| In this study, allelopathy of the water extracts and volatiles of Caryaillinoensis(Wangench.) K. Koch and Carya cathayensis Sarg. were studied. Allelopathiceffects on Robinia pseudoacacia, Raphanus sativus, Lolium multiflorum were evaluated.Juglone was extracted, and identified and its content determined by chloroform thermal refluxand high performance liquid chromatography (HPLC). The results showed as follows:1. Water extracts and volatiles of two CaryaNutt species inhibited the germination rate,root length and seedling height of the three receptors, but the degree of inhibition is different.Most of the suppression degree of the root length is greater than that of the seedling height.2. Water extracts and volatiles of two CaryaNutt species reduced the activity of peroxidase(POD), hyperoxide mutase (SOD) of the three receptors. However, the content ofmalondiadehyde (MDA) of three receptors was increased.3. The results of allelopathic synthetic effect showed that Carya illinoensis(Wangench.) K.Koch had stronger allelopathy than that of Carya cathayensis Sarg. with the processing of thewater extracts and volatiles; but the allelopathy on the three receptors appeared selectivity. Themagnitude order of suppression degree of the water extracts of Carya illinoensis(Wangench.)K. Koch and Carya cathayensis Sarg. on the three receptors was Raphanus sativus, Loliummultiflorum, and Robinia pseudoacacia. The magnitude order of suppression degree of thevolatiles of Carya illinoensis(Wangench.) K. Koch was Raphanus sativus, Lolium multiflorum,and Robinia pseudoacacia. The magnitude order of suppression degree of the volatiles of Caryacathayensis Sarg. were Lolium multiflorum, Raphanus sativus, and Robinia pseudoacacia.4. Juglone was extracted, and identified and its content was determined with chloroformthermal reflux and high performance liquid chromatography (HPLC). The content of Juglone inCarya illinoensis(Wangench.) K. Koch is higher than that of Carya cathayensis Sarg.. |
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