Year: 1997
Type: article
Abstract: summary Zinc, lead and cadmium tolerance in four populations ofTypha latifoliaraised from seed collected from metal‐contaminated and uncontaminated sites were investigated. Metal concentrations in natural plant populations showed that Zn, Pb and Cd in the leaves were maintained at low levels (Zn: 22–122, Pb: 4.7–40 and Cd: 0.2–0.8 μg g−1d. wt), although concentrations of these metals in the associated soil‐sediments (total concentrations of Zn: 86–3009, Pb: 26–18894 and Cd: 1.4–26 μg−1d. wt) and in the roots (Zn: 46–946, Pb: 25–3628 and Cd: 1.0–17 μg g−1d. wt) varied widely. Some differences were found between metal‐contaminated and uncontaminated populations in terms of metal uptake under controlled conditions. Seedlings from metal‐contaminated populations accumulated considerably more metals (up to nearly twice as much Zn and Pb and three times as much Cd) in roots than the uncontaminated population in a pot trial. In general, however, different populations ofT. latifoliashowed similar growth responses (the longest leaf elongation, the longest root elongation, shoot and root d. wt), metal uptake and indices of metal tolerance when seedlings were grown in the same metal treatment solutions or in the same metal‐contaminated media under laboratory conditions. The data do not support the hypothesis that populations from metal‐contaminated sites have evolved tolerance to Zn, Pb and Cd, but rather thatT. latifoliashows constitutional tolerance.
Source: New Phytologist
Authors: Z. H. YE, A. J. M. BAKER, M. H. WONG, A. J. WILLIS
Institutions: Hong Kong Baptist University, University of Sheffield
Language: English
Topic: Heavy metals in environment
Subfield: Pollution
Field: Environmental Science
Domain: Physical Sciences
Open Access status: bronze
Funder: Hong Kong Baptist University
OpenAlex ID: W2141471216