Leaf acid phosphatase isozymes in the diagnosis of phosphorus status in field-grown wheat
1987
McLachlan, K.D. | De Marco, D.G. | Garran, J.H. (Commonwealth Scientific and Industrial Research Organization, Canberra (Australia). Div. of Plant Industry) | Elliott, D.E. (South Australian Dept. of Agriculture, Adelaide (Australia). Northfield Research Lab.)
This study examined the inorganic and total phosphorus in wheat plant tops, along with the phosphatase activity and the phosphatase isozymes occurring in the youngest fully expanded leaves. The inorganic or total phosphorus concentration, or content per plant, could be related to plant and grain yield, but values relative to phosphorus deficiency varied between different stages of growth and between sites. Relationships with inorganic phosphorus were no better than those with total phosphorus. Leaf acid phosphatase assays were a better measure, providing similar values relative to plant deficiency between sites, between seasons and irrespective of whether current or residual phosphorus was the source, but the values varied with plant age. The phosphatase zymograms identified an isozyme which appeared when plants were deficient in phosphorus. It did not appear when they were adequately supplied. The isozyme appeared at all stages of growth to anthesis, and from late tillering through to heading was related to grain yield at both sites, in both seasons and whether freshly applied or residual phosphorus was the source of supply.
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