Abstract
Seven-day-old maize (Zea mays) plants were grown hydroponically for ten days in N-deprived nutrient solution. The distribution profiles according to the position on the stem of the –N laminas stomatal conductance, transpiration rate, photosynthetic rate (1st-group) were monitored, along with the corresponding profiles of dry mass, water amount, water content, length, surface area, and specific surface area (2nd-group), relative to control. In the uppermost –N laminas, the changes within a parameter of the 1st-group were significantly higher and of the 2nd-group significantly lower than the control, respectively. Correlations of the corresponding values among the parameters of the 1st-or 2nd-group were linear. The parameters between groups correlated non-linearly. Transpiration rate was divided by the lamina’s dry mass correlated with surface area in a power-type function. The slopes of the response ratios linear relations between the various pairs of parameters could be used for simulation of a lamina’s response to the deprivation.
Highlights
The exchange of gases by a plant is regulated by the opening and closing of stomata
An analysis of the kinetics of several key physiological parameters of maize plants during the onset of N-deficiency has been conducted in order to elucidate how stomatal conductance, transpiration rate and water dynamics are distributed relative to lamina position in response to this nutrient stress
Transpiration rate, and photosynthetic rate constituted a group of parameters in which the negative impact due to deprivation was located in the lower laminas (1st group)
Summary
The exchange of gases by a plant is regulated by the opening and closing of stomata. Transpiration through sto-How to cite this paper: Bouranis, D.L., et al (2014) Distribution Profiles and Interrelations of Stomatal Conductance, Transpiration Rate and Water Dynamics in Young Maize Laminas under Nitrogen Deprivation. Apart from transpirational water loss (E), stomatal aperture regulates gas exchange, and eventually photosynthetic rate (A). The decrease of A in plants via hydraulic or hormonal signals is an indirect mode of action of nutrients on photosynthesis [1]. Effects of N-deficiency on plant’s stomatal behaviour, hydraulic performance and water relations have been described; nitrate deficiency can induce stomatal closure and can cause reductions in leaf growth rates [2]-[5]. Whether stomatal closure and diminished hydraulic conductivity are the primary effects of nutrient-stress response has been discussed [6]. Nutrient deficiency can regulate gs via the supply alteration of guard cells with root- or leaf-sourced hormones, such as abscisic acid and cytokinines. The hormonal signals affect stomatal conductance and the lamina’s gas exchange
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