Stomatal conductance of differentially salinized plants
M B Kirkham1, W R Gardner, G C Gerloff
1Department of Soil Science and Department of Botany, University of Wisconsin, Madison, Wisconsin 53706.
Plant Physiology
|March 1, 1972
Summary
Plants with half their roots in saline solutions showed intermediate stomatal conductance. This finding is crucial for understanding plant responses to salinity stress in agriculture.
Area of Science:
- Plant physiology
- Agricultural science
- Environmental stress biology
Background:
- Salinity stress negatively impacts plant growth and development.
- Understanding plant responses to salinity is vital for crop production.
Purpose of the Study:
- To investigate the effect of partial root-zone salinization on stomatal conductance in bean and barley.
- To determine if partial salinity exposure leads to an intermediate physiological response.
Main Methods:
- Daily measurement of stomatal resistance using a diffusion porometer over four weeks.
- Cultivating bean (Phaseolus vulgaris) and barley (Hordeum vulgare) with roots split between saline and non-saline nutrient solutions.
Main Results:
- Stomatal conductance in plants with half roots in saline solutions was measurably lower than in non-saline controls.
- Stomatal conductance was higher in partially salinized plants compared to those with all roots in saline solutions.
- This indicates a physiological adaptation or signaling response to partial salinity stress.
Conclusions:
- Partial salinization of the root zone induces an intermediate stomatal response in plants.
- This suggests plants can integrate signals from both saline and non-saline root zones to regulate stomatal conductance.
- Findings have implications for developing salt-tolerant crops and optimizing irrigation strategies in saline environments.
Related Concept Videos
00:53Tonicity in Plants
Tonicity describes the capacity of a cell to lose or gain water. It depends on the quantity of solute that does not penetrate the membrane. Tonicity delimits the magnitude and direction of osmosis and results in three possible scenarios that alter the volume of a cell: hypertonicity, hypotonicity, and isotonicity. Due to differences in structure and physiology, tonicity of plant cells is different from that of animal cells in some scenarios.Plants and Hypotonic EnvironmentsUnlike animal cells,...
02:34Water and Mineral Acquisition
Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
02:04Regulation of Transpiration by Stomata
During photosynthesis, plants acquire the necessary carbon dioxide and release the produced oxygen back into the atmosphere. Openings in the epidermis of plant leaves is the site of this exchange of gasses. A single opening is called a stoma—derived from the Greek word for “mouth.” Stomata open and close in response to a variety of environmental cues.
02:41Responses to Drought and Flooding
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
02:02Responses to Salt Stress
Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
01:20Tonicity in Plants
Plant cells maintain appropriate osmotic balance in extreme conditions. For instance, plants in dry environments store water in vacuoles, limit the opening of their stoma, and have thick, waxy cuticles to prevent unnecessary water loss. Some species of plants that live in salty environments store salt in their roots. As a result, water osmosis occurs in the root from the surrounding soil.
Tonicity
Tonicity describes the capacity of a cell to lose or gain water depending on the solute...
Tonicity
Tonicity describes the capacity of a cell to lose or gain water depending on the solute...