Table 3.
Simple linear regression (SLR) and stepwise forward regression (SWFR) results.
| Simple linear regression (SLR) between the concentration of phloem sap metabolites in different citrus varieties and their degrees of tolerance to CLas. | |||||
|---|---|---|---|---|---|
| compound | R2 | P-value | Regression formula | ||
| fumaric | 0.07 | 0.0330 | rank = 2.4672713 − 0.1033573*fumaric | ||
| succinic acid | 0.01 | 0.5423 | rank = 2.0159913 + 0.2544109*succinic acid | ||
| malate | 0.05 | 0.0858 | rank = 2.4228736 − 0.0033815*malate | ||
| benzoic acid | 0.40 | <0.0001 | rank = 2.846556 − 0.1247415*benzoic acid | ||
| glycine | 0.24 | <0.0001 | rank = 1.2137884 + 2.464121* L-glycine | ||
| alanine | 0.08 | 0.02008 | rank = 1.4595241 + 0.5635009* L-alanine | ||
| valine | 0.33 | <0.0001 | rank = 1.4365366 + 3.1788655* L-valine | ||
| leucine | 0.35 | <0.0001 | rank = 1.1479306 + 4.6403882* L-leucine | ||
| GABA | 0.14 | 0.0018 | rank = 1.5367921 + 0.0968826*GABA | ||
| isoleucine | 0.01 | 0.8939 | rank = 2.1275553 − 0.0894776* L-isoleucine | ||
| threonine | 0.26 | 0.0001 | rank = 1.6537338 + 1.4218318* L-threonine | ||
| malic acid | 0.06 | 0.0372 | rank = 2.5545697 − 0.0107363*malic acid | ||
| proline | 0.01 | 0.4064 | rank = 1.8546825 + 0.0159869* L-proline | ||
| asparagine | 0.30 | <0.0001 | rank = 1.8293058 + 0.0201661* L-asparagine | ||
| aspartic acid | 0.21 | <0.0001 | rank = 1.4964464 + 0.2476606* L-aspartic acid | ||
| quinic acid | 0.13 | <0.0024 | rank = 1.8535996 + 0.0121467*quinic acid | ||
| citric acid | 0.09 | 0.0153 | rank = 1.8560199 + 0.0190329*citric acid | ||
| serine | 0.29 | <0.0001 | rank = 1.3563804 + 0.3112015* L-serine | ||
| glutamine | 0.21 | <0.0001 | rank = 1.8325813 + 0.1282487* L-glutamine | ||
| salicylic acid | 0.10 | 0.0106 | rank = 2.5278381 − 7.9565749*salicylic acid | ||
| glutamic acid | 0.03 | 0.2052 | rank = 1.9431001 + 1.7149994* L-glutamic acid | ||
| methionine | 0.21 | <0.0001 | rank = 1.4207654 + 20.700626* L-methionine | ||
| cysteine | 0.26 | <0.0001 | rank = 1.481304 + 31.896956* L-cysteine | ||
| phenylalanine | 0.41 | <0.0001 | rank = 0.8664052 + 10.784315* L-phenylalanine | ||
| myristic acid | 0.06 | 0.0451 | rank = 1.2877006 + 151.58439* myristic | ||
| palmitic acid | 0.07 | 0.0343 | rank = 1.2694889 + 24.498395* palmitic | ||
| lysine | 0.24 | <0.0001 | rank = 1.6619978 + 1.4715583* L-lysine | ||
| histidine | 0.30 | <0.0001 | rank = 1.7394908 + 4.0341786*histidine | ||
| linoleic acid | 0.01 | 0.4235 | rank = 1.8792104 + 39.64309*linoleic acid | ||
| oleic acid | 0.01 | 0.3618 | rank = 1.825534 + 37.441287*oleic acid | ||
| stearic | 0.05 | 0.0804 | rank = 1.4599026 + 23.933753* stearic | ||
| tyrosine | 0.18 | 0.0003 | rank = 1.3115472 + 9.9256764* L-tyrosine | ||
| tryptophan |
0.14 |
0.0019 |
rank = 1.7886113 + 10.823357* L-tryptophan |
||
| Stepwise forward regression (SWFR) between the concentration of phloem sap metabolites in different citrus varieties and their degree of tolerance to CLas. | |||||
| Compound (step number) |
R2 |
P-value |
Mallowe’s Criterion (Cp) |
Akaike information criterion (AICc) |
Bayesian information criterion (BIC) |
| phenylalanine (1) | 0.41 | 0.0000 | 70.419 | 476.516 | 482.749 |
| benzoic acid (2) | 0.61 | 0.0000 | 28.482 | 452.017 | 460.191 |
| serine (3) | 0.70 | 0.0000 | 8.0795 | 435.048 | 445.088 |
| stearic acid (4) | 0.73 | 0.0148 | 3.9023 | 430.992 | 442.82 |
| fumaric (5) | 0.76 | 0.0039 | −1.917 | 424.284 | 437.818 |
| linoleic acid (6) | 0.78 | 0.0316 | −3.884 | 421.664 | 436.818 |
| GABA (7) | 0.79 | 0.0815 | −4.367 | 420.863 | 437.548 |
| leucine (8) | 0.80 | 0.0918 | −4.616 | 420.323 | 438.441 |
| glutamic acid (9) | 0.81 | 0.1473 | −4.235 | 420.704 | 440.156 |