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| Effect of cadmium on the physiological changes of Clerodendrum bungei Steud. |
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| DOI：10.16768/j.issn.1004-874X.2018.04.014 |
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| Abstract: |
| In order to determine the effect of cadmium on the physiological changes of Clerodendrum bungei
seedlings，field experiment was conducted with 5 Cd concentrations as 0，0.1，0.3，0.6，0.9 mmol/L. Based on
chlorophyll fluorescence parameters，malondialdehyde（MDA） content，proline content，soluble sugar content
and soluble protein content measarements. The results showed that potential photochemical efficiency（Fv/Fo） and
chemical quenching coefficient（qP） declined with Cd2+ concentration increased，the highest rate of inhibition was
43.10% and 37.82%，while non-photochemical quenching coefficient（ qN） gradually increased by 48.13%. Low
concentration Cd2+ had promotion effect on the contents of soluble sugar and soluble protein，but high concentration
of Cd2+ had an significant inhibitory effect. With the Cd2+ stress concentration increased，the contents of MDA and
proline in leaves of Clerodendrum bungei increased by 39.01%，73.07%. MDA content changed significantly at
high concentration，which increased up to 45.29%. There results suggested that the plant might somewhat adapt to
cadmium stress，by adjusting its own the photosynthetic characteristics and osmatic adjustment substance. |
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