Adaptability of birch (Betula pendula Roth) and aspen (Populus tremula L.) genotypes to different soil moisture conditions

Possen, Boy J.H.M.; Oksanen, Elina; Rousi, Matti; Ruhanen, Hanna; Ahonen, Viivi; Tervahauta, Arja; Heinonen, Jaakko; Heiskanen, Juha; Kärenlampi, Sirpa; Vapaavuori, E.

doi:10.1016/j.foreco.2011.06.035

Cited by 51 publications

(39 citation statements)

References 73 publications

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“…The air humidification manipulation affected most of the studied characteristics, but not IWUE (Table 1), unlike the soil humidity manipulation reported by Possen et al [40]. In some species even long-term soil drought does not affect IWUE if A n and g S decrease with equal rates [41].…”

Section: Discussionmentioning

confidence: 96%

Rapid and long-term effects of water deficit on gas exchange and hydraulic conductance of silver birch trees grown under varying atmospheric humidity

et al. 2014

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BackgroundEffects of water deficit on plant water status, gas exchange and hydraulic conductance were investigated in Betula pendula under artificially manipulated air humidity in Eastern Estonia. The study was aimed to broaden an understanding of the ability of trees to acclimate with the increasing atmospheric humidity predicted for northern Europe. Rapidly-induced water deficit was imposed by dehydrating cut branches in open-air conditions; long-term water deficit was generated by seasonal drought.ResultsThe rapid water deficit quantified by leaf (ΨL) and branch water potentials (ΨB) had a significant (P < 0.001) effect on gas exchange parameters, while inclusion of ΨB in models resulted in a considerably better fit than those including ΨL, which supports the idea that stomatal openness is regulated to prevent stem rather than leaf xylem dysfunction. Under moderate water deficit (ΨL≥-1.55 MPa), leaf conductance to water vapour (gL), transpiration rate and leaf hydraulic conductance (KL) were higher (P < 0.05) and leaf temperature lower in trees grown in elevated air humidity (H treatment) than in control trees (C treatment). Under severe water deficit (ΨL<-1.55 MPa), the treatments showed no difference. The humidification manipulation influenced most of the studied characteristics, while the effect was to a great extent realized through changes in soil water availability, i.e. due to higher soil water potential in H treatment. Two functional characteristics (gL, KL) exhibited higher (P < 0.05) sensitivity to water deficit in trees grown under increased air humidity.ConclusionsThe experiment supported the hypothesis that physiological traits in trees acclimated to higher air humidity exhibit higher sensitivity to rapid water deficit with respect to two characteristics - leaf conductance to water vapour and leaf hydraulic conductance. Disproportionate changes in sensitivity of stomatal versus leaf hydraulic conductance to water deficit will impose greater risk of desiccation-induced hydraulic dysfunction on the plants, grown under high atmospheric humidity, in case of sudden weather fluctuations, and might represent a potential threat in hemiboreal forest ecosystems. There is no trade-off between plant hydraulic capacity and photosynthetic water-use efficiency on short time scale.

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Section: Discussionmentioning

confidence: 96%

Rapid and long-term effects of water deficit on gas exchange and hydraulic conductance of silver birch trees grown under varying atmospheric humidity

et al. 2014

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“…This might be related to the leaf sampling, which occurred 21 days after the start of a mild drought, when short‐term gene expression responses were replaced by acclimation of physiological processes. Similarly in Populus tremula , few changes in the expression of genes of interest were found in leaves sampled more than 20 days after the start of the drought (Possen et al, ). The drought response at the transcript level was highly genotype specific, in agreement with transcriptomic studies on poplar genotypes, showing divergent expression profiles under drought even when the physiological response was similar (Cohen et al, ; Wilkins et al, ).…”

Section: Discussionmentioning

confidence: 99%

Element content and expression of genes of interest in guard cells are connected to spatiotemporal variations in stomatal conductance

Durand

Cohen

Aubry

et al. 2019

Plant Cell & Environment

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Element content and expression of genes of interest on single cell types, such as stomata, provide valuable insights into their specific physiology, improving our understanding of leaf gas exchange regulation. We investigated how far differences in stomatal conductance (gs) can be ascribed to changes in guard cells functioning in amphistomateous leaves. gs was measured during the day on both leaf sides, on well‐watered and drought‐stressed trees (two Populus euramericana Moench and two Populus nigra L. genotypes). In parallel, guard cells were dissected for element content and gene expressions analyses. Both were strongly arranged according to genotype, and drought had the lowest impact overall. Normalizing the data by genotype highlighted a structure on the basis of leaf sides and time of day both for element content and gene expression. Guard cells magnesium, phosphorus, and chlorine were the most abundant on the abaxial side in the morning, where gs was at the highest. In contrast, genes encoding H+‐ATPase and aquaporins were usually more abundant in the afternoon, whereas genes encoding Ca2+‐vacuolar antiporters, K+ channels, and ABA‐related genes were in general more abundant on the adaxial side. Our work highlights the unique physiology of each leaf side and their analogous rhythmicity through the day.

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“…3c) the relationship was not very clear. However, the lack of sufficient soil moisture is an important stress factor for deciduous trees [33], and it is possible that dry or snowless winter conditions affect moisture conditions and consequently flowering buds or leaves in spring and summer, which provide food for flying squirrels. Indeed, the quality of summer food is a likely candidate that affects summer reproduction of the species.…”

Section: Discussionmentioning

confidence: 99%

Siberian flying squirrels do not anticipate future resource abundance

Selonen

Wistbacka

2016

BMC Ecol

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BackgroundOne way to cope with irregularly occurring resources is to adjust reproduction according to the anticipated future resource availability. In support of this hypothesis, few rodent species have been observed to produce, after the first litter born in spring, summer litters in anticipation of autumn’s seed mast. This kind of behaviour could eliminate or decrease the lag in population density normally present in consumer dynamics. We focus on possible anticipation of future food availability in Siberian flying squirrels, Pteromys volans. We utilise long-term data set on flying squirrel reproduction spanning over 20 years with individuals living in nest-boxes in two study areas located in western Finland. In winter and early spring, flying squirrels depend on catkin mast of deciduous trees. Thus, the temporal availability of food resource for Siberian flying squirrels is similar to other mast-dependent rodent species in which anticipatory reproduction has been observed.ResultsWe show that production of summer litters was not related to food levels in the following autumn and winter. Instead, food levels before reproduction, in the preceding winter and spring, were related to production of summer litters. In addition, the amount of precipitation in the preceding winter was found to be related to the production of summer litters.ConclusionsOur results support the conclusion that Siberian flying squirrels do not anticipate the mast. Instead, increased reproductive effort in female flying squirrels is an opportunistic event, seized if the resource situation allows.

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Adaptability of birch (Betula pendula Roth) and aspen (Populus tremula L.) genotypes to different soil moisture conditions

Cited by 51 publications

References 73 publications

Rapid and long-term effects of water deficit on gas exchange and hydraulic conductance of silver birch trees grown under varying atmospheric humidity

Rapid and long-term effects of water deficit on gas exchange and hydraulic conductance of silver birch trees grown under varying atmospheric humidity

Element content and expression of genes of interest in guard cells are connected to spatiotemporal variations in stomatal conductance

Siberian flying squirrels do not anticipate future resource abundance

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