Phosphate Absorption by Plants From Habitats of Different Phosphate Status

Abstract

SUMMARY Whole plants of Urtica and Deschampsia of different phosphate status were used to study phosphate uptake. By contrast with excised roots, the attached roots of the plants showed differences both in the rate of uptake and their patterns of incorporation of phosphate. The rate of phosphate absorption from low concentrations was rather similar for the two species, but from high concentrations, Urtica absorbed at a greater rate. A greater proportion of the absorbed phosphate was incorporated into acid insoluble and acid soluble organic phosphate in Urtica than in Deschampsia. Urtica is more sensitive to phosphate concentration in its total growth rate relative shoot and root growth, and in total uptake than Deschampsia.

The influence of light and nutrient availability on herb layer species richness in oak-dominated forests in central Bohemia

“…Honnay et al 1999;Dumortier et al 2002;De Keersmaeker et al 2004). High soil P concentration stimulates the vigorous growth of FCS, whereas the number of AFS is negatively affected (Nassery 1970;Pigott and Taylor 1964;Pigott 1971). The growth of AFS may also be stimulated by elevated soil P concentrations, but less so than in the case of FCS with vigorous growth (Hipps et al 2005).…”

Growth, Phosphate Absorption, and Phosphorus Chemical Fractions in Two Chionochloa Species

“…In other studies nutrient absorption capacity (absorption rate per unit mass of root measured under standardized conditions) is generally higher or similar in rapidly growing species from fertile habitats than it is in plants from infertile habitats (e.g. Bradshaw et al 1960;Snaydon & Bradshaw 1961;Nassery 1970;Grundon 1972;White 1972;Christie & Moorby 1975;Harrison & Helliwell 1979;Atwell et al 1980;; but see Snaydon & Bradshaw 1962;Andrew 1966;Barrow 1977;Blair & Cordero 1978), indicating that a high nutrient absorption capacity has generally not been an important adaptation to infertile soils. This might be expected, because at low nutrient availability nutrient diffusion to the root surface limits absorption, so even a low nutrient absorption capacity is adequate to absorb those nutrients that reach the root (Nye 1977).…”

Phosphatase Activity of Intact Young Wheat Roots Under Sterile and Nonsterile Conditions

“…in uptake of inorganic phosphate (Bowen and Rovira, 1967;Nassery, 1970). Also, any injury to a root releases considerable phosphatase- Chang and Bandurski (1964) took special precautions to minimize such release for the enzymes they studied-so that activities measured with excised roots might bear little relation to activities affecting the external solution and mediated only by enzyme shown histochemically to be attached to the surfaces of outer cells of the root {Estermann and McLaren, 1961;Hall, 1969).…”