Predawn leaf conductance depends on previous day irradiance but is not related to growth in aspen saplings grown under artificially manipulated air humidity
Priit Kupper
A B , Ants Kaasik A , Mai Kukumägi A , Gristin Rohula-Okunev A , Linda Rusalepp A and Anu Sõber A
+ Author Affiliations
- Author Affiliations
A Institute of Ecology and Earth Sciences, University of Tartu, 51005 Tartu, Estonia.
B Corresponding author. Email: priit.kupper@ut.ee
Functional Plant Biology - https://doi.org/10.1071/FP20254
Submitted: 18 August 2020 Accepted: 17 November 2020 Published online: 8 December 2020
Abstract
Recent studies have suggested that predawn stomatal opening may enhance early-morning photosynthesis (A) and improve the relative growth rate of trees. However, the causality between night-time stomatal conductance, A, and tree growth is disputable because stomatal opening in darkness can be mediated by previous day photosynthate loads and might be a consequence of growth-related processes like dark respiration (R). To identify linkages between night-time leaf conductance (gl_night), A, R, and tree growth, we conducted an experiment in hybrid aspen saplings grown under different air relative humidity (RH) conditions and previous day irradiance level (IR_pday). Predawn leaf conductance (gl_predawn) depended on RH, IR_pday and R (P < 0.05), whereas early-morning gross A (Agross_PAR500) depended on IR_pday and gl_predawn (P < 0.001). Daytime net A was positively related to Agross_PAR500 and leaf [N] (P < 0.05). Tree diameter and height increment correlated positively with gl at the beginning and middle of the night (P < 0.05) but not before dawn. Although our results demonstrate that gl_night was related to tree growth, the relationship was not determined by R. The linkage between gl_predawn and Agross_PAR500 was modified by IR_pday, indicating that daily CO2 assimilation probably provides feedback for stomatal opening before dawn.
Keywords: CO2 assimilation, dark respiration, light intensity, predawn, photosynthesis, stomatal conductance, tree growth characteristics.
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