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Allelopathic potential of watermelon tissues and root exudates |
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| Authors: | ZP Hao Q Wang P Christie XL Li |
| Institution: | 1. Key Laboratory of Plant Nutrition, Ministry of Agriculture, China Agricultural University, Beijing 100094, China;2. Key Laboratory of Plant–Soil Interactions, Ministry of Education, China Agricultural University, Beijing 100094, China;3. Department of Plant Nutrition, College of Agricultural Resources and Environmental Sciences, China Agricultural University, Beijing 100094, China;4. College of Agronomy and Biotechnology, China Agricultural University, Beijing 100094, China;5. Agricultural and Environmental Science Department, Queen''s University Belfast, Newforge Lane, Belfast BT9 5PX, UK |
| Abstract: | Allelopathic potential of watermelon in hydroponic culture was investigated using the continuous root exudates trapping system (CRETS). Laboratory bioassays and high-performance liquid chromatography (HPLC) were used for quantification of phytotoxins in different plant tissues and root exudates collected using XAD-4 resin. Seedling growth of both watermelon and lettuce was significantly inhibited by watermelon root exudates and the degree of inhibition increased with increasing concentration of exudates. Root exudates had inhibitory effects throughout the experiment and these were most pronounced during the period 41–50 days after transplanting. Inhibitory effects of various plant tissues were demonstrated using the bioassay tests. Frulic acid was the dominant component found using HPLC and the amounts of allelochemicals found in the plant extracts were correlated with the bioassay results using the Petri dish test. The results indicate that the allelopathic potential of watermelon may play an important role in the phenomenon referred to as ‘soil sickness’. |
| Keywords: | Allelopathy Watermelon Autotoxicity Soil sickness Phenolic compounds |
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