Turgor


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turgor

[′tər·gər]
(botany)
Distension of a plant cell wall and membrane by the fluid contents.

Turgor

 

the state of tension of cell membranes that is caused by the osmotic pressure of the intracellular fluid (P int), the osmotic pressure of the external solution (P ext), and the resilience of the cell membrane. In animal cells, except for the cells of some Coelenterata, this resilience is generally minimal. Most animal cells lack turgor and maintain their integrity only in isotonic or near-isotonic solutions; in these cells the difference between the P int and the P ext is less than 0.5–1.0 atm.

In living plant cells, the P int is always greater than the P ext, but the cell membrane does not rupture owing to the presence of a cellulose cell wall. The difference between the P int and the P ext in such plants as halophytes and fungi reaches 50–100 atm, but even then the cell wall’s reserve of strength amounts to 60–70 percent. In most plants the relative elongation of the cell membrane that results from turgor does not exceed 5–10 percent, and the turgor pressure is in the range of 5–10 atm. Turgor gives plant tissues resilience and strength. All stages of autolysis, fading, and aging are accompanied by a decline in turgor.

V. V. KABANOV

References in periodicals archive ?
Then, plants were rehydrated and reevaluated with respect to gas exchanges, when the leaves recovered turgor, which occurred between 3 and 4 days after the restart of irrigation.
2009) including restriction of water supply losing leaf water potential and turgor.
Leaf water potential (Psw), osmotic potential (Pss) and leaf turgor pressure (Psp) remained statistically significant (P0.
62 (Ab) Table 2 - Turgor Loss Point (TLP), Maximum Symplastic Water Fraction (Ws %), Cellular Elasticity Module (s) and Relative Water Content at the turgor loss point (RWC at TLP %), from conventional (CONV) and transgenic (RR) cultivar plants subjected to the two irrigation regimes (100% and 40%).
Such a favorable effect of OA on yield and its components could presumably be attributed to the well-established role of OA in maintaining turgor and plant growth under water deficit as observed in various crops (Jones and Turner, 1980; Wright and Smith, 1983; Morgan and Condon, 1986; Blum, 1989; Morgan, 1995; Grammatikopoulos, 1999).
A falta de agua reduz a pressao de turgor e, consequentemente, o fluxo de seiva pelos vasos condutores (Taiz & Zeiger, 2009), fato que tende a diminuir o elongamento celular e, assim, o crescimento e o desenvolvimento das plantas.
Moisture###Hybrids###Plant height Leaf area per plant Water potential###Osmotic potential Turgor potential RSD (%)
Soil salinity may induce drought stress due to an increase in extracellular solute concentration which may cause a decline in water potential resulting in loss of cellular turgor (Taiz et al.
This project (DILIPHO) hypothesizes that under low turgor the exchange of metabolites slows down, thus jamming the C4 machinery.
This occurs because the water stress causes reduced turgor of the guard cells of the stomata, which is followed by closing of the stomatal pore (Silva, Soares, Oliveira, & Magalhaes, 2001).
sound; turgor potential, membrane potential, temperature, light, touch,
Integumentary: Skin warm and dry to touch without lesions and/or cuts and brisk skin turgor.