Abstract
Aims
Legacy effects arising from grazing may alter the effect of plant-soil feedback (PSF), plant-phyllosphere feedback (PPF) and/or transgenerational plasticity on plant performance. Understanding how effects from these mechanisms are influenced by grazing can help predict grassland production and ecosystem dynamics.
Methods
Plant clonal buds and shoot materials of Leymus chinensis (a clonal grass species widely distributed across the eastern Eurasian Steppes), sterilised and non-sterilised soils were collected from sites subjected to long-term grazing or no grazing. We then conducted a series of studies to determine the presence and context-dependency of (1) PSF, (2) PPF and (3) clonal transgenerational plasticity mechanisms on long-term grazing by measuring plant above/belowground biomass, height and density.
Results
Inoculation with soil biota conditioned by L. chinensis from grazed sites increased root growth by 83.99% (positive PSF), but not inoculum from ungrazed sites (neutral PSF). Shoot inocula from grazed and ungrazed sites had similar positive effects on plant growth (positive PPF). Clonal offspring from grazed sites showed transgenerational trait plasticity in terms of herbivory-avoidance (21.24% height reduction and 84.62% tiller density increase), but aboveground production was unaffected. Additionally, grazed field plots with a year of grazing exclusion showed similar plant heights and aboveground biomass as ungrazed plots, which indicated short-term transgenerational trait plasticity.
Conclusions
Positive PSF and short-term clonal transgenerational plasticity of L. chinensis depended on past grazing activity, and together with positive PPF, can aid their recovery and fitness in subsequent growing seasons. Our findings highlighted context-dependent plant–microorganism interactions and trans-generational feedback of plants in response to grazing.
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Funding
Funding was supported by the Natural Science Foundation (NSF) of China (32071882; 31702161), Inner Mongolia Science and Technology Project (2021GG0055; 2021ZY0039; 2021GG0415), the Open Project Program of the Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau (Inner Mongolia University); Qinghai Science & Technology Project (2020-ZJ-Y03). We thank Qingshan Zhao, Junjie Duan, Zhuo Bai and Fang Mu for their assistance in the experiments.
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X.L. K.J. and Y.L. conceived the ideas and designed methodology; X.L., S.S. and H.S. collected the data; X.L. K.P., K.J. and Y.L. analyzed the data; X.L., K.P., K.J. and Y.L. led the writing of the manuscript. All authors contributed critically to the drafts and gave final approval for publication.
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Li, X., Png, G.K., Sun, S. et al. Positive microbial legacy and short-term clonal plasticity aid grazing tolerance of a widespread grass species. Plant Soil 473, 291–303 (2022). https://doi.org/10.1007/s11104-021-05281-5
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DOI: https://doi.org/10.1007/s11104-021-05281-5