期刊
JOURNAL OF PLANT NUTRITION
卷 35, 期 1, 页码 142-164出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/01904167.2012.631674
关键词
manganese toxicity; magnesium deficiency; Tagetes erecta; bronze-speckle disorder
The iron-manganese (Fe-Mn) disorder in marigold (Tagetes erecta L.) is related to high Mn and low magnesium (Mg) in leaves. Three solution-culture experiments with marigold were conducted in a greenhouse. One investigated Mn and the disorder. Based on dry matter production, 4.5 mg Mn/L was the toxicity concentration and gave 880 mg Mn g(-1) dry weight in new leaves and 1200 in old leaves. Manganese above 4.5 mg L-1 produced bronzed speckles on leaves. A second experiment investigated Mg and the disorder. Based on dry matter production, 10 mg Mg L-1 was the deficiency concentration and gave 1.5% Mg in the shoots. Symptoms of Mg deficiency did not resemble those of the disorder. A third experiment investigated Mn and Mg. Leaf chlorosis appeared at 2.5 mg Mn L-1 with the lowest supply of Mg. These experiments suggest that Mn supply is related to the disorder but increasing Mg does not alleviate the problem.
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