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

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Water retention curve and calculating where wilting occurs
The lower temperature and high relative humidity slowed down the deteriorative processes including wilting and yellowing.
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Thus, the results obtained show no disease symptoms and plants shown healthy and without wilting symptoms (Plank 03 and 04).
Wilting in the remaining 6 avocado trees that were assayed was presumably due to factors other than laurel wilt as these trees were not infected by R.
Two catchments--the Copely and Collinwgood catchments--are of particular concern, says Wilting. While these two upper catchments were already separated at the outset of the project, they flow into one of the GVRD's oldest combined trunk sewers at China Creek.
Wilting and the stunted growth associated with it were more severe in plants with larger amounts of peroxidase, Lagrimini and his collaborators report in the January PLANT CELL.
Fungus was isolated by standard tissue isolation method from the pigeonpea plants showing wilting symptoms collected from the farmers' fields.
In field conditions, the typical wilting can appear within 3-4 weeks after sowing, if the variety is susceptible (Haware, 1990).
Wilting at earlier growth stage causes more loss than at lateral phase of growth and seeds harvested from wilted plants looks lighter and duller than those from healthy plants (Ahmad et al.
In response to the apparent increasing problems of water shortage and drought in many parts of the world, we reexamine two of the key factors that contribute to plant wilting: the ability of the soil to transport water to plant roots, and the ability of the roots to absorb the transported water.
Loss of TNC during wilting caused the level of TN in wilted forage to be more similar across cutting times within each harvest, although a trend of decreasing TN with later cutting times was still present (Tables 1 to 3).