The effect of individual genetic heterozygosity on general homeostasis, heterosis and resilience in Siberian larch (Larix sibirica Ledeb.) using dendrochronology and microsatellite loci genotyping

Babushkina, Еlena А.; Ваганов, Е. А.; Grachev, Alexi M.; Орешкова, Н. В.; Belokopytova, Liliana V.; Kostyakova, T.V.; Krutovsky, Konstantin V.

doi:10.1016/j.dendro.2016.02.005

Cited by 18 publications

(21 citation statements)

References 67 publications

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“…The obtained SNPs were supposedly selectively neutral based on the F ST outlier analysis in Bayescan [48]. Most of them were likely located in the non-coding regions and, therefore, also increased their chances of being selectively neutral and making them and our data comparable to that of [33].…”

Section: Genome-wide Marker Developmentmentioning

confidence: 75%

“…on the Kenai Peninsula, Alaska, USA. We followed the approach outlined in Babushkina et al [33] to clarify our understanding of the molecular basis underlying stability and growth in forest species with a focus on the question: do individual trees with higher heterozygosity, approaching their altitudinal limit, exhibit more stable patterns of growth? We answered our research question by testing two hypotheses: (1) IndHet will be negatively correlated with VarTRW; and (2) IndHet will be positively correlated with AvTRW.…”

Section: Objectivementioning

confidence: 99%

“…They also found that AvTRW and VarTRW were significantly and positively correlated with each other. Babushkina et al [33] suggested that perhaps under unfavorable growing conditions most fast growing trees grow unstably regardless of the level of genetic diversity. However, they posit that with only eight microsatellite markers the resolution of their analysis may be limited and recommended an analysis using genome wide genotyping with thousands of molecular markers.…”

Section: Introductionmentioning

confidence: 99%

“…The authors of the study compared average individual tree-ring width (AvTRW), variance (VarTRW) and individual heterozygosity (IndHet), using eight highly polymorphic microsatellite markers, also known as simple sequence repeats (SSRs), with the assumption that individual trees with higher heterozygosity would positively correlate with heterosis and have more stable homeostasis reflecting less developmental dependence on their environment. With this in mind, Babushkina et al [33] tested the hypotheses that there would be a negative correlation between IndHet and VarTRW and a positive correlation between IndHet and AvTRW. Ultimately, their findings were inconclusive.…”

Section: Introductionmentioning

confidence: 99%

“…A recent study by Babushkina et al [33] introduced the idea of correlating individual heterozygosity to growth parameters using dendrochronological techniques in Siberian larch (Larix sibirica Ledeb.). The authors of the study compared average individual tree-ring width (AvTRW), variance (VarTRW) and individual heterozygosity (IndHet), using eight highly polymorphic microsatellite markers, also known as simple sequence repeats (SSRs), with the assumption that individual trees with higher heterozygosity would positively correlate with heterosis and have more stable homeostasis reflecting less developmental dependence on their environment.…”

Section: Introductionmentioning

confidence: 99%

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Growth and Its Relationship to Individual Genetic Diversity of Mountain Hemlock (Tsuga mertensiana) at Alpine Treeline in Alaska: Combining Dendrochronology and Genomics

Johnson

Chhetri

Krutovsky

et al. 2017

Forests

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Globally, alpine treelines are characterized as temperature-limited environments with strong controls on tree growth. However, at local scales spatially heterogeneous environments generally have more variable impacts on individual patterns of tree growth. In addition to the landscape spatial heterogeneity there is local variability in individual tree genetic diversity (level of individual heterozygosity). It has been hypothesized that higher individual heterozygosity will result in more consistent patterns of growth. In this article, we combine genomics and dendrochronology to explore the relationship between individual genetic diversity and tree growth at a mountain hemlock (Tsuga mertensiana Bong. Carr) alpine treeline on the Kenai Peninsula, Alaska, USA. We correlated average observed individual heterozygosity with average tree-ring width and variance in tree-ring width within individuals to test the hypothesis that trees with higher individual heterozygosity will also have more consistent growth patterns, suggesting that they may be more resilient to climate and environmental fluctuations at the alpine treeline. Our results showed that there was no significant relationship between tree growth and individual heterozygosity. However, there was a significant positive relationship between average tree-ring width and variance in tree-ring width implying that overall, fast growing trees in stressful environments, such as the alpine treeline, grow unstably regardless of the level of individual heterozygosity.

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Section: Genome-wide Marker Developmentmentioning

confidence: 75%

Section: Objectivementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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