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Adaptations that Reduce Water Loss

Adaptations that Reduce Water Loss

Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.

Aquaporins

Aquaporins

Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.

Responses to Drought and Flooding

Responses 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.

Regulation of Transpiration by Stomata

Regulation 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.

Xylem and Transpiration-driven Transport of Resources

Xylem and Transpiration-driven Transport of Resources

The xylem of vascular plants distributes water and dissolved minerals that are taken up by the roots to the rest of the plant. The cells that transport xylem sap are dead upon maturity, and the movement of xylem sap is a passive process.

Tonicity in Plants

Tonicity 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.

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Updated: Jul 18, 2025

Measuring the Osmotic Water Permeability Coefficient Pf of Spherical Cells: Isolated Plant Protoplasts as an Example

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Published on: October 8, 2014

Exploring aquaporin functions during changes in leaf water potential.

Caitlin S Byrt¹, Rose Y Zhang¹, Isobel Magrath¹

¹Division of Plant Sciences, Research School of Biology, College of Science, Australian National University, Acton, ACT, Australia.

Frontiers in Plant Science

|August 24, 2023

Summary

This summary is machine-generated.

Aquaporins regulate water movement in plant leaves, impacting humidity crucial for productivity. Understanding their complex regulation is key to improving crop water use and food security.

Keywords:

hydration hydraulic membrane transport solute flux water channel

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Published on: December 19, 2014

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Last Updated: Jul 18, 2025

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Published on: December 19, 2014

Area of Science:

Plant Physiology
Molecular Biology
Biophysics

Background:

Optimal leaf tissue humidity is vital for plant productivity and food security.
Leaf humidity depends on water availability, transpiration, and cell membrane water flux.
Aquaporin proteins facilitate water and solute transport across plant cell membranes.

Purpose of the Study:

To review current understanding of aquaporins' role in regulating leaf humidity.
To identify challenges in studying aquaporin regulation and function in leaf cells.
To suggest future research directions for assessing aquaporins' impact on leaf substomatal cavity humidity.

Main Methods:

Review of recent scientific literature on aquaporins and plant water relations.
Analysis of regulatory mechanisms of aquaporin function (abundance, localization, PTMs, interactions).
Discussion of challenges in resolving aquaporin dynamics in leaf cells under varying water availability.

Main Results:

Aquaporins are key regulators of water flux across plant cell membranes.
Multiple regulatory mechanisms control aquaporin activity, influencing solute and water movement.
Resolving aquaporin's specific contribution to leaf humidity is complex due to dynamic regulation.

Conclusions:

Aquaporins are critical for maintaining leaf humidity and plant water balance.
Further research is needed to elucidate the precise roles and regulation of specific aquaporins in leaf cells.
Understanding aquaporin function is essential for enhancing plant water use efficiency and crop yields.