Abstract
Supplying Mn to wheat plants grown under Mn-deficient conditions or growing Mn-efficient wheat genotypes reduces take-all. The effects of Mn fertilization on accumulation of macro- and micronutrients by four wheat genotypes differing in Mn-efficiency were studied. Wheat plants were grown in Mn-deficient Wangary sand and were infected with isolates of Gaeumannomyces graminis vartritici (Walker) (Ggt) fungus of varying virulence. Plants from different treatments had Mn status ranging from severe deficiency to luxury levels and contained different concentrations of other nutrients. Mn fertilization increased the rate of Mn accumulation 9-fold, but reduced accumulation rates of Zn, Cu, and Na irrespective of Ggt infection, and of Ca, Mg, K, P, S, and Fe especially in the control, uninfected plants. Take-all infection reduced total root dry weight only slightly, indicating differences in nutrient accumulation rates were due to specific changes in root physiology caused by infection. Mn-efficient genotypes accumulated Zn, Cu, Mg, K, P, and S at a lower rate than Mn-inefficient genotypes. The benefits of Mn fertilization through reduced incidence and severeity of take-all should be weighed against reduced accumulation of other nutrients.
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