Tag: Sellin A.

Most species lose stomatal function following mid-term (4-7 d) exposure to high RH following leaf expansion

Stomatal behavior following mid- or long-term exposure to high relative air humidity: A review

Fanourakis D., Aliniaeifard S., Sellin A., Giday H., Körner O., Rezaei Nejad A., Delis C., Bouranis D., Koubouris G., Kambourakis E., Nikoloudakis N., Tsaniklidis G., (2020)

Dimitrios Fanourakis 1, Sasan Aliniaeifard 2, Arne Sellin 3, Habtamu Giday 4, Oliver Körner 5, Abdolhossein Rezaei Nejad 6, Costas Delis 7, Dimitris Bouranis 8, Georgios Koubouris 9, Emmanouil Kambourakis 10, Nikolaos Nikoloudakis 11, Georgios Tsaniklidis 12

  • 1 Department of Agriculture, School of Agricultural Sciences, Hellenic Mediterranean University, Estavromenos, GR-71500, Heraklion, Greece; Giannakakis SA, Export Fruits and Vegetables, Tympaki, Greece. Electronic address:
  • 2Department of Horticulture, College of Aburaihan, University of Tehran, Pakdasht, Tehran, Iran.
  • 3Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu, 51005, Estonia.
  • 4International Center for Biosaline Agriculture, ICBA, P.O. Box 14660, Dubai, United Arab Emirates.
  • 5Leibniz-Institute of Vegetable and Ornamental Crops (IGZ), Grossbeeren, Germany.
  • 6Department of Horticultural Sciences, Faculty of Agriculture, Lorestan University, P.O. Box 465, Khorramabad, Iran.
  • 7Department of Agriculture, University of the Peloponnese, GR-24100, Kalamata, Greece.
  • 8Plant Physiology and Morphology Laboratory, Crop Science Department, Agricultural University of Athens, Athens, Greece.
  • 9Laboratory of Olive Cultivation, Institute of Olive Tree, Subtropical Crops and Viticulture, Hellenic Agricultural Organization Demeter, Crete, Greece.
  • 10Department of Agriculture, School of Agricultural Sciences, Hellenic Mediterranean University, Estavromenos, GR-71500, Heraklion, Greece.
  • 11Cyprus University of Technology, Department of Agricultural Sciences, Biotechnology and Food Science, Cyprus.
  • 12Institute of Olive Tree, Subtropical Plants and Viticulture, Hellenic Agricultural Organization ‘Demeter’ (NAGREF), P.O. Box 2228, 71003, Heraklio, Greece.

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Plant Physiol Biochem. 153: 92-105 – doi: 10.1016/j.plaphy.2020.05.024 – Epub 2020 May 24 – PMID: 32485617 –

https://pubmed.ncbi.nlm.nih.gov/32485617/

Abstract

High relative air humidity (RH ≥ 85%) is frequent in controlled environments, and not uncommon in nature. In this review, we examine the high RH effects on plants with a special focus on stomatal characters. All aspects of stomatal physiology are attenuated by elevated RH during leaf expansion (long-term) in C3 species. These include impaired opening and closing response, as well as weak diel oscillations. Consequently, the high RH-grown plants are not only vulnerable to biotic and abiotic stress, but also undergo a deregulation between CO2 uptake and water loss. Stomatal behavior of a single leaf is determined by the local microclimate during expansion, and may be different than the remaining leaves of the same plant. No effect of high RH is apparent in C4 and CAM species, while the same is expected for species with hydropassive stomatal closure. Formation of bigger stomata with larger pores is a universal response to high RH during leaf expansion, whereas the effect on stomatal density appears to be species- and leaf side-specific. Compelling evidence suggests that ABA mediates the high RH-induced stomatal malfunction, as well as the stomatal size increase. Although high RH stimulates leaf ethylene evolution, it remains elusive whether or not this contributes to stomatal malfunction. Most species lose stomatal function following mid-term (4-7 d) exposure to high RH following leaf expansion. Consequently, the regulatory role of ambient humidity on stomatal functionality is not limited to the period of leaf expansion, but holds throughout the leaf life span.

Stomatal morphology can principally be important for photosynthesis limitation

 

 

Do stomata operate at the same relative opening range along a canopy profile of Betula pendula? 

by Eensalu E., Kupper P., Sellin A., Rahi M., Sober A., Kull O. (2008)

in Functional Plant Biology 35, 103–110.

CrossRef |

Abstract

Stomatal density and size were measured along the light gradient of a Betula pendula Roth. canopy in relation to microclimatic conditions. The theoretical stomatal conductance was calculated using stomatal density and dimensions to predict to what degree stomatal conductance is related to anatomical properties and relative stomatal opening.

Stomatal density was higher and leaf area smaller in the upper canopy, whereas epidermal cell density did not change significantly along the canopy light gradient, indicating that stomatal initiation is responsible for differences in stomatal density. Stomatal dimensions – the length of guard cell on the dorsal side and the guard cell width – decreased with declining light availability.

Maximum measured stomatal conductance and modelled stomatal conductance were higher at the top of the crown.

The stomata operate closer to their maximum openness and stomatal morphology is a more important determinant of stomatal conductance in the top leaves than in leaves of lower canopy.

As stomata usually limit photosynthesis more in upper than in lower canopy, it was concluded that stomatal morphology can principally be important for photosynthesis limitation in upper canopy.

 

Air humidity and stomata in aspen

Corrigendum: Does increased air humidity affect stomatal morphology and functioning in hybrid aspen?

by Niglas A., Alber M., Suur K., Jasin´ ska A. K., Kupper P., Sellin A. (2015)

in Botany, 93(4): 243–250.

doi.10.1139/cjb-2015-0004.

In the above paper, the first sentence in the Results should read as “From June to August, daily average RH was 3%–4% higher in H plots compared with the control.”

Furthermore, the axis labels of Fig. 3 were transposed in error and should be as in the corrected figure below. Received 28 August 2015. Accepted 28 August 2015.

A. Niglas, M. Alber, K. Suur, P. Kupper, and A. Sellin. Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, 51005 Tartu, Estonia. A.K. Jasin´ ska. Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, 51005 Tartu, Estonia; Institute of Dendrology, Polish Academy of Sciences, Parkowa 5, 62-035 Kórnik, Poland. Corresponding author: Aigar Niglas (e-mail: aigar.niglas@ut.ee). Fig. 3. Stomatal conductance (gS) versus leaf-to-air vapour pressure difference (VPDL) in leaves showing increasing response (IR) of stomatal conductance with rising VPDL. The IR data were divided into seven groups by VPDL; the data points represent means of the groups.

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ORIGINAL PAPER

ABSTRACT

The study investigated the effects of exposure to increased relative air humidity (RH) on stomatal morphology and sensitivity to stomata closure inducing stimulus (low RH) in hybrid aspen (Populus tremula L. × P. tremuloides Michx.) coppice growing in field conditions. Artificially elevated RH reduced air vapour pressure deficit by 5%–10% and altered stomatal sensitivity; trees grown under high RH exhibited stronger stomatal response to decreasing air humidity. We found no difference in mean stomatal pore length between treatments and a small decline in stomatal density under humidification. The lack of correlation between stomatal sensitivity and morphological traits suggests that stomatal sensitivity was unaffected by stomatal morphology. In light of rising atmospheric humidity predicted for high latitudes, strict stomatal control over water loss might be beneficial for trees if drought events become more frequent in the future. However, our experiment revealed that about two-thirds of the leaf-to-air vapour pressure difference (VPDL) response curves demonstrated the opposite pattern, i.e., stomatal opening in response to increasing VPDL. Strict stomatal regulation is probably not beneficial to fast-growing aspen coppice under low RH, as this trait may restrict their carbon gain and growth rate.

Effect of air humidity on stomatal morphology

 

Does increased air humidity affect stomatal morphology and functioning in hybrid aspen?

by Niglas A., Alber M., Suur K., Jaińska A. K., Kupper P., Sellin A. (2015)

in Botany, 10.1139/cjb-2015-0004

ABSTRACT

The study investigated the effects of exposure to increased relative air humidity (RH) on stomatal morphology and sensitivity to stomata closure inducing stimulus (low RH) in hybrid aspen (Populus tremula L. × P. tremuloides Michx.), coppice growing in field conditions.

Artificially elevated RH reduced air vapour pressure deficit by 5%–10% and altered stomatal sensitivity; trees grown under high RH exhibited stronger stomatal response to decreasing air humidity.

We found no difference in mean stomatal pore length between treatments and a small decline in stomatal density under humidification. The lack of correlation between stomatal sensitivity and morphological traits suggests that stomatal sensitivity was unaffected by stomatal morphology.

In light of rising atmospheric humidity predicted for high latitudes, strict stomatal control over water loss might be beneficial for trees if drought events become more frequent in the future. However, our experiment revealed that about two-thirds of the leaf-to-air vapour pressure difference (VPDL) response curves demonstrated the opposite pattern, i.e., stomatal opening in response to increasing VPDL.

Strict stomatal regulation is probably not beneficial to fast-growing aspen coppice under low RH, as this trait may restrict their carbon gain and growth rate.

See the text: NRC Research Press