Du Ewei, Chen Yaping, Li Yahong, Sun Zhongxiang, Gui Furong
State Key Laboratory for Conservation and Utilization of Bioresources in Yunnan, College of Plant Protection, Yunnan Agricultural University, Kunming, China.
Yunnan Plant Protection and Quarantine Station, Kunming, China.
Front Plant Sci. 2022 Jun 14;13:882255. doi: 10.3389/fpls.2022.882255. eCollection 2022.
The rhizospheric microbial community affects the population establishment of invasive plants in introduced areas, among which has numerous functions in promoting plant growth. This study isolated and enriched the community in the rhizospheric soil of the invasive plant and the native accompanying plant . The effects of these rhizospheric communities on the growth and competition of and were evaluated in pot experiments. The results showed that the number and diversity of in the rhizospheric soil of were higher than those of (: 122 strains in soil, 16 taxa; : 88 strains in soil, 9 taxa). After inoculation of in a pot experiment, , and were accumulated in the rhizospheric of , which significantly increased the nitrate nitrogen (NO -N) content in the soil and the total carbon and nitrogen concentrations in in the mixed treatment. The selective accumulation of enhanced the competitive advantage of over the native accompanying plant; the corrected index of relative competition intensity of . -inoculated reached double that of the uninoculated treatment, and the growth of native plants was greatly suppressed under mixed planting. Our study confirmed that invasion of can lead to the accumulation of specific taxa in the rhizospheric soil, which in turn can increase the competitive advantage of .
根际微生物群落影响外来入侵植物在引入地的种群建立，其中根际微生物群落在促进植物生长方面具有多种功能。本研究从入侵植物和本地伴生植物的根际土壤中分离并富集了根际微生物群落。通过盆栽实验评估了这些根际微生物群落对入侵植物和本地伴生植物生长及竞争的影响。结果表明，入侵植物根际土壤中根际微生物的数量和多样性高于本地伴生植物（入侵植物：土壤中122株，16个分类单元；本地伴生植物：土壤中88株，9个分类单元）。在盆栽实验中接种入侵植物根际微生物后，入侵植物根际积累了铵态氮、硝态氮和总碳，这显著增加了混合处理土壤中的硝态氮（NO₃-N）含量以及入侵植物地上部分总碳和总氮浓度。根际微生物的选择性积累增强了入侵植物相对于本地伴生植物的竞争优势；接种入侵植物根际微生物的入侵植物相对竞争强度校正指数达到未接种处理的两倍，混种条件下本地植物的生长受到极大抑制。我们的研究证实，入侵植物的入侵可导致根际土壤中特定根际微生物分类单元的积累，进而增加入侵植物的竞争优势。
