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Allelopathic effects of extracts from Jerusalem artichoke tuber on seed germination and growth of Lactuca sativa L.

ZHAO Meng-liang1,2, WANG Zi-ying1, ZHAO Wen-ju1, REN Yan-jing1,2*   

  1. (1Key Laboratory of Vegetable Genetics and Physiology, Qinghai University, Academy of Agriculture and Forestry, Xining 810016, China; 2State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810016, China).
  • Online:2020-07-10 Published:2021-01-09

Abstract: Taking extracts from fresh Jerusalem artichoke tubers, the powder of drying Jerusalem artichoke tubers and inulin as allelochemicals, we measured germination rate, bud length, root length, superoxide dismutase (SOD), malondialdehyde (MDA), and soluble protein to analyze the allelopathic effects of different Jerusalem artichoke tuber extracts on seed germination and growth of lettuce (Lactuca sativa L.). Results showed that at the concentration of inulin solution of 40 mg·mL-1 (T4), germination rate was the highest, being 20.1% higher than that of control. In the next place, germination rate was 9.6% higher than that of control when the extract solution concentration of dry sample was 5 mg·mL-1 (T1). At the solution concentration of 40 mg·mL-1 (T4), dry sample treatment promoted the growth of lettuce seedling’s buds, with a growth rate of 9.2% higher than that of control. When the solution concentration of dry sample was 5 mg·mL-1 (T1), lettuce had the longest roots, being 28.3% higher than that of control. When the concentration of fresh extract of Jerusalem artichoke tuber was 20 mg·ml-1 (T3), SOD activity of lettuce reached the highest, while MDA content was lower than that of control, indicating that the extract from fresh Jerusalem artichoke tuber could effectively improve the resistance of lettuce. When the concentration of inulin solution was 5 mg·ml-1 (T1) and 10 mg·mL-1 (T2), the contents of MDA and protein were significantly lower than that of control. The comprehensive allelopathic effect index was used to analyze the effects of Jerusalem artichoke tuber extract on seed germination of lettuce. The extract solution of both fresh and dry Jerusalem artichoke tubers had positive effects on the germination of lettuce, while that of inulin had strong negative effect. In the actual production, different concentrations of extract solution should be applied according to different growth requirements to achieve the best effect. Our results indicated that the powder of Jerusalem artichoke tuber as allelochemicals could play a more effective role in promoting seed germination and seedling growth of lettuce.

Key words: soil evaporation, crop transpiration, water stress coefficient., solar greenhouse, crop coefficient