
Figure 1
Degree of root colonization expressed in % by bacteria, taking into account the research area (G, M, W), the variant (2, 3, 4, 5, 6), the season (autumn, spring) and year of evaluation (2017, 2018) for samples taken from Corylus avellana roots
Table 1
Average values of hydrothermal coefficient K and the average sum of precipitation for months IV–X at the nearest measuring stations in Kielce and Cracow in 2016–2018
| Station name | K | Total precipitation by month | Years | |
|---|---|---|---|---|
| IV–X | I–XII | |||
| Kielce | 1.44 | 378.6 | 619.5 | 2016 |
| Cracow | 1.95 | 553.6 | 745.3 | |
| Kielce | 2.27 | 548.9 | 731.8 | 2017 |
| Cracow | 2.11 | 545.9 | 702.3 | |
| Kielce | 0.95 | 340.1 | 486.7 | 2018 |
| Cracow | 1.25 | 459.0 | 568.7 | |
Table 2
Percentage of bacteria of the dominant genera by season (S – spring; A – autumn) of the year (2017, 2018)
| Genus | 2017 | 2018 | ||
|---|---|---|---|---|
| S | A | S | A | |
| Bacillus | 6.8 | 6.8 | 3.4 | 11.2 |
| Erwinia | 9.6 | 0.0 | 3.4 | 3.4 |
| Pseudomonas | 20.5 | 32.9 | 2.2 | 14.6 |
| Rahnella | 1.4 | 1.4 | 30.3 | 0.0 |
| Serratia | 4.1 | 4.1 | 22.5 | 0.0 |
| Other | 6.8 | 5.5 | 6.7 | 2.2 |
Table 3
Percentage of bacteria of dominant genera, indicating variant (T – truffle; C– control) obtained by Sanger sequencing. The numbers in bold indicate the presence of a particular genus of bacteria in a particular sample
| Genus | 2017 | 2018 | ||
|---|---|---|---|---|
| T | C | T | C | |
| Bacillus | 6.8 | 6.8 | 6.7 | 7.9 |
| Pseudomonas | 32.9 | 20.5 | 11.2 | 3.4 |
| Erwinia | 8.2 | 1.4 | 5.6 | – |
| Rahnella | – | 4.1 | 18.0 | 11.2 |
| Serratia | 6.8 | 1.4 | 9.0 | 5.6 |
| Brevibacterium | 1.4 | – | – | – |
| Enterobacter | 1.4 | 1.4 | 1.1 | – |
| Viridibacillus | 1.4 | 1.4 | – | – |
| Microbacterium | – | 1.4 | – | – |
| Pantoea | – | 1.4 | – | – |
| Bradyrhizobium | – | – | 2.2 | – |
| Acinetobacter | – | – | 1.1 | – |
| Methylobacterium | – | – | – | 1.1 |
| Viridibacillus | – | – | – | 1.1 |
Table 4
Alpha biodiversity index values for Chao, Faith’s, OTUs, Shannon’s, Heip’s and Simpson’s indices for selected samples representing sites W, G and M
| Sample | Chao | Faith’s | OTU | Shannon’s | Heip’s | Simpson’s |
|---|---|---|---|---|---|---|
| W1 | 188.00 | 13.77 | 188.00 | 7.12 | 0.74 | 0.99 |
| W2 | 178.00 | 13.53 | 178.00 | 7.09 | 0.76 | 0.99 |
| W4 | 362.00 | 14.56 | 362.00 | 7.78 | 0.61 | 0.99 |
| W5 | 272.00 | 13.36 | 272.00 | 7.43 | 0.63 | 0.99 |
| G1 | 246.00 | 13.44 | 246.00 | 7.49 | 0.73 | 0.99 |
| G2 | 120.00 | 12.74 | 120.00 | 6.51 | 0.76 | 0.99 |
| G3 | 233.00 | 15.23 | 233.00 | 7.25 | 0.65 | 0.99 |
| G4 | 184.00 | 12.87 | 184.00 | 6.98 | 0.68 | 0.99 |
| G5 | 239.00 | 13.73 | 239.00 | 7.46 | 0.74 | 0.99 |
| G6 | 214.00 | 13.48 | 214.00 | 7.23 | 0.70 | 0.99 |
| M1 | 162.00 | 12.44 | 162.00 | 6.35 | 0.50 | 0.98 |
| M2 | 245.00 | 15.21 | 245.00 | 7.50 | 0.74 | 0.99 |
| M3 | 252.00 | 14.80 | 252.00 | 7.53 | 0.73 | 0.99 |
| M4 | 203.00 | 13.38 | 203.00 | 7.14 | 0.69 | 0.99 |
| M5 | 200.00 | 13.54 | 200.00 | 7.07 | 0.67 | 0.99 |
| M6 | 121.00 | 11.12 | 121.00 | 6.48 | 0.73 | 0.98 |

Figure 2
PcoA distance plots: A – Weighted UniFrac and B– unweighted UniFrac

Figure 3
PcoA distance plot – Bray-Curtis dissimilarity

Figure 4
PcoA distance plot – Jaccard index

Figure 5
Boxplot charts with Bray-Curtis (A), Unweighted (B), Jaccard (C), and Weighted (D) indicators for WC sample
| OTU ID (genus) | VARIANT | |
|---|---|---|
| T | C | |
| 1 | 2 | 3 |
| Acidicapsa | 0 | 834 |
| Acidipila | 0 | 1813 |
| Acidisphaera | 0 | 1306 |
| Acidobacterium | 0 | 759 |
| Acidocella | 0 | 35 |
| Acidothermus | 0 | 184 |
| Acidovorax | 0 | 60 |
| Actinoallomurus | 0 | 117 |
| Actinocrinis | 0 | 473 |
| Actinokineospora | 0 | 79 |
| Actinospica | 0 | 717 |
| Actinosynnema | 0 | 206 |
| Afipia | 262 | 0 |
| Agromyces | 90 | 0 |
| Albimonas | 29 | 0 |
| Aliidongia | 0 | 955 |
| Allokutzneria | 0 | 54 |
| Alteromonas | 37 | 0 |
| Amaricoccus | 55 | 0 |
| Angustibacter | 0 | 296 |
| Arcobacter | 38 | 0 |
| Asaia | 48 | 0 |
| Azoarcus | 54 | 0 |
| Azospirillum | 0 | 39 |
| Bacillus | 31 | 0 |
| Baekduia | 145 | 0 |
| Bauldia | 25 | 0 |
| Bdellovibrio | 0 | 32 |
| Blastococcus | 76 | 0 |
| Blastomonas | 0 | 87 |
| Bradyrhizobium | 0 | 153 |
| Brumimicrobium | 0 | 83 |
| Bryobacter | 0 | 297 |
| Bryocella | 0 | 112 |
| Caenimonas | 76 | 0 |
| Caldicellulosiruptor | 0 | 102 |
| Calditerricola | 0 | 14 |
| Catelliglobosispora | 0 | 69 |
| Catenulispora | 0 | 308 |
| Chelativorans | 129 | 0 |
| Chitinophaga | 302 | 0 |
| Chondromyces | 22 | 0 |
| Collimonas | 0 | 41 |
| Conexibacter | 0 | 333 |
| Denitratisoma | 71 | 0 |
| Desulfonatronum | 171 | 0 |
| Desulfuromonas | 280 | 0 |
| Devosia | 0 | 246 |
| Dinghuibacter | 0 | 19 |
| Dokdonella | 0 | 39 |
| Dyadobacter | 0 | 28 |
| Elioraea | 0 | 37 |
| Erythrobacter | 91 | 0 |
| Ferrimicrobium | 317 | 0 |
| Ferruginibacter | 213 | 0 |
| Fibrobacter | 45 | 0 |
| Flavitalea | 0 | 127 |
| Frigoribacterium | 0 | 35 |
| Goodfellowiella | 0 | 151 |
| Granulicella | 0 | 2639 |
| Haliangium | 70 | 0 |
| Hartmannibacter | 35 | 0 |
| Helicobacter | 337 | 0 |
| Herbaspirillum | 0 | 22 |
| Ideonella | 47 | 0 |
| Inquilinus | 0 | 24 |
| Jatrophihabitans | 0 | 175 |
| Jiangella | 253 | 0 |
| Kaistibacter | 0 | 166 |
| Kineosporia | 0 | 126 |
| Kofleria | 37 | 0 |
| Krasilnikovia | 246 | 0 |
| Kutzneria | 0 | 92 |
| Labedaea | 0 | 173 |
| Lentzea | 306 | 0 |
| Leptothrix | 0 | 265 |
| Lewinella | 159 | 0 |
| Lysobacter | 0 | 282 |
| Marmoricola | 0 | 37 |
| Mesorhizobium | 256 | 0 |
| Methylobrevis | 66 | 0 |
| Methyloceanibacter | 556 | 0 |
| Methylosinus | 0 | 103 |
| Methylotenera | 2469 | 0 |
| Microcystis | 211 | 0 |
| Mycobacterium | 0 | 107 |
| Nakamurella | 63 | 0 |
| Natranaerovirga | 74 | 0 |
| Niabella | 211 | 0 |
| Niameybacter | 0 | 108 |
| Niastella | 475 | 0 |
| Nitratifractor | 0 | 173 |
| Nitrosospira | 813 | 0 |
| Nonomuraea | 0 | 65 |
| Occallatibacter | 0 | 249 |
| Paludibaculum | 0 | 2367 |
| Parasegetibacter | 194 | 0 |
| Pedobacter | 0 | 126 |
| Pelomonas | 83 | 0 |
| Phaselicystis | 84 | 0 |
| Phycicoccus | 0 | 31 |
| Phytomonospora | 214 | 0 |
| Piscinibacter | 86 | 0 |
| Plantactinospora | 353 | 0 |
| Polaromonas | 57 | 0 |
| Promicromonospora | 138 | 0 |
| Providencia | 55 | 0 |
| Pseudomonas | 0 | 28 |
| Pseudonocardia | 0 | 379 |
| Pseudoxanthobacter | 0 | 56 |
| Puia | 0 | 508 |
| Reyranella | 0 | 86 |
| Rhizocola | 20 | 0 |
| Rhizomicrobium | 0 | 651 |
| Rhizorhabdus | 2505 | 0 |
| Rhodanobacter | 0 | 75 |
| Rhodoferax | 329 | 0 |
| Rhodomicrobium | 375 | 0 |
| Rhodopila | 0 | 26 |
| Rhodoplanes | 148 | 0 |
| Rhodopseudomonas | 0 | 440 |
| Roseiarcus | 0 | 3935 |
| Rubrivivax | 0 | 49 |
| Saccharomonospora | 128 | 0 |
| Salinispora | 90 | 0 |
| Skermanella | 0 | 165 |
| Solirubrobacter | 0 | 654 |
| Sorangium | 30 | 0 |
| Sphingobacterium | 391 | 0 |
| Sphingomonas | 838 | 0 |
| Stenotrophomonas | 0 | 18 |
| Steroidobacter | 0 | 143 |
| Streptacidiphilus | 0 | 494 |
| Streptomyces | 683 | 0 |
| Sulfurisoma | 200 | 0 |
| Tabrizicola | 90 | 0 |
| Telmatobacter | 0 | 5097 |
| Terracidiphilus | 0 | 448 |
| Terriglobus | 0 | 83 |
| Thermocatellispora | 0 | 85 |
| Uliginosibacterium | 51 | 0 |
| Umezawaea | 207 | 0 |
| Virgisporangium | 49 | 0 |