Akhtar Tasneem, Zia-Ur-Rehman Muhammad, Naeem Asif, Nawaz Rab, Ali Shafaqat, Murtaza Ghulam, Maqsood Muhammad Aamer, Azhar Muhammad, Khalid Hinnan, Rizwan Muhammad
Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, Faisalabad, Pakistan.
Department of Arid Land Agriculture, King Abdul Aziz University, Jeddah, Saudi Arabia.
Environ Sci Pollut Res Int. 2017 Feb;24(6):5521-5529. doi: 10.1007/s11356-016-8246-0. Epub 2016 Dec 27.
Cadmium (Cd) is a biologically non-essential heavy metal while the cultivation of Cd-tolerant varieties/hybrids (V) seems the most promising strategy for remediation of Cd-contaminated soils. For this, 24-day-old seedlings of seven maize hybrids, DKC 65-25, DKC 61-25, DKC 919, 23-T-16, 32-B-33, 31-P-41, and Syn hybrid, were grown in hydroponic conditions for 21 additional days in various Cd concentrations (0, 5, 10, and 15 μM). Effects of variety, Cd, and their interaction were highly significant (p ≤ 0.05) for studied plant agronomic and physiological traits except the V × Cd interaction for leaf chlorophyll content, root-shoot length, and root dry weight. The Cd accumulation in root and shoot increased gradually with increasing Cd treatments while copper (Cu), zinc (Zn), and manganese (Mn) uptake was decreased in all hybrids. The reduction in root and shoot biomass and Cd uptake was lower in 32-B-33 and 23-T-16 compared to other hybrids. The highest accumulation of Cu, Zn, and Mn was observed in 32-B-33, DK C65-25, and 31-P-41, respectively. The differential uptake and accumulation of Cd by maize hybrids may be useful in selection and breeding for Cd-tolerant genotypes.
镉（Cd）是一种对生物非必需的重金属，而培育耐镉品种/杂交种似乎是修复镉污染土壤最具前景的策略。为此，将7个玉米杂交种（DKC 65 - 25、DKC 61 - 25、DKC 919、23 - T - 16、32 - B - 33、31 - P - 41和Syn杂交种）24日龄的幼苗在水培条件下于不同镉浓度（0、5、10和15 μM）下再培养21天。除了叶叶绿素含量、根 - 茎长度和根干重的品种×镉互作外，品种、镉及其互作对所研究的植物农艺和生理性状的影响高度显著（p≤0.05）。随着镉处理浓度的增加，根和地上部的镉积累量逐渐增加，而所有杂交种中铜（Cu）、锌（Zn）和锰（Mn）的吸收量均下降。与其他杂交种相比，32 - B - 33和23 - T - 16的根和地上部生物量以及镉吸收量的减少幅度较小。分别在32 - B - 33、DKC65 - 25和31 - P - 41中观察到最高的铜、锌和锰积累量。玉米杂交种对镉的不同吸收和积累可能有助于耐镉基因型的选择和育种。
