Ott Kangur "Nocturnal water relations and predawn water potential disequilibrium in temperate deciduous tree species" | University of Tartu

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Contacts of UT units

Faculty of Arts and Humanities
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Faculty address: 
Jakobi 2, rooms 116–121, 51005 Tartu
  • Dean's Office
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    Jakobi 2, rooms 116–121, 51005 Tartu
  • Institute of History and Archaeology
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    Jakobi 2, 51005 Tartu
  • Institute of Estonian and General Linguistics
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    Jakobi 2, 51005 Tartu
  • Institute of Philosophy and Semiotics
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    Jakobi 2, rooms 309–352, 51005 Tartu
  • Institute of Cultural Research
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    Ülikooli 16, 51003 Tartu
  • School of Theology and Religious Studies
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    Ülikooli 18–310, 50090 Tartu
  • College of Foreign Languages and Cultures
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  • Viljandi Culture Academy
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    Posti 1, 71004 Viljandi
Faculty of Social Sciences
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Lossi 36, 51003 Tartu
  • Dean's Office
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    Lossi 36, 51003 Tartu
  • Institute of Education
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    Salme 1a–29, 50103 Tartu
  • Johan Skytte Institute of Political Studies
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  • School of Economics and Business Administration
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  • Institute of Physics
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    W. Struve 1, 50091 Tartu
  • Youth Academy
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    Uppsala 10, 51003 Tartu
  • Institute of Genomics
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    Riia 23b, 51010 Tartu
  • Museum
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    Lossi 25, 51003 Tartu
  • University of Tartu Natural History Museum and Botanical Garden
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    Faculty address: 
    Vanemuise 46, 51003 Tartu
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    Faculty address: 
    Narva mnt 18, 51009, Tartu
  • University Office in Tallinn
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    Faculty address: 
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  • Estates Office
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    Ülikooli 18a, 51005 Tartu
  • Finance Office
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    Lossi 3, III floor, 51003 Tartu
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Ott Kangur "Nocturnal water relations and predawn water potential disequilibrium in temperate deciduous tree species"

Date: 
17.08.2020 - 12:00

On 17 August at 12:00 Ott Kangur will defend her doctoral thesis "Nocturnal water relations and predawn water potential disequilibrium in temperate deciduous tree species".

Supervisors:
Prof. Arne Sellin, University of Tartu, Estonia
 

Opponent: 
​Prof. Sandra J. Bucci, National University of Patagonia San Juan Bosco and Institute of Biosciences of Patagonia (CONICET), Argentina  

Summary:
Plants are usually studied during daytime when photosynthesis and intensive water exchange between the plant and the environment takes place. However, nocturnal and predawn water relations of plants have also gained considerable attention during recent decades. Nevertheless, there are still uncertainties what factors and how may affect characteristics like nocturnal sap flow, nocturnal and predawn stomatal conductance, and predawn leaf water potential – a characteristic commonly used for estimating soil water status. The aim of this thesis was to compare nocturnal stomatal conductance and predawn water potential disequilibrium between leaf and soil (PDD) in temperate deciduous tree species differing in ecological demands and life strategies; to elucidate the environmental factors that govern nocturnal transpiration and PDD; and to test whether increasing daytime atmospheric humidity – a climate trend predicted for high northern latitudes – affects nocturnal water use in broadleaved trees. An experiment in nine temperate tree species in a greenhouse demonstrated that under ample soil water availability, fast-growing pioneer species exhibited higher night-time stomatal conductance compared to slow-growing late-successional species. That was true about the species originating from more humid and cooler regions (e.g. Populus tremula, Betula pendula, Alnus glutinosa). In drought conditions the differences in stomatal conductance between the species disappeared. Field studies carried out in Estonia proved the occurrence of significant PDD and nocturnal sap flow in hybrid aspen (Populus tremula × P. tremuloides). Positive effect of nocturnal atmospheric evaporative demand on both characteristics is a solid proof of open stomata at night. This suggests that under drier and warmer atmospheric conditions predawn leaf water status cannot be used as a reliable estimate of soil water status. Our experiments proved that hybrid aspen trees are able to absorb dew water from leaf surface, exhibiting foliar water uptake, which might also bias predawn leaf water status. In a growth chamber experiment, hybrid aspen saplings grown under elevated air humidity responded with increased sap flux density to a rise in atmospheric evaporative demand at night, which evidences weakened stomatal control over water loss, although the field studies did not support that finding. Taking into account the regional and global climate trends, it is very likely that the proportion of nocturnal water losses in total daily transpiration of trees as well as the necessity for considering nocturnal transpiration in calculations of landscape or ecosystem water balance will increase in the future.

Location: 
Lai 40–218 and via videobridge
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