Root-associated microbiota drive phytoremediation strategies to lead of Sonchus Asper (L.) Hill as revealed by intercropping-induced modifications of the rhizosphere microbiome
2021
Mei, Xinyue | Wang, Ying | Li, Zuran | Larousse, Marie | Péré, Arthur | Rocha, Martine Da | Zhan, Fangdong | He, Yongmei | Pu, Linlong | Panabières, Franck | Zu, Yanqun | Yunnan Agricultural University | Institut Sophia Agrobiotech (ISA) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Côte d'Azur (UniCA) | Yunnan Key Research and Development Project2019BC001-04National Key Research and Development Program of China2018YFC1802603National Natural Science Foundation of China (NSFC)41867055Appeared in source as:National Natural Science Foundation of China31560163Appeared in source as:National Natural Science Foundation of ChinaYunnan Agricultural Foundation Projects2017FG001052China Scholarship CouncilINRAE fellowship (Plant Health and Environment Department)
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Show more [+] Less [-]English. Intercropping or assistant endophytes promote phytoremediation capacities of hyperaccumulators and enhance their tolerance to heavy metal (HM) stress. Findings from a previous study showed that intercropping the hyperaccumulator Sonchus asper (L.) Hill grown in HM-contaminated soils with maize improved the remediating properties and indicated an excluder-to-hyperaccumulator switched mode of action towards lead. In the current study, RNA-Seq analysis was conducted on Sonchus roots grown under intercropping or monoculture systems to explore the molecular events underlying this shift in lead sequestering strategy. The findings showed that intercropping only slightly affects S. asper transcriptome but significantly affects expression of root-associated microbial genomes. Further, intercropping triggers significant reshaping of endophytic communities associated with a ‘root-to-shoot’ transition of lead sequestration and improved phytoremediation capacities of S. asper . These findings indicate that accumulator activities of a weed are partially attributed to the root-associated microbiota, and a complex network of plant–microbe-plant interactions shapes the phytoremediation potential of S. asper . Analysis showed that intercropping may significantly change the structure of root-associated communities resulting in novel remediation properties, thus providing a basis for improving phytoremediation practices to restore contaminated soils.
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