Plasticity of photosynthetic heat tolerance in plants adapted to thermally contrasting biomes.

Autor: Zhu L; ARC Centre of Excellence in Plant Energy Biology, Research School of Biology, The Australian National University, Building 134, Canberra, Australian Capital Territory, 2601, Australia.; Division of Plant Sciences, Research School of Biology, The Australian National University, Building 46, Canberra, Australian Capital Territory, 2601, Australia., Bloomfield KJ; Division of Plant Sciences, Research School of Biology, The Australian National University, Building 46, Canberra, Australian Capital Territory, 2601, Australia., Hocart CH; Division of Plant Sciences, Research School of Biology, The Australian National University, Building 46, Canberra, Australian Capital Territory, 2601, Australia., Egerton JJG; Division of Plant Sciences, Research School of Biology, The Australian National University, Building 46, Canberra, Australian Capital Territory, 2601, Australia.; Division of Ecology and Evolution, Research School of Biology, The Australian National University, Building 116, Canberra, Australian Capital Territory, 2601, Australia., O'Sullivan OS; Division of Plant Sciences, Research School of Biology, The Australian National University, Building 46, Canberra, Australian Capital Territory, 2601, Australia., Penillard A; Division of Plant Sciences, Research School of Biology, The Australian National University, Building 46, Canberra, Australian Capital Territory, 2601, Australia., Weerasinghe LK; Division of Plant Sciences, Research School of Biology, The Australian National University, Building 46, Canberra, Australian Capital Territory, 2601, Australia.; Faculty of Agriculture, University of Peradeniya, Peradeniya, 20400, Sri Lanka., Atkin OK; ARC Centre of Excellence in Plant Energy Biology, Research School of Biology, The Australian National University, Building 134, Canberra, Australian Capital Territory, 2601, Australia.; Division of Plant Sciences, Research School of Biology, The Australian National University, Building 46, Canberra, Australian Capital Territory, 2601, Australia.
Jazyk: angličtina
Zdroj: Plant, cell & environment [Plant Cell Environ] 2018 Jun; Vol. 41 (6), pp. 1251-1262. Date of Electronic Publication: 2018 Jan 29.
DOI: 10.1111/pce.13133
Abstrakt: In many biomes, plants are subject to heatwaves, potentially causing irreversible damage to the photosynthetic apparatus. Field surveys have documented global, temperature-dependent patterns in photosynthetic heat tolerance (P HT ); however, it remains unclear if these patterns reflect acclimation in P HT or inherent differences among species adapted to contrasting habitats. To address these unknowns, we quantified seasonal variations in T crit (high temperature where minimal chlorophyll-a fluorescence rises rapidly, reflecting disruption to photosystem II) in 62 species native to 6 sites from 5 thermally contrasting biomes across Australia. T crit and leaf fatty acid (FA) composition (important for membrane stability) were quantified in three temperature-controlled glasshouses in 20 of those species. T crit was greatest at hot field sites and acclimated seasonally (summer > winter, increasing on average 0.34 °C per °C increase in growth temperature). The glasshouse study showed that T crit was inherently higher in species from warmer habitats (increasing 0.16 °C per °C increase in origin annual mean maximum temperature) and acclimated to increasing growth temperature (0.24 °C °C -1 ). Variations in T crit were positively correlated with the relative abundance of saturated FAs, with FAs accounting for 40% of T crit variation. These results highlight the importance of both plastic adjustments and inherent differences determining contemporary continent-wide patterns in P HT .
(© 2018 John Wiley & Sons Ltd.)
Databáze: MEDLINE
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