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| Cadmium tolerance and proline accumulation in Rorippa globosa (Turcz.) Thell. |
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Abstract Changes in the biomass, contents of malondialdehyde (MDA), chlorophyll and free proline in the Cd-hyperaccumulator Rorippa globosa (Turcz.) Thell., in particular, the relationships of free proline with Cd accumulation were investigated using pot-culture experiments and compared with a closely related species Rorippa islandica. Application of Cd significantly increased the content of free proline in both R. globosa and R. islandica. There was a significant increase in the level of free proline in leaves of R. globosa treated with 10 and 25μg/g Cd. Moreover, there were no change in biomass of R. globosa leaves, the level of MDA and the content of chlorophyll compared with the control. It could be thus suggested that free proline might play an important role against oxidative stress caused by Cd. The results of the correlation analysis indicated that free proline in roots of R. globosa and in whole tissues of R. islandica might act as the indication of Cd hyperaccumulation.
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Received: 02 August 2008
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