Warming and elevated CO2 alter tamarack C fluxes, growth and mortality: evidence for heat stress-related C starvation in the absence of water stress
| Autor: | Danielle A. Way, Bridget K Murphy |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
010504 meteorology & atmospheric sciences Physiology Acclimatization chemistry.chemical_element Larix Plant Science Photosynthesis 01 natural sciences Animal science Respiration 0105 earth and related environmental sciences 2. Zero hunger Dehydration biology Chemistry Global warming Temperature Starvation (glaciology) Carbon Dioxide biology.organism_classification Plant Leaves 13. Climate action Seedling Photosynthetic acclimation Carbon Heat-Shock Response 010606 plant biology & botany |
| Zdroj: | Tree Physiology. 41:2341-2358 |
| ISSN: | 1758-4469 |
| DOI: | 10.1093/treephys/tpab077 |
| Popis: | Climate warming is increasing the frequency of climate-induced tree mortality events. While drought combined with heat is considered the primary cause of this mortality, little is known about whether moderately high temperatures alone can induce mortality, or whether rising CO2 would prevent mortality at high growth temperatures. We grew tamarack (Larix laricina) under ambient (400 p.p.m.) and elevated (750 p.p.m.) CO2 concentrations combined with ambient, ambient +4 °C and ambient +8 °C growth temperatures to investigate whether high growth temperatures lead to carbon (C) limitations and mortality. Growth at +8 °C led to 40% mortality in the ambient CO2 (8TAC) treatment, but no mortality in the elevated CO2 treatment. Thermal acclimation of respiration led to similar leaf C balances across the warming treatments, despite a lack of photosynthetic acclimation. Photosynthesis was stimulated under elevated CO2, increasing seedling growth, but not leaf C concentrations. However, growth and foliar C concentrations were lowest in the +8 °C treatments, even with elevated CO2. Dying 8TAC seedlings had lower needle C concentrations and lower ratios of photosynthesis to respiration than healthy 8TAC seedlings, indicating that C limitations were likely the cause of seedling mortality under high growth temperatures. |
| Databáze: | OpenAIRE |
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