| Title: | "Heat priming improved heat tolerance of photosynthesis, enhanced terpenoid and benzenoid emission and phenolics accumulation in Achillea millefolium" |
| Author(s): | Liu B; Zhang L; Rusalepp L; Kaurilind E; Sulaiman HY; Pussa T; Niinemets U; |
| Address: | "Chair of Crop Science and Plant Biology, Estonian University of Life Sciences, Tartu, Estonia. College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, China. Chair of Food Hygiene and Veterinary Public Health, Estonian University of Life Sciences, Tartu, Estonia. Estonian Academy of Sciences, Tallinn, Estonia. School of Forestry and Bio-Technology, Zhejiang Agriculture and Forestry University, Hangzhou, China" |
| ISSN/ISBN: | 1365-3040 (Electronic) 0140-7791 (Linking) |
| Abstract: | "The mechanism of heat priming, triggering alteration of secondary metabolite pathway fluxes and pools to enhance heat tolerance is not well understood. Achillea millefolium is an important medicinal herbal plant, rich in terpenoids and phenolics. In this study, the potential of heat priming treatment (35 degrees C for 1 hr) to enhance tolerance of Achillea plants upon subsequent heat shock (45 degrees C for 5 min) stress was investigated through recovery (0.5-72 hr). The priming treatment itself had minor impacts on photosynthesis, led to moderate increases in the emission of lipoxygenase (LOX) pathway volatiles and isoprene, and to major elicitation of monoterpene and benzaldehyde emissions in late stages of recovery. Upon subsequent heat shock, in primed plants, the rise in LOX and reduction in photosynthetic rate (A) was much less, stomatal conductance (g(s) ) was initially enhanced, terpene emissions were greater and recovery of A occurred faster, indicating enhanced heat tolerance. Additionally, primed plants accumulated higher contents of total phenolics and condensed tannins at the end of the recovery. These results collectively indicate that heat priming improved photosynthesis upon subsequent heat shock by enhancing g(s) and synthesis of volatile and non-volatile secondary compounds with antioxidative characteristics, thereby maintaining the integrity of leaf membranes under stress" |
| Keywords: | Achillea/metabolism/*physiology Erythritol/analogs & derivatives/metabolism Flavonoids/metabolism Heat-Shock Response/physiology Lipoxygenase/metabolism Pentosephosphates/metabolism Phenols/*metabolism Photosynthesis/physiology Plant Leaves/chemistry/phys; |
| Notes: | "MedlineLiu, Bin Zhang, Lu Rusalepp, Linda Kaurilind, Eve Sulaiman, Hassan Yusuf Pussa, Tonu Niinemets, Ulo eng 322603/ERC_/European Research Council/International Research Support, Non-U.S. Gov't 2020/06/26 Plant Cell Environ. 2021 Jul; 44(7):2365-2385. doi: 10.1111/pce.13830. Epub 2020 Aug 12" |
