Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 45, Issue 3, Pages 1082-1087Publisher
AMER CHEMICAL SOC
DOI: 10.1021/es102647w
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Funding
- National Science Foundation
- Environmental Protection Agency [EF 0830117]
- USDA [2008-38422-19138]
- UT System
- Toxicology Unit of the BBRC (NIH NCRR) [2G12RR008124-16A1]
- NSF [CHE-0840525]
- Direct For Biological Sciences [0830117] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0840525] Funding Source: National Science Foundation
- Div Of Biological Infrastructure [0830117] Funding Source: National Science Foundation
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This report shows, for the first time, the effectiveness of the phytohormone kinetin (KN) in increasing Cr translocation from roots to stems in Mexican Palo Verde. Fifteen-day-old seedlings, germinated in soil spiked with Cr(III) and (VI) at 60 and 10 mg kg(-1), respectively, were watered every other day for 30 days with a KN solution at 250 mu M. Samples were analyzed for catalase (CAT) and ascorbate peroxidase (APDX) activities, Cr concentration, and Cr distribution in tissues. Results showed that KN reduced CAT but increased APOX in the roots of Cr(VI)-treated plants. In the leaves, KN reduced both CAT and APOX in Cr(III) but not in Cr(VI)-treated plants. However, KN increased total Cr concentration in roots, stems, and leaves by 45%, 103%, and 72%, respectively, compared to Cr(III) alone. For Cr(VI), KN increased Cr concentrations in roots, stems, and leaves, respectively, by 53%, 129%, and 168%, compared to Cr(VI) alone. The electron probe microanalyzer results showed that Cr was mainly located at the cortex section in the root, and Cr distribution was essentially homogeneous in stems. However, proven through X-ray images, Cr(VI)-treated roots and stems had more Cr accumulation than Cr(III) counterparts. KN increased the Cr translocation from roots to stems.
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