Removal of soil biota alters soil feedback effects on plant growth and defense chemistry

The New Phytologist
Minggang WangT Martijn Bezemer

Abstract

We examined how the removal of soil biota affects plant-soil feedback (PSF) and defense chemistry of Jacobaea vulgaris, an outbreak plant species in Europe containing the defense compounds pyrrolizidine alkaloids (PAs). Macrofauna and mesofauna, as well as fungi and bacteria, were removed size selectively from unplanted soil or soil planted with J. vulgaris exposed or not to above- or belowground insect herbivores. Wet-sieved fractions, using 1000-, 20-, 5- and 0.2-μm mesh sizes, were added to sterilized soil and new plants were grown. Sieving treatments were verified by molecular analysis of the inocula. In the feedback phase, plant biomass was lowest in soils with 1000- and 20-μm inocula, and soils conditioned with plants gave more negative feedback than without plants. Remarkably, part of this negative PSF effect remained present in the 0.2-μm inoculum where no bacteria were present. PA concentration and composition of plants with 1000- or 20-μm inocula differed from those with 5- or 0.2-μm inocula, but only if soils had been conditioned by undamaged plants or plants damaged by aboveground herbivores. These effects correlated with leaf hyperspectral reflectance. We conclude that size-selective removal of soil biota altered P...Continue Reading

References

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Citations

Feb 6, 2020·Journal of Chemical Ecology·Martine HubertyT Martijn Bezemer
Nov 21, 2020·Trends in Plant Science·Rutger A Wilschut, Stefan Geisen
Mar 2, 2021·Frontiers in Plant Science·Fangcuo Qin, Shixiao Yu
May 10, 2021·Current Opinion in Plant Biology·Rémi PélissierJean-Benoit Morel
Aug 21, 2021·The New Phytologist· InderjitT Martijn Bezemer

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Methods Mentioned

BETA
environmental stresses
PCR
PCRs
electrophoresis
PCA

Software Mentioned

asslynx
PERMANOVA
R
V S pec P ro
canoco
FUNGuild

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