CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2022, Vol. 44 ›› Issue (6): 1286-1295.doi: 10.19802/j.issn.1007-9084.2021267

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Allelopathy of Brassica napus straw aqueous extract on germination and growth of rice

Zi-xiang ZOU1,2(), Ying LIU1,2, Ding-gang ZHOU1,2,3(), Li-li LIU1,2,3, Da-wei ZHANG1,2,3, Jin-feng WU1,2,3, Mei LI4, Ming-li YAN1,2,3()   

  1. 1.College of Life Sciences, Hunan University of Science and Technology, Xiangtan 411201, China
    2.Hunan Key Laboratory of Economic Crops Genetic Improvement and Integrated Utilization, Hunan University of Science and Technology, Xiangtan 411201, China
    3.Key Laboratory of Ecological Remediation and Safe Utilization of Heavy Metal-Polluted Soils, Hunan University of Science and Technology, Xiangtan 411201, China
    4.Crop Research Institute, Hunan Academy of Agricultural Sciences, Changsha 410125, China
  • Received:2021-10-22 Online:2022-12-25 Published:2022-11-24
  • Contact: Ding-gang ZHOU,Ming-li YAN E-mail:251886102@qq.com;dgzhoucn@163.com;ymljack@126.com


In order to explore the effect of Brassica napus straw on rice in the oil-rice cropping system, Fengyou 737, Xiangzayou 553 and Zhongshuang11, three rape cultivars were selected to prepare the straw aqueous extract with different concentrations ( 0, 25%, 50% and 75%), the germination and growth of two rice seeds(Wuyou 308 and C Liangyou 343)were investigated, and the results suggested that rape straw aqueous extract increased the rice seedling height and fresh weight generally. Meanwhile, rape straw aqueous extract affected the germination ratio, seedling root length of rice in a concentration-dependent way. The germination ratio, germination index of rice seeds and seedling root length were increased at low-concentration of 25%, but decreased at the higher-concentrations of 50% and 75%. As the concentration increased, the aqueous extract of Xiangzayou 553 increased the soluble protein content and significantly reduced the activity of superoxide dismutase (T-SOD) and peroxidase (POD) of Wuyou308 seedlings. In C Liangyou 343 seedlings, the T-SOD and POD activity significantly increased while the protein content greatly decreased; at 25% concentration, the malondialdehyde (MDA) content also noticeably decreased. The aqueous extract of Zhongshuang 11 at 75% concentration increased the MDA content and decreased the POD activity of Wuyou 308 seedlings. Fengyou 737 at 25% concentration greatly decreased the soluble protein content of C Liangyou343 seedlings but increased the activity of T-SOD and POD. In conclusion, the higher the concentration of the rape straw aqueous extract, the stronger its allelopathic effects on rice germination and seedling growth. However, allelopathic effects of extracts from different rape varieties on different rice varieties were different. Our study suggested that the combination of Fengyou 737 and Wuyou 308 is more suited for an oil-rice system.

Key words: Brassica napus, straw, aqueous extract, seed germination, seedling growth

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