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| Effects of different amendments on seed germination and cadmium uptake and accumulation in rice seedlings under cadmium stress |
| Received:June 11, 2018 |
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| KeyWord:rice;cadmium;melatonin;sodium silicate;sodium molybdate dihydrate;orthoboric acid |
| Author Name | Affiliation | E-mail | | WANG Bing-shuo | School of Geography and Environmental Science, Guizhou Normal University, Guiyang 550001, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | HUANG Yi-zong | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | yizonghuang@126.com | | LI Juan | School of Geography and Environmental Science, Guizhou Normal University, Guiyang 550001, China | | | LONG Jian | Guizhou Provincial Key Laboratory for Information System of Mountainous Areas and Protection of Ecological Environment, Guizhou Normal University, Guiyang 550001, China | | | WANG Nong | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | HUANG Yong-chun | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | |
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| Abstract: |
| The effects of four amendments on seed germination and Cd uptake and accumulation in rice under Cd stress were compared by seed germination and solution culture tests. The results showed that the addition of boric acid, melatonin, sodium molybdate, and sodium silicate promoted the germination of rice seeds and growth of rice seedlings under Cd stress. In the 5 μmol·L-1 Cd concentration treatment group, the addition of 1 mg·L-1 boric acid, 10 μmol·L-1 melatonin, 0.5 mg·L-1 sodium molybdate, and 1 mmol·L-1 sodium silicate increased rice seed germination rate by 11.1%, 10%, 11.1%, and 10%, respectively, and the germination potential by 17.8%, 17.8%, 17.8%, and 22.2%, respectively, compared with those of the CK. Simultaneously, the addition of these four kinds of amendments reduced Cd concentration in rice in both the seed germination and solution culture tests. When subjected to 5 μmol·L-1 Cd stress, the addition of boric acid, melatonin, sodium molybdate, and silicic acid significantly decreased Cd concentration in rice roots and shoots. The concentration of Cd in rice roots and shoots decreased by 38.6%~51.3% and 36.9%~41.1% during seed germination, respectively. In the solution culture experiment, under 1 μmol·L-1 Cd concentration stress, the addition of boric acid, melatonin, molybdate, and sodium silicate reduced the Cd concentration in rice roots by 32.6%, 38.3%, 47%, and 72.5% (8 d), respectively, compared with that of the control treatment. Moreover, under 5 μmol·L-1 Cd stress, the addition of sodium silicate significantly decreased the Cd translocation from rice root to leaf. The effect of sodium silicate on Cd concentration in rice was the most obvious, followed by sodium molybdate, melatonin, and boric acid. |
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