The phenotypic and genetic effects of drought-induced stress on wood specific conductivity and anatomical properties in white spruce seedlings, and relationships with growth and wood density.

Autor:	Soro A; Renewable Materials Research Centre, Department of Wood and Forest Sciences, Université Laval, Québec, QC, Canada.; Canada Research Chair in Forest Genomics, Forest Research Centre and Institute for Systems and Integrative Biology, Université Laval, Québec QC, Canada.; Natural Resources Canada, Canadian Wood Fibre Centre, Québec, QC, Canada., Lenz P; Canada Research Chair in Forest Genomics, Forest Research Centre and Institute for Systems and Integrative Biology, Université Laval, Québec QC, Canada.; Natural Resources Canada, Canadian Wood Fibre Centre, Québec, QC, Canada., Roussel JR; Renewable Materials Research Centre, Department of Wood and Forest Sciences, Université Laval, Québec, QC, Canada., Nadeau S; Natural Resources Canada, Canadian Wood Fibre Centre, Québec, QC, Canada., Pothier D; Renewable Materials Research Centre, Department of Wood and Forest Sciences, Université Laval, Québec, QC, Canada., Bousquet J; Renewable Materials Research Centre, Department of Wood and Forest Sciences, Université Laval, Québec, QC, Canada.; Canada Research Chair in Forest Genomics, Forest Research Centre and Institute for Systems and Integrative Biology, Université Laval, Québec QC, Canada., Achim A; Renewable Materials Research Centre, Department of Wood and Forest Sciences, Université Laval, Québec, QC, Canada.
Jazyk:	angličtina
Zdroj:	Frontiers in plant science [Front Plant Sci] 2023 Dec 22; Vol. 14, pp. 1297314. Date of Electronic Publication: 2023 Dec 22 (Print Publication: 2023).
DOI:	10.3389/fpls.2023.1297314
Abstrakt:	Drought frequency and intensity are projected to increase with climate change, thus amplifying stress on forest trees. Resilience to drought implicates physiological traits such as xylem conductivity and wood anatomical traits, which are related to growth and wood density. Integrating drought-stress response traits at the juvenile stage into breeding criteria could help promote the survival of planted seedlings under current and future climate and thus, improve plantation success. We assessed in greenhouse the influence of drought-induced stress on 600 two-year-old white spruce ( Picea glauca ) seedlings from 25 clonal lines after two consecutive growing seasons. Three levels of drought-induced stress were applied: control, moderate and severe. Seedlings were also planted at a 45° angle to clearly separate compression from normal wood. We looked at the phenotypic and genetic effects of drought stress on xylem specific hydraulic conductivity, lumen diameter, tracheid diameter and length, and the number of pits per tracheid in the normal wood. We detected no significant effects of drought stress except for tracheid length, which decreased with increasing drought stress. We found low to high estimates of trait heritability, which generally decreased with increasing drought stress. Genetic correlations were higher than phenotypic correlations for all treatments. Specific conductivity was genetically highly correlated positively with lumen diameter and tracheid length under all treatments. Tracheid length and diameter were always negatively correlated genetically, indicating a trade-off in resource allocation. Moderate to high genetic correlations sometimes in opposite direction were observed between physico-anatomical and productivity traits, also indicating trade-offs. A large variation was observed among clones for all physico-anatomical traits, but clonal ranks were generally stable between control and drought-induced treatments. Our results indicate the possibility of early screening of genetic material for desirable wood anatomical attributes under normal growing conditions, thus allowing to improve the drought resilience of young trees. Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. (Copyright © 2023 Soro, Lenz, Roussel, Nadeau, Pothier, Bousquet and Achim.)
Databáze:	MEDLINE
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