Assessment of Tannin Variation in Tamarisk Foliage Across a Latitudinal Gradient

Hussey, Amanda M.

doi:10.2174/1875040001104010032

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…Differences in secondary metabolites should also have been minimized by using only one species and growing all of the populations in the common garden with similar environmental conditions. Further, secondary metabolites in Tamarix were not found to vary across a broad latitudinal gradient of source populations in a similar common garden study (Hussey et al., 2011).…”

Section: Methodsmentioning

confidence: 76%

Spenders versus savers: Climate‐induced carbon allocation trade‐offs in a recently introduced woody plant

et al. 2021

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Non‐structural carbohydrate (NSC) storage may be under strong selection in woody plant species that occur across broad environmental gradients. We therefore investigated carbon (C) allocation strategies in a widespread non‐native woody plant, Tamarix. We predicted that genotypes with exposure to episodic freeze events would show elevated NSC concentrations compared to warm‐adapted genotypes with the trade‐off of reduced growth and reproduction relative to warm‐adapted populations. We established an experimental common garden using genotypes of Tamarix, sourced across a strong thermal gradient within the introduced range. We measured seasonal NSC storage in coarse roots and stems, above‐ground growth and flower production. Autumn NSC concentrations were 50% higher in genotypes from sites with episodic spring freeze events compared to genotypes from warmer sites. These cold‐adapted genotypes also had a 2.3‐fold higher starch to soluble sugar ratio than warm‐adapted genotypes. Across all genotypes and seasons, NSC storage was inversely correlated with growth and reproduction. Results suggest that Tamarix from colder locations cope with freeze events by maintaining large storage pools to support tissue regrowth, but with the trade‐off of overall reduced growth and reproduction. Our results are consistent with rapid selection in C allocation strategies in response to climate in introduced woody species. A free Plain Language Summary can be found within the Supporting Information of this article.

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Section: Methodsmentioning

confidence: 76%

Spenders versus savers: Climate‐induced carbon allocation trade‐offs in a recently introduced woody plant

et al. 2021

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show abstract

“…Differences in secondary metabolites should also have been minimized by using only one species growing in similar environmental conditions. Secondary metabolites in Tamarix were not found to vary across a broad latitudinal gradient of source populations in a common garden study (Hussey et al, 2011).…”

Section: Methodsmentioning

confidence: 98%

Episodic defoliation rapidly reduces starch but not soluble sugars in an invasive shrub, Tamarix spp.

Dehn

Bush

Acharya

et al. 2021

American J of Botany

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Premise Plants rely on pools of internal nonstructural carbohydrates (NSCs: soluble sugars plus starch) to support metabolism, growth, and regrowth of tissues damaged from disturbance such as foliage herbivory. However, impacts of foliage herbivory on the quantity and composition of NSC pools in long‐lived woody plants are currently unclear. We implemented a controlled defoliation experiment on mature Tamarix spp.—a dominant riparian woody shrub/tree that has evolved with intense herbivory pressure—to test two interrelated hypotheses: (1) Repeated defoliation disproportionately impacts aboveground versus belowground NSC storage. (2) Defoliation disproportionately impacts starch versus soluble sugar storage. Methods Hypotheses were tested by transplanting six Tamarix seedlings into each of eight cylinder mesocosms (2 m diameter, 1 m in depth). After 2.5 years, plants in four of the eight mesocosms were mechanically defoliated repeatedly over a single growing season, and all plants were harvested in the following spring. Results Defoliation had no impact on either above‐ or belowground soluble sugar pools. However, starch in defoliated plants dropped to 55% and 26% in stems and roots, respectively, relative to control plants, resulting in an over 2‐fold higher soluble sugar to starch ratio in defoliated plants. Conclusions The results suggest that defoliation occurring over a single growing season does not impact immediate plant functions such as osmoregulation, but depleted starch could limit future fitness, particularly where defoliation occurs over multiple years. These results improve our understanding of how woody plants cope with episodic defoliation caused by foliage herbivory and other disturbances.

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Assessment of Tannin Variation in Tamarisk Foliage Across a Latitudinal Gradient

Cited by 2 publications

References 10 publications

Spenders versus savers: Climate‐induced carbon allocation trade‐offs in a recently introduced woody plant

Spenders versus savers: Climate‐induced carbon allocation trade‐offs in a recently introduced woody plant

Episodic defoliation rapidly reduces starch but not soluble sugars in an invasive shrub, Tamarix spp.

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