Center of Environment Ecology and Soil and Water Conservation, Chinese Academy of Sciences, Institute of Soil and Water Conservation, Northwest Sci-Tech University of Agriculture and Forestry, Yangling, Shaanxi 712100, China.
Acta Botanica Boreali Occidentalia Sinica
The experiment adopted hydroponic culture, biological testing and laboratory determination to study the allelopathic effects ofroot exudates and extracts of C. moschata seedlings under the stresses of different macroelements (N, P, K, Ca, Sand Mg) on C. moschata seedlings. C. moschata had autotoxicity and the stresses of different macroelements had inhibiting effects on the growth of its radic1es and plumule. Different nutritious conditions exerted different impacts on its root exudates and the proper combination of nutritious elements could alleviate its autotoxicity. Organic substances extracted with ethyl acetate trom the exudates of C. moschata roots also showed inhibiting effects on the growth of C. moschata radic1es but to a higher extent. There existed allelopathic substances in water-extracted solutions of the roots taken at the seedling stage, which inhibited the growth of C. moschata seedlings. Screening the optimal macroelement combination at which the exudates of C. moschata roots showed the least inhibition effect on the growth of its seedling would provide the basis for C. moschata mechanism in response to nutrition stresses.
