Xylem Anatomical Variability in White Spruce at Treeline Is Largely Driven by Spatial Clustering

Frontiers in Plant Science
Timo PampuchMartin Wilmking

Abstract

The ecological function of boreal forests is challenged by drastically changing climate conditions. Although an increasing number of studies are investigating how climate change is influencing growth and distribution of boreal tree species, there is a lack of studies examining the potential of these species to genetically adapt or phenotypically adjust. Here, we sampled clonally and non-clonally growing white spruce trees (Picea glauca [Moench] Voss) to investigate spatial and genetic effects on tree ring width and on six xylem anatomical traits representing growth, water transport, mechanical support, and wood density. We compared different methods for estimating broad sense heritability (H2) of each trait and we evaluated the effects of spatial grouping and genetic grouping on the xylem anatomical traits with linear models. We found that the three different methods used to estimate H2 were quite robust, showing overall consistent patterns, while our analyses were unsuccessful at fully separating genetic from spatial effects. By evaluating the effect size, we found a significant effect of genetic grouping in latewood density and earlywood hydraulic diameter. However, evaluating model performances showed that spatial grouping w...Continue Reading

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Citations

Nov 12, 2021·Frontiers in Plant Science·Timo PampuchMartin Wilmking
Nov 23, 2021·Frontiers in Plant Science·Giulia ResenteMartin Wilmking

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Methods Mentioned

BETA
genotyping
PCR
PCA

Software Mentioned

CooRecorder
nlme R package
nlme R
R
ROXAS
CDendro
nlme
GeneMapper

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