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Plant Physiol Biochem

Title:		Impact of heat priming on heat shock responses in Origanum vulgare: Enhanced foliage photosynthetic tolerance and biphasic emissions of volatiles
Author(s):		Sulaiman HY; Liu B; Abiola YO; Kaurilind E; Niinemets U;
Address:		"Chair of Crop Science and Plant Biology, Estonian University of Life Sciences, Kreutzwaldi 1, 51006, Tartu, Estonia. Electronic address: Hassan@emu.ee. Chair of Crop Science and Plant Biology, Estonian University of Life Sciences, Kreutzwaldi 1, 51006, Tartu, Estonia. Electronic address: Bin.liu@emu.ee. Chair of Crop Science and Plant Biology, Estonian University of Life Sciences, Kreutzwaldi 1, 51006, Tartu, Estonia. Chair of Crop Science and Plant Biology, Estonian University of Life Sciences, Kreutzwaldi 1, 51006, Tartu, Estonia; Estonian Academy of Sciences, Kohtu 6, 10130, Tallinn, Estonia"
Journal Title:		Plant Physiol Biochem
Year:		2023
Volume:		20230209
Issue:
Page Number:		567 - 579
DOI:		10.1016/j.plaphy.2023.02.013
ISSN/ISBN:		1873-2690 (Electronic) 0981-9428 (Linking)
Abstract:		"Climate change enhances the frequency of heatwaves that negatively affect photosynthesis and can alter constitutive volatile emissions and elicit emissions of stress volatiles, but how pre-exposure to mildly warmer temperatures affects plant physiological responses to subsequent severe heat episodes remains unclear, especially for aromatic plants with high and complex volatile defenses. We studied the impact of heat shock (45 degrees C/5 min) applied alone and after exposure to moderate heat stress (35 degrees C/1 h, priming) on foliage photosynthesis and volatile emissions in the aromatic plant Origanum vulgare through 72 h recovery period. Heat stress decreased photosynthesis rates and stomatal conductance, whereas the reductions in photosynthesis were primarily due to non-stomatal factors. In non-primed plants, heat shock-induced reductions in photosynthetic activity were the greatest, but photosynthetic activity completely recovered by the end of the experiment. In primed plants, a certain inhibition of photosynthetic activity remained, suggesting a sustained priming effect. Heat shock enhanced the emissions of volatiles including lipoxygenase pathway volatiles, long-chained fatty acid-derived compounds, mono- and sesquiterpenes, geranylgeranyl diphosphate pathway volatiles, and benzenoids, whereas different heat treatments resulted in unique emission blends. In non-primed plants, stress-elicited emissions recovered at 72 h. In primed plants, volatile emissions were multiphasic, the first phase, between 0.5 and 10 h, reflected the primary stress response, whereas the secondary rise, between 24 and 72 h, indicated activations of different defense metabolic pathways. Our results demonstrate that exposure to mild heat leads to a sustained physiological stress memory that enhances plant resistance to subsequent severe heat stress episodes"
Keywords:		"*Origanum Heat-Shock Response Stress, Physiological Photosynthesis Metabolic Networks and Pathways *Volatile Organic Compounds/metabolism Plant Leaves/metabolism Benzenoids Heat acclimation Heat stress responses Lipoxygenase volatiles Monoterpenes Rubisco;"
Notes:		"MedlineSulaiman, Hassan Yusuf Liu, Bin Abiola, Yusuph Olawale Kaurilind, Eve Niinemets, Ulo eng 322603/ERC_/European Research Council/International France 2023/02/13 Plant Physiol Biochem. 2023 Mar; 196:567-579. doi: 10.1016/j.plaphy.2023.02.013. Epub 2023 Feb 9"