Physiological responses of hydroponically-grown Tagetes patula as affected by cadmium
Journal
Taiwanese Journal of Agricultural Chemistry and Food Science
Journal Volume
48
Journal Volume
48
Journal Issue
6
Journal Issue
6
Pages
310-316
Start Page
310
End Page
316
ISSN
16052471
Date Issued
2010-12
Author(s)
Abstract
Tagetes patula, a popular garden species, is a newly discovered Cd-hyperaccumulator with the advantages of broad environmental adaptablilty, high biomass and high accumulating capability to Cd. To investigate the physiological changes to Cd, hydroponic culture system was developed. Expose of plants to 5 and 10 μM CdCl2 for 14 days results in accumulation of 250 and 400 mg Cd kg-1 Cd in leaves, respectively. Both 5 and 10 μM CdCl2 treatments did not show toxic effects on fresh weight, dry weight, chlorophyll content, and root length. In contrast, plants dramatically accumulated Cd with a maximum of 5363 mg Cd kg-1 after 14 days exposure at 50 μM CdCl2. The toxic effect caused by Cd was evident by the growth inhibition of root, chlorosis, increase of malondialdehyde (MDA) and root cell death. Moreover, cross sections of the root tissues revealed that Cd toxicity led to shrink and dehydrate phenotype of root tissues when plants were treated with 50 μM CdCl2. Taken together, T. patula is tolerant to low concentration of Cd (10 μM) in the hydroponic system, and its accumulation of Cd is higher than the standard of hyperaccumulator in shoot tissue.
Subjects
Cadmium
Hydroponics
Hyperaccumulator
Phytoremediation
Tagetes patula
Type
journal article