Nutrient and Microbiome-Mediated Plant–Soil Feedback in Domesticated and Wild Andropogoneae: Implications for Agroecosystems
2023
Amanda Quattrone | Yuguo Yang | Pooja Yadav | Karrie A. Weber | Sabrina E. Russo
Plants influence the abiotic and biotic environment of the rhizosphere, affecting plant performance through plant–soil feedback (PSF). We compared the strength of nutrient and microbe-mediated PSF and its implications for plant performance in domesticated and wild grasses with a fully crossed greenhouse PSF experiment using four inbred maize genotypes (<i>Zea mays</i> ssp. <i>mays b58</i>, <i>B73</i>-<i>wt</i>, <i>B73</i>-<i>rth3</i>, and <i>HP301</i>), teosinte (<i>Z. mays</i> ssp. <i>parviglumis</i>), and two wild prairie grasses (<i>Andropogon gerardii</i> and <i>Tripsacum dactyloides</i>) to condition soils for three feedback species (maize <i>B73</i>-<i>wt</i>, teosinte, <i>Andropogon gerardii</i>). We found evidence of negative PSF based on growth, phenotypic traits, and foliar nutrient concentrations for maize <i>B73</i>-<i>wt</i>, which grew slower in maize-conditioned soil than prairie grass-conditioned soil. In contrast, teosinte and <i>A. gerardii</i> showed few consistent feedback responses. Both rhizobiome and nutrient-mediated mechanisms were implicated in PSF. Based on 16S rRNA gene amplicon sequencing, the rhizosphere bacterial community composition differed significantly after conditioning by prairie grass and maize plants, and the final soil nutrients were significantly influenced by conditioning, more so than by the feedback plants. These results suggest PSF-mediated soil domestication in agricultural settings can develop quickly and reduce crop productivity mediated by PSF involving changes to both the soil rhizobiomes and nutrient availability.
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