Trees, 2017, Vol.31(4), pp.1215-1225
To access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link: http://dx.doi.org/10.1007/s00468-017-1539-1 Byline: Quynh Ngoc Nguyen (1,2), Andrea Polle (1), Rodica Pena (1) Keywords: Drought resistance; Drought avoidance; Drought tolerance; Climate change; Temperate forests; Isohydric; Anisohydric Abstract: Key message European beech presents intraspecific variations in drought resistance strategies that are mediated by the amount of precipitation in the habitat. Abstract Climate change predictions forecast extended drought periods, which are expected to pose an enhanced risk to forest trees. Here, we investigated the drought response and fitness traits in European beech (Fagus sylvatica L.) in response to a severe progressive drought. The capability of three beech provenances from habitats differing in annual precipitation (544, 665, and 766 mm year.sup.-1) to cope with drought was compared in a common garden experiment using beech seedlings. Soil and plant water status, maximum quantum yield of PSII, growth and biomass partitioning, stomatal conductance, and transcript abundance pattern of the kinase, Open Stomata 1 (OST1), of control (well-watered) and drought-treated (water withheld) plants from each provenance were repeatedly measured during a 60-day drought experiment. The lowest precipitation provenance displayed a more isohydric phenotype with a prompt stomatal closure, increased OST1 levels, high water potential and leaf water content, and a decrement in the maximum quantum yield of PSII. The other two provenances showed a more anisohydric stomatal regulation with a slow and delayed stomatal closure and a decrease in the water status. These findings suggest that intraspecific variations in beech for diverging drought resistance strategies exist and might be mediated by differences in the abscisic acid signaling pathway. The higher precipitation provenance maintained high quantum yield of PSII, and water potentials above -2.0 MPa for a longer period of time than the other two provenances, and consequently, mortality was delayed in this provenance. We concluded that lower precipitation adapted plants employ a drought resistance strategy suitable for the moderate drought, whereas the higher precipitation habitat plants revealed mechanisms, which could be better suited to cope with more severe drought events. Author Affiliation: (1) Forest Botany and Tree Physiology, University of Goettingen, Buesgenweg 2, 37077, Goettingen, Germany (2) Hung Vuong University, Nong Trang, Viet Tri, Phu Tho, Vietnam Article History: Registration Date: 07/03/2017 Received Date: 23/07/2016 Accepted Date: 06/03/2017 Online Date: 20/03/2017 Article note: Communicated by M. Zwieniecki.
Drought resistance ; Drought avoidance ; Drought tolerance ; Climate change ; Temperate forests ; Isohydric ; Anisohydric
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