| Title: | "Acute methyl jasmonate exposure results in major bursts of stress volatiles, but in surprisingly low impact on specialized volatile emissions in the fragrant grass Cymbopogon flexuosus" |
| Author(s): | Jiang Y; Ye J; Liu B; Rikisahedew JJ; Tosens T; Niinemets U; |
| Address: | "Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu, 51006, Estonia; College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China. Electronic address: qdjyf@hotmail.com. Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu, 51006, Estonia. Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu, 51006, Estonia; Estonian Academy of Sciences, Kohtu 6, 10130, Tallinn, Estonia. Electronic address: ylo.niinemets@emu.ee" |
| DOI: | 10.1016/j.jplph.2022.153721 |
| ISSN/ISBN: | 1618-1328 (Electronic) 0176-1617 (Linking) |
| Abstract: | "Methyl jasmonate (MeJA) is an airborne hormonal elicitor that induces a fast rise of emissions of characteristic stress marker compounds methanol and green leaf volatiles (GLV), and a longer-term release of volatile terpenoids, but there is limited information of how terpene emissions respond to MeJA in terpene-storing species. East-Indian lemongrass (Cymbopogon flexuosus), an aromatic herb with a large terpenoid storage pool in idioblasts, was used to investigate the short- (0-1 h) and long-term (1-16 h) responses of leaf net assimilation rate (A), stomatal conductance (G(s)) and volatile emissions to MeJA concentrations ranging from moderate to lethal. Both A and G(s) were increasingly inhibited with increasing MeJA concentration in both short and long term. MeJA exposure resulted in a rapid elicitation, within 1 h after exposure, of methanol and GLV emissions. Subsequently, a secondary rise of GLV emissions was observed, peaking at 2 h after MeJA exposure for the highest and at 8 h for the lowest application concentration. The total amount and maximum emission rate of methanol and the first and second GLV emission bursts were positively correlated with MeJA concentration. Unexpectedly, no de novo elicitation of terpene emissions was observed through the experiment. Although high MeJA application concentrations led to visible lesions and desiccation in extensive leaf regions, this did not result in breakage of terpene-storing idioblasts. The study highlights an overall insensitivity of lemongrass to MeJA and indicates that differently from mechanical wounding, MeJA-driven cellular death does not break terpene-storing cells. Further studies are needed to characterize the sensitivity of induced defense responses in species with strongly developed constitutive defenses" |
| Keywords: | Acetates/pharmacology Cyclopentanes/pharmacology *Cymbopogon Methanol Oxylipins/pharmacology Plant Leaves Poaceae Terpenes *Volatile Organic Compounds Biotic stress C4 plant Dose response Exogenous MeJA Green leaf volatiles Ptr-qms Stomatal closure; |
| Notes: | "MedlineJiang, Yifan Ye, Jiayan Liu, Bin Rikisahedew, Jesamine Joneva Tosens, Tiina Niinemets, Ulo eng Germany 2022/05/22 J Plant Physiol. 2022 Jul; 274:153721. doi: 10.1016/j.jplph.2022.153721. Epub 2022 May 15" |
