water uptake

water uptake

the uptake of water into a plant through the roots. Water only enters the plant if there is a deficit in the XYLEM caused by losses during TRANSPIRATION. The path of water from soil to leaf is as follows:
  1. (a) movement of free soil water into the root hair by OSMOSIS;
  2. (b) across the CORTEX of the root towards the STELE, by one of three methods: (i) via cell walls and intercellular spaces by hydration; (ii) via PLASMODESMATA by CYCLOSIS. (iii) via cell vacuoles by osmosis;
  3. (c) through the endodermis (see CASPARIAN STRIP across the PERICYCLE and into the XYLEM VESSELS. These latter contain ions which are actively pumped into the xylem to raise the concentration of solutes, thus making the osmotic potential more negative;
  4. (d) up the plant in the xylem by a combination of: (i) TRANSPIRATION pull and cohesion-tension (see COHESION-TENSION HYPOTHESIS). (ii) capillarity (iii) ROOT PRESSURE.All water uptake is variable according to the plant, its age, environment and the time of year.
Mentioned in ?
References in periodicals archive ?
The new PPA reportedly shows improved impact strength on par with standard nylon 66 but a lower water uptake than standard aliphatic nylons, resulting in high dimensional stability.
'These crystals increase the hydrophobicity of the concrete - the amount concrete repels the water - which ensures the reduction of water uptake through the pores.
The low water uptake results in a high dimensional stability of the plastic parts in humid environments.
The water uptake study and adsorption behavior of both neat and GNPs filled Nyl 6,6 was also performed.
The county chief, who led a delegation from the World Bank in a tour of the dams where desilting is ongoing, said there were plans to install solar pumps to assist in upstream water uptake.World Bank senior agricultural economist Viney Vutukusu and Jonathan Denison, a water resource and irrigation specialist at the Food And Agriculture Organisation, said the UN agency would continue supporting such initiatives.
It effectively slows down the water uptake of the antifouling, meaning that biocides are released in a more predictable pattern over the lifetime of the coating.
Water uptake of PLGA matrices in spherical shape were studied via immersing the preweighed samples ([W.sub.1]) into 10 mL phosphate buffer (pH 7.4) and then incubated at 37[degrees]C.
The salinity affects seed germination by creating osmotic stress due to reduced water uptake or through ionic imbalance due to toxic effects of sodium (Na +) and chloride (Cl-) ions (Hosseini et al., 2003; Hussain et al., 2018).
"Then the wet May allowed good root growth and water uptake by the vines, and then the wonderful period of sunshine allowed the grapes to develop amid a hearty canopy of leaves."
Post storage vase life and total water uptake measured at alternate day (ml) during the vase life period
When moving the flowers to a vase, re-cut all stems on a slant and slit the end of woody stems to allow water uptake. Remove any leaves, thorns and small flowers that would end up under water.
The Veihmeyer and Hendrickson approach is simply based only on the energy (potential) of soil water and does not consider other soil physical properties or limitations influencing water uptake by plants and root growth in the soil (Asgarzadeh et al.