Effects of Calcium and Magnesium of Nutrient Solution on Their Composition in Leaf Blade of Corn Seedlings

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  • トウモロコシ幼植物葉身中のカルシウムとマグネシウム含有率に及ぼす水耕培地中のこれら塩基の相互作用
  • トウモロコシ ヨウショクブツ ヨウシンチュウ ノ カルシウム ト マグネシウム

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Abstract

Competitive nature between calcium and magnesium absorption in corn (Zea mays L.) seedling was analysed quantitatively. the seedings were raised with aerated nutrient solutions containing calcium chloride or magnesium chloride of 0.5, 1.0, 1.5, 2.0 and 2.5 mmol L^<-1> ; calcium series and magnesium series for 4 weeks. The former series contained magnesium chloride and latter contained calcium chloride at 1.5 mmol L^<-1>. After 3 or 4 weeks of culture, the leaf blade, stem and root of the seedlings were analyzed for calcium and magnesium contents. In the calcium series, calcium content increased a little and magnesium content decreased as the calcium concentrations in the nutrient solution were increased. In the magnesium series, magnesium content (ΔCa) in leaf blade grown with a certain calcium concentration was obtained by reducing the calcium content of the leaf blade grown with 0.5 mmol L^<-1> of the element. The reduction of tissue magnesium content (ΔMg) in the tissue was obtained by reducing the magnesium content of the tissue of each pot from the content of the tissue from 0.5 mmol L^<-1>. The average of the ratios, ΔMg/ΔCa was defined as "repression effect" of calcium against magnesium absorption. the values of 18.93±9.31 and 13.42±8.74 for the leaf blades of the 3rd and 4th week were obtained, respectively. The value for magnesium against calcium was calculated in a similar manner. The value of 0.69±0.58 and 0.15±0.05 for the leaf blade of 3rd and 4th week were obtained, respectively. A larger repression effect of calcium for magnesium absorption was obtained. Magnesium had a larger effect on calcium absorption of tomato seedling as reported previously. This contrast may be attributed to the difference in the calcium content in the tissues.

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