Heat tolerance of a tropical-subtropical rainforest tree species Polyscias elegans time-dependent dynamic responses of physiological thermostability and biochemistry

Heat tolerance of a tropical-subtropical rainforest tree species Polyscias elegans : time-dependent dynamic responses of physiological thermostability and biochemistry

© 2023 The Authors New Phytologist © 2023 New Phytologist Foundation.

Bibliographische Detailangaben
Veröffentlicht in:The New phytologist. - 1979. - 241(2024), 2 vom: 11. Jan., Seite 715-731
1. Verfasser: Zhu, Lingling (VerfasserIn)
Weitere Verfasser: Scafaro, Andrew P, Vierling, Elizabeth, Ball, Marilyn C, Posch, Bradley C, Stock, Frederike, Atkin, Owen K
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2024
Zugriff auf das übergeordnete Werk:The New phytologist
Schlagworte:Journal Article chlorophyll fluorescence heat wave membrane osmoprotectants photosystem II stress proteins thermal tolerance Heat-Shock Proteins
Beschreibung
Zusammenfassung:© 2023 The Authors New Phytologist © 2023 New Phytologist Foundation.
Heat stress interrupts physiological thermostability and triggers biochemical responses that are essential for plant survival. However, there is limited knowledge on the speed plants adjust to heat in hours and days, and which adjustments are crucial. Tropical-subtropical rainforest tree species (Polyscias elegans) were heated at 40°C for 5 d, before returning to 25°C for 13 d of recovery. Leaf heat tolerance was quantified using the temperature at which minimal chl a fluorescence sharply rose (Tcrit ). Tcrit , metabolites, heat shock protein (HSP) abundance and membrane lipid fatty acid (FA) composition were quantified. Tcrit increased by 4°C (48-52°C) within 2 h of 40°C exposure, along with rapid accumulation of metabolites and HSPs. By contrast, it took > 2 d for FA composition to change. At least 2 d were required for Tcrit , HSP90, HSP70 and FAs to return to prestress levels. The results highlight the multi-faceted response of P. elegans to heat stress, and how this response varies over the scale of hours to days, culminating in an increased level of photosynthetic heat tolerance. These responses are important for survival of plants when confronted with heat waves amidst ongoing global climate change
Beschreibung:Date Completed 17.02.2024
Date Revised 17.02.2024
published: Print-Electronic
Citation Status MEDLINE
ISSN:1469-8137
DOI:10.1111/nph.19356