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| Hydrogen sulfide signaling molecules mediate S-allyl-L-cysteine to regulate cadmium stress in rice |
| Received:September 05, 2024 |
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| KeyWord:rice;cadmium;S-allyl-L-cysteine;hydrogen sulfide;signaling molecule |
| Author Name | Affiliation | E-mail | | HUO Xingyu | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG Yu | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | WANG Changrong | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | QI Lin | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LIU Bin | Agricultural Resource and Environment Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China | | | HUANG Yanfei | Agricultural Resource and Environment Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China | 421284292@qq.com | | HUANG Yongchun | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | nylab@126.com |
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| Abstract: |
| Cadmium（Cd）pollution in paddy soil not only affects the normal growth and development of rice, but also brings potential harm to human health when Cd accumulates in grain. As an important signal molecule, hydrogen sulfide（H2S）plays an important role in the regulation of heavy metal stress in plants. In this study, a hydroponic experiment was used to investigate the potential mechanism of Sallyl-L- cysteine（SAC）, a garlic extract with H2S donor function, in regulating Cd stress in rice. The main rice variety“ZhongZao 35” planted in southern China was selected as the experimental material and sprayed with SAC at series concentration. The results showed that the H2S content in shoots and roots of rice seedlings continued to increase with time after spraying 0.2 mmol·L-1 SAC, which significantly increased by 44.57% and 83.22% after 12 h compared with the control（CK）treatment. The results of fluorescence labeling on the leaves and roots of rice seedlings also showed that the fluorescence intensity of H2S significantly increased by 254.55% and 700.25% compared with CK treatment. The results of L-cysteine desulfurase（LCD）activity showed that the LCD activities in shoot and root of 0.2 mmol·L-1 SAC were significantly increased by 94.17% and 41.05% compared with CK treatment, respectively. After spraying 0.2 mmol·L-1 SAC, the activities of superoxide dismutase（SOD）, peroxidase（POD）and catalase（CAT）in the shoot of rice seedlings were significantly increased by 32.36%, 26.69%, 24.87%, respectively, the activity in the root was significantly increased by 38.61%, 11.99% and 62.93%, respectively, compared with CK treatment. The content of malondialdehyde（MDA）in shoot and root was significantly decreased by 37.37% and 28.54%, respectively. The results showed that when the SAC spraying concentration reached 0.2 mmol·L-1, the Cd contents in shoot and root of rice seedlings were significantly reduced by 18.07% and 46.05%, respectively, compared with CK treatment. In conclusion, SAC spraying triggers the synthesis of H2S signaling molecules and regulates the alleviation of Cd stress in rice. |
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