Root secreted acid phosphatase kinetics as a physiological marker for phosphorus deficiency

Phosphate Deficiency Affects Acid Phosphatase Activity and Growth of Two Wheat Varieties

“…Recently, George et al (2008) even indicated that APase activity in roots is a rather poor indicator of the plant growth and phosphorus-nutrition under a range of soil conditions. Generally, production of extracellular APases, and secretion from roots, is dependent on environmental conditions, physiological state of the plant, age or root type and architecture (Ascencio, 1997;Haran et al, 2000;Yadav and Tarafdar, 2001;Zebrowska et al, 2008). Gene expression analysis revealed also the transcriptional regulation of APase genes by different factors, including low level of exogenous Pi (Haran et al, 2000;Wasaki et al, 2000;Misson et al, 2005).…”

Secreting portion of acid phosphatase in roots of Lupin (Lupinus albusL.) and a key signal for the secretion from the roots

“…It is considered that many plants are able to secrete acid phosphatase (APase; EC 3.1.3.2) from roots when grown under phosphate-deficient conditions (Tadano and Sakai 1991;Ascencio 1997;Li et al 1997). Organic phosphate compounds account for 20 to 80% of total phosphorus in soils (Richardson 1994).…”

Plant Analyses and Interpretation

“…Acid phosphatase found in the leaves was found to confirm visual P deficiencies in maize or corn (Elliott and Lauchli, 1986), tomato (Kaya et al, 2000), and wheat (Guthrie et al, 1991). Roots of P-deficient plants also have a higher phosphatase activity (Szabonagy et al, 1987;Ascencio, 1994Ascencio, , 1997Dracup et al, 1984). Leaf acid phosphates assays were also better indicators of plant P status and yield than inorganic or total P in field grown wheat (McLachian et al, 1987).…”