Root water flow and leaf stomatal conductance in aspen ( Populus tremuloides ) seedlings treated with abscisic acid

Planta ◽  
2001 ◽  
Vol 213 (5) ◽  
pp. 741-747 ◽  
Author(s):  
Xianchong Wan ◽  
Janusz J. Zwiazek
Keyword(s):  
Abscisic Acid ◽  
Stomatal Conductance ◽  
Water Flow ◽  
Populus Tremuloides

scholarly journals Accumulation of Silicon and Changes in Water Balance under Drought Stress in Brassica napus var. napus L.

Plants ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 280
Author(s):  
Diana Saja-Garbarz ◽  
Agnieszka Ostrowska ◽  
Katarzyna Kaczanowska ◽  
Franciszek Janowiak
Keyword(s):  
Abscisic Acid ◽  
Drought Stress ◽  
Stomatal Conductance ◽  
Water Balance ◽  
Water Content ◽  
Oilseed Rape ◽  
Potential Evapotranspiration ◽  
Leaf Water Content ◽  
Optimal Conditions ◽  
Abscisic Acid Level

The aim of this study was to investigate the accumulation of silicon in oilseed rape and to characterize the changes in chosen water balance parameters in response to drought. The following parameters were estimated: water content, osmotic and water potential, evapotranspiration, stomatal conductance and abscisic acid level under optimal and drought conditions. It was shown that oilseed rape plants accumulate silicon after its supplementation to the soil, both in the case of silicon alone and silicon together with iron. It was revealed that silicon (without iron) helps maintain constant water content under optimal conditions. While no silicon influence on osmotic regulation was observed, a transpiration decrease was detected under optimal conditions after silicon application. Under drought, a reduction in stomatal conductance was observed, but it was similar for all plants. The decrease in leaf water content under drought was accompanied by a significant increase in abscisic acid content in leaves of control plants and those treated with silicon together with iron. To sum up, under certain conditions, silicon is accumulated even in non-accumulator species, such as oilseed rape, and presumably improves water uptake under drought stress.

scholarly journals Interactions between leaf water potential, stomatal conductance and abscisic acid content of orange trees submitted to drought stress

2004 ◽  
Vol 16 (3) ◽  
pp. 155-161 ◽  
Author(s):  
Mara de Menezes de Assis Gomes ◽  
Ana Maria Magalhães Andrade Lagôa ◽  
Camilo Lázaro Medina ◽  
Eduardo Caruso Machado ◽  
Marcos Antônio Machado
Keyword(s):  
Abscisic Acid ◽  
Water Stress ◽  
Stomatal Conductance ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Acid Content ◽  
Stomatal Closure ◽  
Leaf Water ◽  
Orange Trees ◽  
Abscisic Acid Content

Thirty-month-old 'Pêra' orange trees grafted on 'Rangpur' lemon trees grown in 100 L pots were submitted to water stress by the suspension of irrigation. CO2 assimilation (A), transpiration (E) and stomatal conductance (g s) values declined from the seventh day of stress, although the leaf water potential at 6:00 a.m. (psipd) and at 2:00 p.m. (psi2) began to decline from the fifth day of water deficiency. The CO2 intercellular concentration (Ci) of water-stressed plants increased from the seventh day, reaching a maximum concentration on the day of most severe stress. The carboxylation efficiency, as revealed by the ratio A/Ci was low on this day and did not show the same values of non-stressed plants even after ten days of rewatering. After five days of rewatering only psi pd and psi2 were similar to control plants while A, E and g s were still different. When psi2 decreases, there was a trend for increasing abscisic acid (ABA) concentration in the leaves. Similarly, stomatal conductance was found to decrease as a function of decreasing psi2. ABA accumulation and stomatal closure occurred when psi2 was lower than -1.0 MPa. Water stress in 'Pera´ orange trees increased abscisic acid content with consequent stomatal closure and decreased psi2 values.

scholarly journals Abscisic acid in leaves and roots of willow: significance for stomatal conductance

2001 ◽  
Vol 21 (11) ◽  
pp. 759-764 ◽  
Author(s):  
L. Liu ◽  
A.J. S. McDonald ◽  
I. Stadenberg ◽  
W. J. Davies
Keyword(s):  
Abscisic Acid ◽  
Stomatal Conductance ◽  
Leaves And Roots

The effect of ectomycorrhizae on water relations in aspen (Populus tremuloides) and white spruce (Picea glauca) at low soil temperatures

2002 ◽  
Vol 80 (6) ◽  
pp. 684-689 ◽  
Author(s):  
Simon M Landhäusser ◽  
Tawfik M Muhsin ◽  
Janusz J Zwiazek
Keyword(s):  
Stomatal Conductance ◽  
Soil Temperature ◽  
Water Uptake ◽  
Water Relations ◽  
Populus Tremuloides ◽  
Picea Glauca ◽  
White Spruce ◽  
Hydraulic Conductance ◽  
Root Hydraulic Conductance ◽  
Soil Temperatures

Low soil temperatures, common during the growing season in northern forests, have the potential to impede plant growth. In this study, water uptake, water relations, and growth characteristics were examined in aspen (Populus tremuloides) and white spruce (Picea glauca) seedlings that were inoculated with ectomycorrhizal fungi and grown at 20°C daytime air temperatures and low soil temperatures of 4°C and 8°C. Mycorrhizal associations had little effect on root and shoot biomass at both soil temperatures. Root hydraulic conductance (Kr) was higher in both mycorrhizal plant species compared to nonmycorrhizal plants, but there was no soil temperature effect on Kr in either species. Mycorrhizae also increased shoot water potential (Ψw) in Populus tremuloides but had no effect on Ψw in Picea glauca. The increases in Kr and Ψw were not reflected by changes in stomatal conductance (gs) and transpiration rates (E), suggesting that the reduction of water flow in seedlings exposed to low soil temperature was not likely the factor limiting gs in both plant species.Key words: boreal forest, root hydraulic conductance, root growth, stomatal conductance, water uptake.

scholarly journals Stomatal conductance and xylem-sap abscisic acid (ABA) in adult oak trees during a gradually imposed drought

1996 ◽  
Vol 53 (2-3) ◽  
pp. 207-220 ◽  
Author(s):  
MB Triboulot ◽  
ML Fauveau ◽  
N Bréda ◽  
P Label ◽  
E Dreyer
Keyword(s):  
Abscisic Acid ◽  
Stomatal Conductance ◽  
Xylem Sap ◽  
Oak Trees

Mefluidide-induced drought resistance in seedlings of three conifer species

1993 ◽  
Vol 71 (8) ◽  
pp. 1087-1092
Author(s):  
Salim N. Silim ◽  
Robert D. Guy ◽  
Denis P. Lavender
Keyword(s):  
Abscisic Acid ◽  
Stomatal Conductance ◽  
Plant Growth ◽  
Drought Resistance ◽  
Picea Glauca ◽  
Cold Hardiness ◽  
Net Photosynthesis ◽  
Thuja Plicata ◽  
Red Cedar ◽  
Thuja Plicata Donn

Short-term effects of the plant growth retardant mefluidide on drought resistance were investigated in seedlings of western red cedar (Thuja plicata Donn), yellow cedar (Chamaecyparis nootkatensis D. Don), and white spruce (Picea glauca (Moench) Voss). Mefluidide was applied as a root drench at concentrations of 0, 0.1, and 0.4 mg∙L−1. Following this, seedlings were stressed by withholding water for a period of up to 7 days and then watering regularly thereafter. Stomatal conductance of the mefluidide-treated seedlings decreased significantly and remained lower than the control seedlings throughout the stress period. As a result of the decreased conductance, shoot water potentials in mefluidide-treated seedlings remained higher throughout the stress period. There was a decrease in net photosynthesis that was partially caused by stomatal limitations, the severity of which depended upon the concentration of mefluidide applied. Mefluidide treatment also resulted in an accumulation of abscisic acid in all three species, and this may have been responsible for the effects on stomatal conductance and water relations. In contrast, the mefluidide-treated seedlings had the highest rates of photosynthesis after rewatering, resulting primarily from a promotion of stomatal opening. Key words: stomatal conductance, water potential, photosynthesis, plant growth inhibitors, abscisic acid, cold hardiness.

scholarly journals Effect of exogenously application selected phytohormonal substances on the physiological and morphological indicators of Philadelphus x hybrid in containers

2012 ◽  
Vol 60 (8) ◽  
pp. 109-118
Author(s):  
Martin Jonáš ◽  
P. Salaš ◽  
T. Baltazár
Keyword(s):  
Abscisic Acid ◽  
Chlorophyll Fluorescence ◽  
Stomatal Conductance ◽  
Chlorophyll Content ◽  
Significant Influence ◽  
Woody Plants ◽  
Stress Factors ◽  
Morphological Parameters ◽  
Physiological Indicators ◽  
The Impact

The experiment was established in order to eliminate the effect of stress factors acting on woody plants cultivated in containers. The timber Philadelphus x hybrid ’Mont Blanc’. The timber was in 1.5 l containers. The experiment was evaluated effect of exogenouse application of phytohormonal substances on select physiological indicators (stomatal conductance, chlorophyll fluorescence and chlorophyll content), were measured three times during the vegetation. Morphological indicators (diameter of root neck, total length of shoots and number of shoots), were evaluated at the end of vegetation. Phytohormones affecting the impact of stress on plants were used for the purpose. Abscisic acid, 24- epibrassinolid, kinetin and spermine were applied by spraying the leaf in three concentrations (0.01 mg.l−1, 0.1 mg.l−1 a 1 mg.l−1). In the results were found highly significant differences compared to controls with other variants, especially in the evaluation of physiological parameters. The most significant influence on the stomatal conductance was observed in the variants treated with abscisic acid. Application 24- epibrassinolid significantly increased the chlorophyll content in comparison with control variant. Morphological parameters reached the best results in variants treated with 24- epibrassinolid and spermine.

scholarly journals Arabidopsis mutant dnd2 exhibits increased auxin and abscisic acid content and reduced stomatal conductance

2019 ◽  
Vol 140 ◽  
pp. 18-26
Author(s):  
Liga Kale ◽  
Ilva Nakurte ◽  
Pirko Jalakas ◽  
Laura Kunga-Jegere ◽  
Mikael Brosché ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Stomatal Conductance ◽  
Acid Content ◽  
Arabidopsis Mutant ◽  
Abscisic Acid Content
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