Claim · model-written summary
A decrease-increase-stabilize-decrease pattern in certain peaks, together with coordinated changes across peaks, is a unique spectral signature of PWD.
- Taxon
- Pinus thunbergii
Pinus thunbergiie1 - Interactor
- pine wood nematode
Bursaphelenchus xylophiluse1pathogen - Outcome
- decrease-increase-stabilize-decrease patterne2
Verbatim
e1“This study employed 3-year-old Pinus thunbergii seedlings as the experimental materials to compare the timing of anomaly detection in needle water content, relative conductivity (RC), and ATR-FTIR spectroscopy following inoculation with the pine wood nematode (PWN)”
e2“coordinated changes across multiple peaks and the distinctive decrease-increase-stabilize-decrease pattern observed in certain peaks constitute a unique spectral signature of PWD”
Title
Potential Advantages of Infrared Spectroscopy in Early Diagnosis of Pine Wilt Disease
Ying Li; Jianren Ye; Hao Cheng; et al. Plant Disease 2026. doi:10.1094/pdis-02-26-0426-re
Other claims from this paper (15)
- Observation An approximately two-week asymptomatic diagnostic window follows pine wood nematode infection in P. thunbergii seedlings.
- Method / resource ATR-FTIR spectroscopy enabled earlier detection of infection than needle water content or relative conductivity.
- Method / resource ATR-FTIR distinguished nematode stress from drought stress using differential trends at 2908 and 2840 cm⁻¹ and in full-spectrum integrated area.
- Method / resource PCA and PLS-DA across all stages gave a test-set accuracy of 30.5%, so simultaneous multi-stage discrimination was not feasible.
- Method / resource The OPLS-DA model for Stage 0 and Stage I reached a test-set accuracy of 85.2%.
- Method / resource The OPLS-DA model for Stage 0 and Stage I reached a sensitivity of 85.7%.
- Method / resource The OPLS-DA model for Stage 0 and Stage I reached a specificity of 84.6%.
- Method / resource The OPLS-DA model for Stage 0 and Stage I reached an AUC of 0.879.
- Observation The permutation test of the model was statistically significant.
- Observation VIP analysis identified nine markers with scores ≥ 1.0, driven by PC1 and raw spectral features.
- Observation In univariate tests only the A11_Peak_1278_existence variable was statistically significant.
- Observation Infrared spectroscopy can detect subtle anomalies in P. thunbergii seedlings infected with pine wood nematode while needles remain asymptomatic.
- Observation Derivative spectra revealed multiple early-stage characteristics of infection.
- Observation Needle water content changes were still insignificant in infected seedlings during the asymptomatic stage.
- Observation Cell membrane function had not yet been extensively compromised in infected seedlings during the asymptomatic stage.