Effect of controlled inoculation with specific mycorrhizal fungi from the urban environment on growth and physiology of containerized shade tree species growing under different water regimes |
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Authors: | Alessio Fini Piero Frangi Gabriele Amoroso Riccardo Piatti Marco Faoro Chandra Bellasio Francesco Ferrini |
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Institution: | (1) Department of Plant, Soil and Environmental Science, University of Florence, viale delle Idee 30, 50019 Sesto Fiorentino (FI), Italy;(2) Centro MiRT, Fondazione Minoprio, viale Raimondi 54, 22070 Vertemate con Minoprio (CO), Italy |
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Abstract: | The aim of this work was to evaluate the effects of selected mycorrhiza obtained in the urban environment on growth, leaf
gas exchange, and drought tolerance of containerized plants growing in the nursery. Two-year-old uniform Acer campestre L., Tilia cordata Mill., and Quercus robur L. were inoculated with a mixture of infected roots and mycelium of selected arbuscular (maple, linden) and/or ectomycorrhiza
(linden, oak) fungi and grown in well-watered or water shortage conditions. Plant biomass and leaf area were measured 1 and
2 years after inoculation. Leaf gas exchange, chlorophyll fluorescence, and water relations were measured during the first
and second growing seasons after inoculation. Our data suggest that the mycelium-based inoculum used in this experiment was
able to colonize the roots of the tree species growing in the nursery. Plant biomass was affected by water shortage, but not
by inoculation. Leaf area was affected by water regime and, in oak and linden, by inoculation. Leaf gas exchange was affected
by inoculation and water stress. V
cmax and J
max were increased by inoculation and decreased by water shortage in all species. F
v/F
m was also generally higher in inoculated plants than in control. Changes in PSII photochemistry and photosynthesis may be
related to the capacity of inoculated plants to maintain less negative leaf water potential under drought conditions. The
overall data suggest that inoculated plants were better able to maintain physiological activity during water stress in comparison
to non-inoculated plants. |
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