Changes in carbon and nitrogen metabolism during seawater-induced mortality of Picea sitchensis trees

Autor:	Weibin Li, Peipei Zhang, Wenzhi Wang, Scott R. Waichler, Alison Meyers-Pigg, Nicholas D. Ward, Steve Yabusaki, Vanessa L. Bailey, Nate G. McDowell, Hongxia Zhang, M. J. Norwood, Chuanyan Zhao, Riley T Leff
Rok vydání:	2021
Předmět:	0106 biological sciences 0301 basic medicine Nitrogen Physiology chemistry.chemical_element Plant Science Photosynthesis 01 natural sciences Trees 03 medical and health sciences Animal science Seawater Picea Nitrogen cycle Ecosystem Metabolism Carbohydrate Photosynthetic capacity Carbon Salinity 030104 developmental biology chemistry 010606 plant biology & botany
Zdroj:	Tree Physiology. 41:2326-2340
ISSN:	1758-4469
Popis:	Increasing seawater exposure is causing mortality of coastal forests, yet the physiological response associated with seawater-induced tree mortality, particularly in non-halophytes, is poorly understood. We investigated the shifts in carbon and nitrogen (N) metabolism of mature Sitka-spruce trees that were dying after an ecosystem-scale manipulation of tidal seawater exposure. Soil porewater salinity and foliar ion concentrations increased after seawater exposure and were strongly correlated with the percentage of live foliated crown (PLFC; e.g., crown ‘greenness’, a measure of progression to death). Co-occurring with decreasing PLFC was decreasing photosynthetic capacity, N-investment into photosynthesis, N-resorption efficiency and non-structural carbohydrate (soluble sugars and starch) concentrations, with the starch reserves depleted to near zero when PLFC dropped below 5%. Combined with declining PLFC, these changes subsequently decreased total carbon gain and thus exacerbated the carbon starvation process. This study suggests that an impairment in carbon and N metabolism during the mortality process after seawater exposure is associated with the process of carbon starvation, and provides critical knowledge necessary to predict sea-level rise impacts on coastal forests.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::25a1f182bfbf6968e11a3a7ac2180ffc https://doi.org/10.1093/treephys/tpab073 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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