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| Effect of graphene oxide on seedling growth and physiological characteristics of maize |
| Received:September 21, 2020 |
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| KeyWord:graphene oxide;maize seedling;growth;physiological characteristics;oxidative stress |
| Author Name | Affiliation | E-mail | | ZHAO Lin | Institute of Agriculture and Food Standardization, China National Institute of Standardization, Beijing 100191, China | | | SONG Rui-rui | Institute of Agriculture and Food Standardization, China National Institute of Standardization, Beijing 100191, China | | | WU Qi | Institute of Agriculture and Food Standardization, China National Institute of Standardization, Beijing 100191, China | | | WU Xi | Institute of Agriculture and Food Standardization, China National Institute of Standardization, Beijing 100191, China | | | YUN Zhen-yu | Institute of Agriculture and Food Standardization, China National Institute of Standardization, Beijing 100191, China | yunzy@cnis.ac.cn |
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| Abstract: |
| To investigate the effects of graphene oxide（GO）on the growth and physiological characteristics of maize, maize seedlings were treated with different concentrations of GO in hydroponic experiments. The growth status, root morphology, chlorophyll content, antioxidant enzyme activity, and malondialdehyde（MDA）content of the maize seedlings were determined. After 9 days of culture, GO treatment significantly inhibited the growth of maize seedlings in a concentration-dependent manner. When the GO concentration was 200 mg·L-1, the main root length and the root/shoot ratio decreased by 79.8% and 65.9%, respectively. With increasing GO concentration, chlorophyll content increased initially and then decreased. No significant differences were observed for superoxide-dismutase or peroxidase activities, whereas catalase（CAT）activity and MDA content increased with increasing GO concentration. When the GO concentration was 200 mg·L-1, CAT activity and MDA content increased by 187.5% and 335.6%, respectively. These results indicated that GO treatment induced a certain degree of oxidative stress on maize seedlings, which affected various physiological and biochemical indices, thus promoting root morphological changes and inhibiting their growth and development. This inhibitory effect was more significant at high GO concentrations. |
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