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

Sellin, Arne; Niglas, Aigar; Õunapuu-Pikas, Eele; Kupper, Priit

doi:10.1186/1471-2229-14-72

Cited by 34 publications

(24 citation statements)

References 59 publications

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“…Our observed decrease in the 299 adaxial trichome production in enhanced temperature could imply that the transpiration cooling 300 sufficiently regulates leaf temperatures in well-watered conditions, but when the increased 301 temperature coincides with drought the cooling effect is restricted due to stomatal closure. Lower 302 transpiration is known to increase leaf temperatures in silver birch (Sellin et al 2014). For many 303 plants in xeric ecosystems, such as brittlebrush (Encelia farinosa), the presence of non-glandular 304 trichomes is essential during drought, because they decrease absorbance of long-wave (thermal) 305 radiation of the leaves and thus lower leaf temperature (Ehleringer & Mooney 1978).…”

Section: Glandular Trichome Production Responds To Soil Moisture and mentioning

confidence: 99%

Production of glandular trichomes responds to water stress and temperature in silver birch (Betula pendula) leaves

et al. 2017

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Silver birch (Betula pendula Roth) allocates substantial resources to the production of glandular trichomes. If these trichomes can protect trees from temperature and water stress, their production would be expected to increase under these conditions. We studied how glandular trichome density and number in the leaves of two-year-old silver birch plantlets respond to single and combined treatments of elevated temperature (+1 °C) and three different levels of soil moisture (low, normal, and excess watering). Moreover, we quantified the seasonal variation in trichome density in mature long-shoot leaves of young, greenhouse-grown silver birches. Our results demonstrate clear differences between responses of glandular trichomes on different leaf surfaces. On the adaxial leaf surface, both drought and elevated temperature reduced the production of glandular trichomes. Interestingly, this response was absent in plants subjected to the combined treatment. Glandular trichome production on the abaxial leaf surface increased considerably in leaves produced during the growing season, reflecting a seasonal trend. Maintaining a strong seasonal increase in trichome production of abaxial surfaces even in low-water conditions suggests an important, though still unknown, role for abaxial glandular trichomes. In silver birch stems, those trichomes are strongly responsible for herbivore defense.

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Section: Glandular Trichome Production Responds To Soil Moisture and mentioning

confidence: 99%

Production of glandular trichomes responds to water stress and temperature in silver birch (Betula pendula) leaves

et al. 2017

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“…Effective regulation of transpiration, owing to functional stomata, is essential for plant survival, especially under conditions of water deficit (Sellin et al, 2014;Fanourakis et al, 2014). Stomatal ability to respond to closing signals (e.g., low water potential or light-dark transition) is determined by the environment during leaf expansion (Aliniaeifard and Van Meeteren, 2013;Carvalho et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Low air humidity during cultivation promotes stomatal closure ability in rose

Fanourakis¹,

Gebraegziabher

Hyldgaard

et al. 2019

Europ.J.Hortic.Sci

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In greenhouse horticulture, evaporative demand varies between seasons. For instance, plants are typically exposed to low relative air humidity (RH) during summer, whereas elevated RH prevails in winter. Since high RH during cultivation impairs stomatal functioning, some opposite changes might be expected, when plants are subjected to long-term low RH. To investigate this, Rosa hybrida 'Pasadena' was cultivated at 40, 60 or 90% RH. Plant performance, transpiration, stomatal closing ability and anatomy were recorded. As RH increased from 40 to 60% as well as from 60 to 90%, plants showed larger leaf area and thinner leaves. Plant water loss was mainly determined by ambient RH in the growing environment, with stomatal conductance (g s) being of secondary importance. With increasing RH, plant transpiration declined at growth environment. Larger stomata were found at 90% RH, as compared to 40 or 60%. Stomatal physiology was considerably affected by 90% RH, including reduced g s oscillations within the photoperiod, attenuated opening response following dark/light transition, as well as reduced closing response upon darkening. The plants cultivated at 90% RH had a reduced ability to control water loss upon water deprivation, compared to those grown at 60%. In contrast, cultivation at 40% RH resulted in stomata, which were much more responsive to water stress, compared to 60% RH-grown plants. This superiority was dual: lower transpiration rate combined with less severe leaf drying to induce stomatal closure. In conclusion, low RH during cultivation, which is typical during summer, leads to thicker leaves with very responsive stomata.

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“…Knowledge of the long-term effect of increasing atmospheric humidity on plant structure and functioning is still scant (Okamoto et al 2009;Tullus et al 2012;Sellin et al 2014). A Free Air Humidity Manipulation experiment (FAHM, Estonia) conducted on two deciduous woody species revealed an inhibitory effect of elevated humidity on both photosynthetic capacity and growth rate in a moderately humid temperate climate (Tullus et al 2012;.…”

Section: Introductionmentioning

confidence: 99%

Impact of elevated atmospheric humidity on anatomical and hydraulic traits of xylem in hybrid aspen

Jasiñska

Alber

Tullus

et al. 2015

Functional Plant Biol.

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This study was performed on hybrid aspen saplings growing at the Free Air Humidity Manipulation site in Estonia. We investigated changes in wood anatomy and hydraulic conductivity in response to increased air humidity. Two hydraulic traits (specific conductivity and leaf-specific conductivity) and four anatomical traits of stem wood – relative vessel area (VA), vessel density (VD), pit area and pit aperture area – were influenced by the humidity manipulation. Stem hydraulic traits decreased in the apical direction, whereas branch hydraulic characteristics tended to be greatest in mid-canopy, associated with branch size. A reduction in VD due to increasing humidity was accompanied by a decrease in vessel lumen diameter, hydraulically weighted mean diameter (Dh), xylem vulnerability index and theoretical hydraulic conductivity. VA and Dh combined accounted for 87.4% of the total variation in kt of branches and 85.5% of that in stems across the treatments. Characters of branch vessels were more stable, and only the vessel-grouping index (the ratio of the total number of vessels to the total number of vessel groupings) was dependent on the interactive effect of the treatment and canopy position. Our results indicate that the increasing atmospheric humidity predicted for high latitudes will result in moderate changes in the structure and functioning of the hybrid aspen xylem.

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

Cited by 34 publications

References 59 publications

Production of glandular trichomes responds to water stress and temperature in silver birch (Betula pendula) leaves

Production of glandular trichomes responds to water stress and temperature in silver birch (Betula pendula) leaves

Low air humidity during cultivation promotes stomatal closure ability in rose

Impact of elevated atmospheric humidity on anatomical and hydraulic traits of xylem in hybrid aspen

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