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In the greenhouse, plants were imposed irrigation with three water salinities; 0.4, 4.0, and 8.0 dSm with different sub-treatments of nutrient applications. Wheat yield was negatively correlated with soil salinity, presenting threshold at 6 dsm followed by yield reduction with slope 7.4 % per unit dsm. Salt stress decreased Mg-ATP activity from 0.32 to 0.28 μmole Pi min -1 mgchl. Application of mixed fertilizers M.F. (compost, Gypsum, P, and K) for the non stressed plants resulted in increasing both Mg-ATPase from 0.32 to 0.40 and the relative grain yield to 120%, suggesting anabolic metabolism. At soil salinity above the threshold level, application of nutrients sharply increased Mg-ATPase activity up to 1.06 μmole Pi min -1 mgchl accompanying yield reduction; suggesting catabolic metabolism. In the field experiment, the soil salinity was 12.3 dSm at planting and only drainage water (EC 3.9 dSm) was available for irrigation. The soil EC steeply reduced to 5.0 dSm before the productive growth stages. Mg-ATPase activity was up-regulated at flowering and was low late in the season at the grain filling stage. Foliar spray with K and a biostimulant enhanced ATPase activity as well as grain yield compared to the control. Under the field condition Mg-ATPase activity was correlated with the grain yield, which reached 8.7 Mg ha.

Changes in Yield and Chloroplast Mg2+-ATPase Activity of Wheat (Triticum aestivum L.) in Response to Soil Salinity and Nutrient Supply