Responses of different water spinach cultivars and their hybrid to Cd, Pb and Cd-Pb exposures.
A pot experiment was conducted to investigate the stability of Cd and/or Pb accumulation in shoot of Cd and Pb pollution-safe cultivars (PSCs), the hereditary pattern of shoot Cd accumulation, and the transfer potentials of Cd and Pb in water spinach (Ipomoea aquatica Forsk.). A typical Cd-PSC, a typical non-Cd-PSC (Cd accumulative cultivar), a hybrid from the former two cultivars, and two typical Cd+Pb-PSCs were grown in seven soils with different concentrations of Cd and Pb. The results showed that concentrations of Cd and Pb in shoot of the PSCs were always lower than the non-PSC and the highest Cd and Pb transfer factors were also always observed in the non-PSC, indicating the stability of the PSCs in Cd and Pb accumulation. Shoot Cd concentration seemed to be controlled by high Cd dominant gene(s) and thus crossbreeding might not minimize Cd accumulation in water spinach. Interaction between Cd and Pb in soils affected the accumulations of the metals in shoot of water spinach. Under middle Cd and Pb treatments, the presence of higher Pb promoted the accumulation of Cd. However, under high Pb treatment, accumulations of Cd and Pb were both restricted.
Xin
Junliang
J
State Key Laboratory for Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China.
Huang
Baifei
B
Yang
Zhongyi
Z
Yuan
Jiangang
J
Dai
Hongwen
H
Qiu
Qiu
Q
D001673:Biodegradation, Environmental; D018533:Biomass; D002104:Cadmium / Q000737:chemistry*; D018556:Crops, Agricultural; D004784:Environmental Monitoring / Q000379:methods*; D004787:Environmental Pollution; D005506:Food Contamination / Q000517:prevention & control*; D019015:Geologic Sediments; D006863:Hydrogen-Ion Concentration; D027741:Ipomoea / Q000378:metabolism; D007854:Lead / Q000737:chemistry*; D019216:Metals, Heavy / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis*; D013696:Temperature; D014867:Water / Q000378:metabolism*
D019216:Metals, Heavy; D012989:Soil Pollutants; D002104:Cadmium; D014867:Water; D007854:Lead