

FOLLOWUS
1.Marine Biology Institute of Shandong Province, Qingdao 266104, China
2.Qingdao Macroalgae Engineering Technology Research Center, Qingdao 266104, China
WU Haiyi, wuhaiyi1997@163.com
GUO Wen, guowen1963@126.com
收稿:2017-02-24,
录用:2017-5-18,
网络首发:2017-04-17,
纸质出版:2018-05
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吕芳, 丁刚, 刘玮, 等. Comparative study of responses in the brown algae
Fang LÜ, Gang DIND, Wei LIU, et al. Comparative study of responses in the brown algae
吕芳, 丁刚, 刘玮, 等. Comparative study of responses in the brown algae
Fang LÜ, Gang DIND, Wei LIU, et al. Comparative study of responses in the brown algae
Heavy metal pollution in aquatic system is becoming a serious problem worldwide. In this study
responses of
Sargassum thunbergii
to
different
concentrations (0
0.1
0.5
1.0 and 5.0 mg/L) of zinc (Zn) and cadmium (Cd) exposure separately were studied for 15 days in laboratory-controlled conditions. The results show that the specific growth rates increased slightly under the lower Zn concentration treatment (0.1 mg/L) at the first 5 d and then decreased gradually
which were significantly reduced with the exposure time in higher Zn concentrations and all Cd treatments compared to respective control
especially for 1.0 and 5.0 mg/L Cd. Chlorophyll
a
contents showed significant increase in 0.1 mg/L Zn treatment
whereas the gradually reduction were observed in the other three Zn treatments and all Cd treatments. The oxygen evolution rate and respiration rate presented distinct behavior in the Zn-treated samples
but both declined steadily with the exposure time in Cd treatments. The P/R value analyses showed similar variation patterns as chlorophyll a contents. Real-time PCR showed that lower Zn concentration (0.1 mg/L) increased mRNA expression of
rbc
L gene
whereas higher Zn concentrations and Cd reduced the
rbc
L expression. Taken together
these findings strongly indicate that Zn and Cd had different effects on
S. thunbergii
both at the physiological and gene transcription levels
the transcript level of photosynthesis-related gene
rbc
L can be used as an useful molecular marker of algal growth and environment impacts.
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