Diverse chitinases are invoked during the activity-dormancy transition in spruce
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Bibliographic record
Abstract
North temperate tree species such as white spruce ( Picea glauca [Moench] Voss) have evolved strategies to protect themselves against abiotic and biotic stresses that trees encounter during the inclement winter months. Chitinases not only play well-documented roles in plant defense but also function during physiological and developmental preparations for overwintering, including growth cessation, cold and desiccation acclimation, and dormancy acquisition. Phylogenetic analysis of 31 white spruce and 52 Norway spruce chitinases identified genes falling into each of the five clusters, which sometimes—but not always—separated the different biochemical classes of chitinases. Digital expression profiling of white spruce and Norway spruce chitinases across multiple conditions revealed a range of spatiotemporal expression patterns. Transcript abundance profiling in buds, needles, stems, and roots by quantitative RT-PCR suggested roles for eight white spruce chitinases during the growth-to-dormancy transition. In silico analyses of these eight sequences suggested that two cluster 2/class I chitinases function as chitinolytic enzymes in the tree’s constitutive defense arsenal during the winter months. A cluster 2/class I, cluster 2/class II, and cluster 1/class IV chitinase each exhibit hallmarks of antifreeze proteins. Additionally, two cluster 2/class I chitinases and a cluster 1/class IV chitinase may serve as vegetative storage proteins. One cluster 3/class II chitinase exhibited attributes suggesting that it is a chitinase-like gene functioning in cell wall synthesis. Taken together, our results imply that dormancy-associated chitinases act in concert to (1) confer protection against freezing injury, pests, and pathogens, (2) store nitrogen, and (3) promote cell maturation that precedes growth cessation.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it