UV radiation and drought interact differently in grass and forb species of a mountain grassland

0565744 - ÚVGZ 2023 RIV IE eng J - Journal Article
Veselá, Barbora - Holub, Petr - Urban, Otmar - Surá, Kateřina - Hodaňová, Petra - Oravec, Michal - Divinova, Renata - Jansen, Marcel Arnold Karsten - Klem, Karel
UV radiation and drought interact differently in grass and forb species of a mountain grassland.
Plant Science. Roč. 325, DEC (2022), č. článku 111488. ISSN 0168-9452. E-ISSN 1873-2259
R&D Projects: GA MŠMT(CZ) LM2018123; GA MŠMT(CZ) EF16_019/0000797
Institutional support: RVO:86652079
Keywords : CO2 assimilation * Drought stress * Epidermal UV-screening * Grassland * Precipitation * Ultraviolet radiation
OECD category: Plant sciences, botany
Impact factor: 5.2, year: 2022
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0168945222003132?via%3Dihub

Among abiotic stressors, drought and enhanced ultraviolet radiation (UV) received a lot of attention, because of their potential to impair plant growth. Since drought and UV induce partially similar protective mechanisms, we tested the hypothesis that UV ameliorates the effect of reduced water availability (WA) in selected grass (Holcus mollis and Agrostis capillaris) and forb species (Hypericum maculatum and Rumex acetosa). During 2011-2014, an outdoor manipulation experiment was conducted on a mountain grassland ecosystem (Beskydy Mts, Czech Re-public). Lamellar shelters were used to pass (WAamb) or exclude (WA-) incident precipitation in order to simulate reduced water availability (WA). In addition, the lamellas were made from acrylics either transmitting (UVamb) or blocking (UV-) incident UV. Generally, both UV exposure and reduced WA enhanced epidermal UV-screening, while exposure to both factors resulted in less than additive interactions. Although UV radiation increased epidermal UV-screening rather in the grass (up to 29 % in A. capillaris) than forb (up to 12 % in H. maculatum) species and rather in well-watered than reduced WA plants, such acclimation response did not result in signif-icant alleviation of reduced WA effects on gas exchange and morphological parameters. The study contributes to a better understanding of plant responses to complex environmental conditions and will help for successful modelling forecasts of future climate change impacts.
Permanent Link: https://hdl.handle.net/11104/0337255