Table 5.
Correlation analysis between environmental factors and five iridoids in root tissue of Gentiana rigescens.
| Factors | A | B | C | D | E | F | G | LA | GG | ST | GE | SW |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A | 1.000 | −0.464** | 0.412** | −0.187 | −0.201 | −0.458** | 0.054 | −0.343* | −0.081 | 0.096 | −0.019 | 0.023 |
| B | 1.000 | −0.325* | 0.393** | 0.257 | 0.357* | −0.186 | 0.160 | 0.329* | −0.331* | −0.320* | 0.018 | |
| C | 1.000 | −0.456** | −0.535** | −0.133 | 0.490** | −0.453** | −0.077 | −0.202 | −0.221 | −0.489** | ||
| D | 1.000 | 0.923** | 0.210 | −0.556** | 0.198 | 0.267 | 0.004 | 0.014 | 0.512** | |||
| E | 1.000 | 0.055 | −0.573** | 0.308* | 0.221 | 0.164 | 0.136 | 0.651** | ||||
| F | 1.000 | 0.346* | −0.049 | −0.090 | −0.224 | −0.257 | −0.324* | |||||
| G | 1.000 | −0.257 | −0.257 | −0.194 | −0.154 | −0.649** | ||||||
| LA | 1.000 | 0.104 | 0.499** | 0.614** | 0.321* | |||||||
| GG | 1.000 | 0.078 | 0.151 | 0.146 | ||||||||
| ST | 1.000 | 0.811** | 0.436** | |||||||||
| GE | 1.000 | 0.310* | ||||||||||
| SW | 1.000 |
The abbreviations are follow as: A, latitude; B, longitude; C altitude; D, average annual temperature; E, 5–7 monthly mean temperature; F, average annual precipitation; G, 5–10 monthly mean precipitation; LA, loganic acid; GG, 6'-O-β-D-glucopyranosylgentiopicroside; ST, swertiamarin; GE, gentiopicroside; and SW, sweroside, respectively. Significant differences (P < 0.05) marked as “*”, (P < 0.01) marked as “**”.