Natural variation of temperature acclimation of Arabidopsis thaliana

Author:

Hernandez Jakob Sebastian1,Dziubek Dejan1ORCID,Schröder Laura1,Seydel Charlotte12ORCID,Kitashova Anastasia1ORCID,Brodsky Vladimir1ORCID,Nägele Thomas1ORCID

Affiliation:

1. Faculty of Biology, Plant Evolutionary Cell Biology Ludwig‐Maximilians‐Universität München Planegg

2. Faculty of Biology, Plant Development Ludwig‐Maximilians‐Universität München Planegg

Abstract

AbstractAcclimation is a multigenic trait by which plants adjust photosynthesis and metabolism to cope with a changing environment. Here, natural variations of photosynthetic efficiency and acclimation of the central carbohydrate metabolism were analyzed in response to low and elevated temperatures. For this, 18 natural accessions of Arabidopsis thaliana, originating from Cape Verde Islands and Europe, were grown at 22°C before being exposed to 4°C and 34°C for cold and heat acclimation, respectively. Absolute amounts of carbohydrates were quantified together with their subcellular distribution across plastids, cytosol and vacuole. Linear electron transport rates (ETRs) were determined together with the maximum quantum efficiency of photosystem II (Fv/Fm) for all growth conditions and under temperature fluctuation. Under elevated temperature, ETR residuals under increasing photosynthetic photon flux densities significantly correlated with the degree of temperature fluctuation at the original habitat of accessions, indicating a geographical east/west gradient of photosynthetic acclimation capacities. Plastidial sucrose concentrations positively correlated with maximal ETRs under fluctuating temperature, indicating a stabilizing role within the chloroplast. Our findings revealed specific subcellular carbohydrate distributions that contribute differentially to the photosynthetic efficiency of natural Arabidopsis thaliana accessions across a longitudinal gradient. This sheds light on the relevance of subcellular metabolic regulation for photosynthetic performance in a fluctuating environment and supports the physiological interpretation of naturally occurring genetic variation of temperature tolerance and acclimation.

Funder

Deutsche Forschungsgemeinschaft

Publisher

Wiley

Subject

Cell Biology,Plant Science,Genetics,General Medicine,Physiology

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