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| Effects of spent mushroom substrate polysaccharide on rice seed germination under copper stress |
| Received:September 18, 2019 |
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| KeyWord:copper ion;spent mushroom substrate polysaccharide;stress;rice;germination |
| Author Name | Affiliation | E-mail | | ZHAO Ze-wen | Jiangxi Engineering Laboratory for the Development and Utilization of Agricultural Microbial Resources/College of Biological Sciences and Engineering, Jiangxi Agricultural University, Nanchang 330045, China | | | YANG Zheng-ning | Jiangxi Engineering Laboratory for the Development and Utilization of Agricultural Microbial Resources/College of Biological Sciences and Engineering, Jiangxi Agricultural University, Nanchang 330045, China | | | WAN Lin | Jiangxi Engineering Laboratory for the Development and Utilization of Agricultural Microbial Resources/College of Biological Sciences and Engineering, Jiangxi Agricultural University, Nanchang 330045, China | | | CHENG Xin | Jiangxi Engineering Laboratory for the Development and Utilization of Agricultural Microbial Resources/College of Biological Sciences and Engineering, Jiangxi Agricultural University, Nanchang 330045, China | xincheng@jxau.edu.cn |
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| Abstract: |
| To investigate the effect of soaking seeds of agrocybe cylindracea spent mushroom substrate(ACSMS)polysaccharides on the growth and development of rice under copper ion stress, hydroponic experiments were conducted to study the effects of different concentrations(1, 10, 100, 1000 mg·L-1, and 2000 mg·L-1)of ACSMS polysaccharides on rice seed germination and the related physiological and metabolic indices under copper stress. The results showed that with an increase in copper ion concentration in nutrient solutions, the toxic effect of rice seeds was increased, the germination potential and germination rate of rice seeds were inhibited, and the root length became shorter; in addition, the plasma membrane was damaged under copper stress. The relative conductivity and the malondialdehyde(MDA) content in rice seeds were increased, and the antioxidant enzyme(catalase(CAT), peroxidase(POD), superoxide dismutase(SOD))activity was decreased. The addition of different concentrations of ACSMS polysaccharides alleviated the toxic effect of rice seeds exposed to copper stress, and the germination potential and germination rate of rice seeds were increased. This effect was particularly obvious in rice germ roots. Simultaneously, the addition of ACSMS polysaccharides could repair damage to the plasma membrane and reduce the content of MDA, soluble sugar, and soluble protein in the rice seeds. In conclusion, this study indicated that ACSMS polysaccharides could effectively alleviate the adverse effects of copper stress on rice seed germination. |
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