| Title: | Impacts of Dutch elm disease-causing fungi on foliage photosynthetic characteristics and volatiles in Ulmus species with different pathogen resistance |
| Author(s): | Kannaste A; Jurisoo L; Runno-Paurson E; Kask K; Talts E; Parlist P; Drenkhan R; Niinemets U; |
| Address: | "Chair of Crop Science and Plant Biology, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51006, Estonia. Chair of Silviculture and Forest Ecology, Institute of Forestry and Engineering, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51006, Estonia. Estonian Academy of Sciences, Kohtu 6, Tallinn 10130, Estonia" |
| ISSN/ISBN: | 1758-4469 (Electronic) 0829-318X (Linking) |
| Abstract: | "Global warming affects the abiotic and biotic growth environment of plants, including the spread of fungal diseases such as Dutch elm disease (DED). Dutch elm disease-resistance of different Ulmus species varies, but how this is reflected in leaf-level physiological pathogen responses has not been investigated. We studied the impacts of mechanical injury alone and mechanical injury plus inoculation with the DED-causing pathogens Ophiostoma novo-ulmi subsp. novo-ulmi and O. novo-ulmi subsp. americana on Ulmus glabra, a more vulnerable species, and U. laevis, a more resistant species. Plant stress responses were evaluated for 12 days after stress application by monitoring leaf net CO2 assimilation rate (A), stomatal conductance (gs), ratio of ambient to intercellular CO2 concentration (Ca/Ci) and intrinsic water-use efficiency (A/gs), and by measuring biogenic volatile (VOC) release by plant leaves. In U. glabra and U. laevis, A was not affected by time, stressors or their interaction. Only in U. glabra, gs and Ca/Ci decreased in time, yet recovered by the end of the experiment. Although the emission compositions were affected in both species, the stress treatments enhanced VOC emission rates only in U. laevis. In this species, mechanical injury especially when combined with the pathogens increased the emission of lipoxygenase pathway volatiles and dimethylallyl diphosphate and geranyl diphosphate pathway volatiles. In conclusion, the more resistant species U. laevis had a more stable photosynthesis, but stronger pathogen-elicited volatile response, especially after inoculation by O. novo-ulmi subsp. novo-ulmi. Thus, stronger activation of defenses might underlay higher DED-resistance in this species" |
| Keywords: | *Ulmus/physiology Carbon Dioxide *Volatile Organic Compounds Plant Diseases/microbiology *Ophiostoma/physiology Photosynthesis Ophiostoma novo-ulmi subsp.americana Ophiostoma novo-ulmi subsp.novo-ulmi fungal pathogen stress response volatile organic com; |
| Notes: | "MedlineKannaste, Astrid Jurisoo, Liina Runno-Paurson, Eve Kask, Kaia Talts, Eero Parlist, Piret Drenkhan, Rein Niinemets, Ulo eng Research Support, Non-U.S. Gov't Canada 2022/09/16 Tree Physiol. 2023 Jan 5; 43(1):57-74. doi: 10.1093/treephys/tpac108" |
