Effects of Calcium and Magnesium of Nutrient Solution on Their Composition in Leaves of Tomato Seedlings

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  • トマト幼植物葉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
  • トマト ヨウショクブツ ヨウチュウ ノ カルシウム ト マグネシウム ガンユウリ

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Abstract

Quantitative analysis was undertaken for the interaction of calcium and magnesium in uptake by tomato seedling leaves. Tomato seedings were raised by aerated solution culture technique with nutrient solution added 5, 10, 15, 20, 25 meq/l of calcium chloride or magnesium chloride. The culture solution for calcium or magnesium series contained magnesium or calcium of 12 meq/l, respectively. At 2nd and 4th weeks, Ca, Mg, and K concentrations (meq/100g dry weight) in the leaves of each treatment were determined. Potassium and magnesium concentrations of the leaves were decreased by the addition of calcium to the nutrient solution. Calcium concentration was reduced by the addition of magnesium but K concentration was not affected much. Ratios between the decrement of Mg (ΔMg, meq/100g dry weight) and the increment of Ca concentration (ΔCa, meq/100g dry weight), ΔMg/ΔCa, were calculated for each treatment, ΔK/ΔCa, ΔCa/ΔMg, and ΔK/ΔMg were also calculated. Repression values were obtained as an average of the values for 10, 15, 20, 25 meq/l treatments of each element. The higher the value had risen, the stronger the repression of the uptake. At 2nd week of the culture, repression values of Ca for Mg and K were 0.47 and 0.76, and the values of Mg for Ca and K were 10.69 and 0.34, respectively. The repression value of Mg for Ca uptake was the highest. Though the values changed according to the age of the plants, the highest value was obtained with Mg for Ca uptake at 4th week of the culture.

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