Abstract
The effects of the interactions of soil filamentous fungi (including saprotrophic, mycorrhizal and endophytic fungi) on several morphological and physiological parameters of Norway spruce seedlings [Picea abies (L.) Karst.] were studied in a pot experiment. Both mycorrhizal variants (Hebeloma bryogenes and Cadophora finlandica) were slightly inhibited with respect to the accumulation of aboveground biomass. However, these variants exhibited significantly improved foliar content of N, P, and Ca (H. bryogenes variant also K), compared to controls. The presence of the saprotrophic fungus Setulipes androsaceus attenuated the positive effect of mycorrhizal fungi on Ca, P, and K content, but did not reduce the positive effect of mycorrhizal fungi on the N content of the seedlings’ needles. Raman spectroscopy revealed that both mycorrhizal fungi increased the foliar content of carotenoids compared to the controls, but the effect diminished in the presence of S. androsaceus. In contrast, in the presence of the dark septate endophyte Phialocephala fortinii, needles exhibited significantly higher wax content and lower carotenoid content compared to the mycorrhizal variants. The presence of the saprotrophic isolate Serpula himantoides resulted in a decrease in needle waxes in comparison to controls. The needles’ carotenoid concentration was positively correlated with the levels of needle nutrients (N, P, K, Ca, Mg), while correlation of needle nutrients (N, P) with the needle wax concentration was negative. We conclude that not only individual fungi but also their interactions profoundly affect the nutrition and needle composition of Norway spruce seedlings.
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Financial support from the Grant Agency of the Czech Republic (grants GA203/05/0697 and GA206/05/0269), the Ministry of Education, Youth and Sports of the Czech Republic (grant MSM 6046137307 and Grant Agency of the Academy of Sciences of the Czech Republic (grant AV0Z60050516) is gratefully acknowledged.
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468_2009_330_MOESM1_ESM.jpg
Spruce seedlings’ root tip cross-sections (stained by aniline blue): a, b, root tips of seedlings inoculated by Hebeloma bryogenes (M2 and M2S variants) with developed ectomycorrhizal symbiosis (red arrow marks hyphal mantle and red arrowheads mark Hartig net); c, d, root tips of seedlings inoculated by Cadophora finlandica (E2 and E2S variants) with developed ectomycorrhizal symbiosis (red arrow marks hyphal mantle and red arrowheads mark Hartig net); e, f, root tips of seedlings inoculated by Phialocephala fortinii (E1 and E1S variants) developed DSE association (dashed red arrows mark sclerotia, red arrowheads mark intercellular hyphae and doubled red arrows mark intracellular hyphae). Scale = 20 μm (JPG 1374 kb)
468_2009_330_MOESM2_ESM.jpg
Selected Raman spectra measured for the needles of Norway spruce seedlings. Four major bands are indicated, corresponding to water, waxes and carotenoids. Needle cuticular waxes are characterized by bands corresponding to the aliphatic moiety (bands at 2882, 2845 and about 1456 cm-1). Two bands at about 1530 and 1160 cm-1 correspond to the carotenoids, while the relatively weak but broad band at 3220 cm-1 is attributable to the water stretching vibration modes. Spectra of mycorrhizal (M2-1v-A), endophytic (E1-6v-B) and saprotrophic (M1-3v-B) variants are shown (JPG 559 kb)
468_2009_330_MOESM3_ESM.jpg
Intensity (peak area) of C-H Raman spectral bands corresponding to spruce needle waxes. The intensities of experimental variants were derived from individual measured spectra and averaged per pot. Data are expressed as mean ± S.E.M (n=6). Experimental variants: K, control; S, S. androsaceus; M1, S. himantoides; E1, P. fortinii; E2, C. finlandica; XS, variant with the simultaneous presence of X and S. androsaceus. Different letters denote significant differences (p<0.05) for Fungal factor I (letters above brackets) and separately for variants with the absence or the presence of S. androsaceus (letters started by p or x, respectively) (JPG 960 kb)
468_2009_330_MOESM4_ESM.jpg
Intensity (peak area) of C=C Raman spectral band corresponding to spruce needle carotenoids. The intensities of experimental variants were derived from individual measured spectra and averaged per pot. Data are expressed as mean ± S.E.M (n=6). Experimental variants: K, control; S, S. androsaceus; M1, S. himantoides; E1, P. fortinii; E2, C. finlandica; XS, variant with the simultaneous presence of X and S. androsaceus. Different letters denote significant differences (p<0.05) for Fungal factor I (letters above brackets) and separately for variants with the absence or the presence of S. androsaceus (letters started by p or x, respectively) (JPG 751 kb)
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Mrnka, L., Tokárová, H., Vosátka, M. et al. Interaction of soil filamentous fungi affects needle composition and nutrition of Norway spruce seedlings. Trees 23, 887–897 (2009). https://doi.org/10.1007/s00468-009-0330-3
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DOI: https://doi.org/10.1007/s00468-009-0330-3