋白基因（RiFAT1和RiFAT2）的相对表达，但降低了AMF定殖的本地植物中的这些指标。结构方程模型表明，AMF的存在增加了入侵植物对磷的吸收，但没有增加对氮的吸收，这可能反过来为共生AMF提供了更多的肉豆蔻酸。这些结果表明，入侵菊科植物与AMF的互利共生相互作用比其系统发育相关的本地对应植物更强，这可能有助于入侵成功。
