Wilting


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Wilting

 

loss of turgor (tension of tissues) by plants due to disruption of the water balance; it occurs when the transpiration of water by leaves exceeds the amount entering the tissues. Wilting is manifested externally by a drooping of the leaves and tops of the stems. Various plant species wilt after different degrees of water loss. Sunflowers and potatoes wilt after a loss of more than 30 percent of the water in the leaves, and some shade-loving plants wilt after a water loss of 2-3 percent.

Wilting may be temporary or prolonged. Temporary wilting (temporary water deficiency) occurs when the water entering from the soil cannot compensate for the amount expended by the plant; but after reduced transpiration—for example, toward evening—the water balance is restored, and the plant returns to normal. Prolonged wilting (residual water deficiency) occurs when there is little or no moisture available to the plant in the soil, and the water balance is not restored even during the night.

As plants wilt, their growth halts, and as dehydration intensifies, photosynthesis is disrupted, the energy efficiency of respiraton diminishes, and starch, proteins, and other high-molecular compounds in the tissues break down, resulting in death of the cells. Wilting in arid regions can be prevented by irrigating, improving the mineral nutrition of the plants, hardening seeds before sowing, and planting drought-resistant varieties.

T. F. KORETSKAIA

References in periodicals archive ?
5 MPa leads to a wrong estimate of the pore water suction at wilting.
Equation 4 shows that for clay contents <28%, plant wilting due to the soil alone would occur at values of h [less than or equal to] 1.
2012) shows that the pore water suction at hydraulic cut-off (where soil-limited plant wilting would occur), as measured by the point of maximum curvature, may be estimated by:
We therefore conclude that the water status at plant wilting is not affected by soil compression provided that the pre-compression stress or pre-drying stress of the micro-aggregates (that contain the textural pores) is not exceeded.
We suggest that future work on plants should include studies of wilting when the roots are immersed in aerated osmotic solutions (e.
It is not a coincidence that the commonly assumed wilting point suction is the same as the greatest value of air pressure that was used in the pressure cell extractors.
The work suggests that there is scope for further research on the wilting of plants.
Briggs LJ, Shantz HL (1912) 'The wilting coefficient for different plants and its indirect determination.
Because of the swirling action, we tend to entrain more of the odors back into the sewage so there's less off-gassing," says Wilting.
Designed by a university professor to the GVRD's specific requirements, the vortex is less unwieldy than other structures, Wilting adds, "because we essentially built the chamber and can lower this device directly into it and can modify it in the future by just pulling it out.
Also unique, says Wilting, is the installation of dynamic gates as part of the $1.
We're using these overshot gates to store the sewage within the pipe," says Wilting.