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| Effect of tetracycline on the growth and photosynthesis of flue-cured tobacco |
| Received:May 12, 2016 |
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| KeyWord:tobacco;tetracycline;growth;root to shoot ratio;photosynthesis |
| Author Name | Affiliation | E-mail | | ZHANG Ji-xu | Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China
Qingdao Agricultural University, College of Agronomy and Plant Protection, Qingdao 266109, China | | | SHEN Guo-ming | Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China | | | KONG Fan-yu | Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China | | | ZHANG Zhong-feng | Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China | | | WANG Rui | Enshi Branch of Hubei Tobacco Company, Enshi 445000, China | | | GAO Lin | Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China | | | DAI Yan-chen | Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China | | | ZHENG Jia-yu | Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China | | | ZHANG Ji-guang | Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China | zhangjiguang@caas.cn |
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| Abstract: |
| In order to evaluate the eco-toxicological effects of typical antibiotics residue on tobacco, the effects of tetracycline addition on tobacco growth and photosynthesis were studied via pot experiments. The results showed that during the whole growth period of tobacco, the low amount of tetracycline addition(5 mg·kg-1) could increase the tobacco height. The middle and high amount of tetracycline addition(50 mg·kg-1 and 500 mg·kg-1) had an obvious inhibitory effect on tobacco height, but they promoted the increase of stem circumference and leaf number of tobacco. Furthermore, the low amount of tetracycline addition could promote root length and root volume of tobacco, while the high amount of tetracycline addition inhibited tobacco root growth, and the suppression gradually decreased with the growth stages, with no significant difference on the late growth stage. The root to shoot ratio of tobacco in the tetracycline addition treatments were lower than that in CK during the whole growth period except for the resetting stage, and it decreased with the increase of the amount of tetracycline addition. Tetracycline addition first inhibited then enhanced the photosynthetic rate, stomatal conductance and transpination rate during the tobacco growth period, but its effect on intercellular CO2 concentration had no obvious regularity. These results indicated that tetracycline might have a potential impact on tobacco growth through influencing photosynthesis. Meanwhile, tobacco could adapt the effect of tetracycline by regulating root development and the root to shoot ratio. Therefore, the effects of middle and high amount of tetracycline addition on tobacco growth and photosynthesis showed a certain eco-toxicity, which decreased with the growth stages of tobacco. The specific mechanism of tetracycline on tobacco growth and its risk assessment in tobacco field need to be further studied. |
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