Nutritional effect of calcium on growth and ionic concentration of wheat undersaline conditions
2002
Ali, A. | Ahmed, I. | Badr-uz-Zaman | Salim, M.,National Agricultural ResearchCentre, Islamabad (Pakistan). Land Resources Research Program
The effects of calcium (6 and 12 mM) supply on plant growth, Na, K and Cauptake of unstressed (0 mM NaCl) and stressed (75 mM NaCl) wheat seedlings(Triticum aestivum cv. Sarsabz) were investigated. Shoot dry matter productionwas significantly (p less than 0.05) lower (58 %) at 75 mM NaCl level than that atcontrol. Elevated calcium (12 mM) supply to the root medium enhanced shootgrowth by 36 % as compared to control. Similarly 53 % reduction in root drymatter yield was recorded at 75 mM NaCl and 43 % yield increase was noted at 12mM Ca level. At 75 mM NaCl + 12 mM Ca level, there was 17 % less sodiumaccumulation in shoot tissues as compared to 75 mM NaCl + 6 mM Ca level while27% reduction in Na concentration in root tissue was observed at 12 mM Ca ascompared to 6 mM Ca level. Relatively higher calcium supply (12 mM) to the rootmedium resulted in 20 % more K concentration. At 75 mM NaCl, 40 % reduction in Kconcentration was found in shoot tissue as compared with control. In root tissue,12 mM calcium supply enhanced K concentration by 58 % as compared to 6 mMcalcium level at both salinity levels. A significant positive correlation (r=0.99)between shoot calcium content and corresponding dry matter yield indicated apositive role of calcium for increasing dry matter yield. Similarly, significantpositive correlation (r=0.99) between shoot K and shoot dry matter yield wasnoticed exhibiting high K accumulation with the increasing dry matter yield.However, a negative correlation (r= - 0.95) between shoot dry matter yield andsodium content in shoot, is indicative of growth inhibition due to increasingsodium contents in shoots.
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