TY - JOUR A1 - Perrella, Giorgio A1 - Bäurle, Isabel A1 - van Zanten, Martijn T1 - Epigenetic regulation of thermomorphogenesis and heat stress tolerance JF - New phytologist : international journal of plant science N2 - Many environmental conditions fluctuate and organisms need to respond effectively. This is especially true for temperature cues that can change in minutes to seasons and often follow a diurnal rhythm. Plants cannot migrate and most cannot regulate their temperature. Therefore, a broad array of responses have evolved to deal with temperature cues from freezing to heat stress. A particular response to mildly elevated temperatures is called thermomorphogenesis, a suite of morphological adaptations that includes thermonasty, formation of thin leaves and elongation growth of petioles and hypocotyl. Thermomorphogenesis allows for optimal performance in suboptimal temperature conditions by enhancing the cooling capacity. When temperatures rise further, heat stress tolerance mechanisms can be induced that enable the plant to survive the stressful temperature, which typically comprises cellular protection mechanisms and memory thereof. Induction of thermomorphogenesis, heat stress tolerance and stress memory depend on gene expression regulation, governed by diverse epigenetic processes. In this Tansley review we update on the current knowledge of epigenetic regulation of heat stress tolerance and elevated temperature signalling and response, with a focus on thermomorphogenesis regulation and heat stress memory. In particular we highlight the emerging role of H3K4 methylation marks in diverse temperature signalling pathways. KW - chromatin remodelling KW - elevated temperature KW - epigenetics KW - heat stress KW - histone modification KW - memory KW - temperature response KW - thermomorphogenesis Y1 - 2022 U6 - https://doi.org/10.1111/nph.17970 SN - 0028-646X SN - 1469-8137 VL - 234 IS - 4 SP - 1144 EP - 1160 PB - Wiley CY - Hoboken ER - TY - JOUR A1 - Moenickes, Sylvia A1 - Schneider, Anne-Kathrin A1 - Muehle, Lesley A1 - Rohe, Lena A1 - Richter, Otto A1 - Suhling, Frank T1 - From population-level effects to individual response: modelling temperature dependence in Gammarus pulex JF - The journal of experimental biology N2 - Population-level effects of global warming result from concurrent direct and indirect processes. They are typically described by physiologically structured population models (PSPMs). Therefore, inverse modelling offers a tool to identify parameters of individual physiological processes through population-level data analysis, e. g. the temperature dependence of growth from size-frequency data of a field population. Here, we make use of experiments under laboratory conditions, in mesocosms and field monitoring to determine the temperature dependence of growth and mortality of Gammarus pulex. We found an optimum temperature for growth of approximately 17 degrees C and a related temperature coefficient, Q(10), of 1.5 degrees C(-1), irrespective of whether we classically fitted individual growth curves or applied inverse modelling based on PSPMs to laboratory data. From a comparison of underlying data sets we conclude that applying inverse modelling techniques to population-level data results in meaningful response parameters for physiological processes if additional temperature-driven effects, including within-population interaction, can be excluded or determined independently. If this is not the case, parameter estimates describe a cumulative response, e. g. comprising temperature-dependent resource dynamics. Finally, fluctuating temperatures in natural habitats increased the uncertainty in parameter values. Here, PSPM should be applied for virtual monitoring in order to determine a sampling scheme that comprises important dates to reduce parameter uncertainty. KW - temperature response KW - temperature coefficient KW - Q(10) KW - optimum temperature KW - parameter estimation KW - inverse modelling Y1 - 2011 U6 - https://doi.org/10.1242/jeb.061945 SN - 0022-0949 VL - 214 IS - 21 SP - 3678 EP - 3687 PB - Company of Biologists Limited CY - Cambridge ER -