Effects of Aquatic Extract from Chrysanthemum's Rhizospheric Soil on the Seed Germination and Root Enzymes

in HortScience
Authors:
Kai ZhouNanjing Agricultural Univ., Dept. of Ornamental Horticulture, Nanjing, Jiangsu, 210095, P.R. China

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Weiming GuoNanjing Agricultural Univ., Dept. of Ornamental Horticulture, Nanjing, Jiangsu, 210095, P.R. China

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Zhongchun Jiang*State Univ. of New York at Cobleskill, Dept. of Plant Science, Cobleskill, NY 12043

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The autointoxication of chrysanthemum was studied using water extract of Dendranthema morifolium's rhizospheric soil. Results of bioassays showed that the water extract inhibited chrysanthemum seed germination and the activities of some important root enzymes. The seedling nitrate reductase activity was decreased linearly with increasing concentration of the extract. The activity of root dehydrogenase was inhibited only at the highest concentration tested [3.2 g·mL-1, dry weight (DW)], but was stimulated at a lower concentration tested (1.6 g·mL-1, DW). Malondialdehyde content increased at higher than 1.6 g·mL-1, DW concentrations of the extract. The autointoxication phenomenon might be related to the difficulties in continuous plantings of chrysanthemum at the same location.

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