Genetic variation and genotype by environment interactions of juvenile wood chemical properties in<i>Pinus taeda</i>L.
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Bibliographic record
Abstract
Genetic variation and genotype by environment interaction (GE) were studied in several juvenile wood traits of 11 year-old loblolly pine trees (Pinus taeda L.).Wafer thin (200 m) samples from juvenile (ring 3) and transition (ring 8) wood of 12 mm increment cores were analyzed.Transition wood had higher -cellulose content (46.1%), longer fiber (1.98 mm), and higher coarseness (0.34), but lower lignin (29.7%) than juvenile wood (cellulose 40.9%, fiber length 1.4 mm, coarseness 0.28 and lignin 30.3%).General combining ability variance for the traits explained 2% to 10% of the total variance, whereas the specific combining ability variance was negligible, except for -cellulose content in transition wood (2%).Specific combining ability by site interaction variance explained from 5% (fiber length) to 37% (lignin) of the total variance.Weak individual-tree heritabilities were found for all the traits, except coarseness, which was moderately high in both juvenile (0.39) and transition wood (0.30).Full-sib and half-sib family heritabilities of traits ranged 0.29 to 0.72.Genetic correlations of wood quality traits with volume and stem straightness were weak, while favorable genetic correlations of lignin with cellulose, coarseness and fiber length were observed.Implications on forest tree improvement programs were discussed.heritability / genetic correlation / -cellulose / coarseness / lignin Rsum -Variabilit gntique et stabilit gnotype-environnement pour les proprits chimiques du bois un stade juvnile chez Pinus taeda L. La variabilit gntique et la stabilit gnotype-environnement (GE) ont t tudies pour plusieurs caractristiques du bois juvnile de pins taeda (Pinus taeda L.) gs de 11 ans.De petits chantillons de bois de 2 mm d'paisseur ont t extraits de carottes de sondage (12 mm), dans le bois juvnile (cerne 3) et dans la zone de transition (cerne 8).Le bois de transition a une teneur en -cellulose plus leve, des fibres plus longues (1,98 mm) et une grosseur de grain plus leve (0,34) mais une teneur en lignine (29,7 %) plus faible que le bois juvnile (teneur en cellulose : 40,9 %, longueur des fibres : 1,4 mm, grosseur du grain : 0,28 et teneur en lignine : 30,3 %).La variance des aptitudes gnrales la combinaison (AGC) explique entre 2 et 10 % de la variance totale, tandis que la variance des aptitudes spcifiques la combinaison (ASC) est ngligeable, except pour la teneur en -cellulose dans la zone de transition (2 %).La variance de du terme d'interaction SCA-site explique de 5 % (longueur de fibres) 37 % (teneur en lignine) de la variance totale.Les hritabilits au sens strict sont faibles pour tous les caractres sauf pour la grosseur du grain.Pour ce caractre, elle est modrment leve dans le bois juvnile (0,39) et dans la zone de transition (0,30).Les hritabilits au niveau moyennes de familles de pleins-frres et de demi-frres varient de 0,29 0,72 pour ces caractres.Les corrlations gntiques entre proprits du bois d'une part et le volume et la rectitude du tronc d'autre part sont faibles ; elles sont favorables entre teneur en lignine et teneur en cellulose, grosseur du grain et longueur de fibre.Les implications pour l'amlioration gntique de l'essence sont ensuite discutes.hritabilit / corrlation gntique / -cellulose / fibre / grosseur du grain / lignine
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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 | 0.001 |
| 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