Related Concept Videos
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.
02:04Regulation 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.
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,...
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...
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.
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.
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Related Experiment Video
Updated: Jun 19, 2026
09:23
Lateral Root Inducible System in Arabidopsis and Maize
Published on: January 14, 2016
Auxin homeostasis during lateral root development under drought condition.
1Molecular Signaling Laboratory, Department of Chemistry, Seoul National University, Seoul, Korea.
Plant Signaling & Behavior
|October 15, 2009
Summary
The plant gene MYB96 integrates abscisic acid (ABA) and auxin signals to control lateral root growth, enhancing drought resistance. This discovery offers insights into plant architecture and stress adaptation.
Area of Science:
- Plant Biology
- Molecular Genetics
- Agronomy
Background:
- Lateral root formation is crucial for crop productivity and stress adaptation, influenced by hormones like abscisic acid (ABA) and auxin.
- Environmental factors such as drought and salinity also significantly impact root development.
Discussion:
- MYB96, an R2R3-type MYB transcription factor, acts as a molecular link integrating ABA and auxin signaling pathways.
- ABA signals mediated by MYB96 are incorporated into auxin signaling, affecting GH3 gene expression and auxin homeostasis.
- This crosstalk is particularly important for modulating lateral root development under water deficit conditions.
Key Insights:
- MYB96 overexpression leads to dwarfed growth, reduced lateral roots, and enhanced drought resistance, with elevated GH3 gene expression.
- MYB96 deficiency results in more lateral roots and increased susceptibility to drought stress.
- MYB96 plays a vital role in regulating auxin homeostasis during lateral root development under drought stress.
Outlook:
- MYB96-mediated signaling may also be involved in plant pathogen resistance, which is influenced by cellular water content.
- Understanding MYB96's role can inform strategies for improving crop architecture and stress resilience.
- Further research into MYB96's regulatory network could unlock new avenues for agricultural biotechnology.