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Chromium phytoextraction and physiological responses of the hyperaccumulator Swartz to plant growth-promoting

《环境科学与工程前沿（英文）》 2023年第17卷第1期 doi: 10.1007/s11783-023-1609-0

摘要：

● Improved Cr phytoextration efficiency was achieved by B. cereus inoculation.

关键词： Hexavalent chromium Hyperaccumulator Rhizobacteria Leersia hexandra Swartz Bacillus cereus Consortia

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Subcellular distribution and chemical form of Pb in hyperaccumulator

Yanqun ZU,Yuan LI,Huan MIN,Fangdong ZHAN,Li QIN,Jixiu WANG

《环境科学与工程前沿（英文）》 2015年第9卷第2期页码 250-258 doi: 10.1007/s11783-014-0643-3

摘要： Solution culture was conducted in order to understand accumulation characteristics and chemical forms of Pb in ( ) and the response of root exudates to Pb addition. The results showed that: 1) Pb contents in the shoot and root of increased with increasing in Pb concentrations in solution. 2) The contents of Pb chemical forms under Pb addition followed as: HAc extractable fraction (F )>HCl extractable fraction (F )>NaCl extractable fraction (F )>ethanol-extractable fraction (F )>water extractable fraction (F ). 3) Increased Pb level in the medium caused increases in Pb contents in the four subcellular fractions of shoots and roots, with most accumulation in FIV (Fraction IV, soluble fraction) in shoots and FI (Fraction I, cell wall fraction) in roots. 4) Contents of soluble sugar and free amino acid of root exudates increased with increasing Pb concentration in solution. Significantly positive correlations between Pb and contents of soluble sugar and free amino acid were observed. 5) With Pb concentrations in solution, low molecular weight organic acids (LMWOAs) contents followed the tendency: tartaric acid>acetic acid>malic acid>citric acid. Significantly positive correlation was observed between Pb and citric acid contents. The results indicate that soluble sugars, free amino acid and citric acid in root exudates of facilitate the absorption and accumulation of Pb, which exist in NaCl-, HCl- and HAc- extractable Pb forms, FI and FIV fractions, resulting in tolerance of to Pb.

关键词： Pb Arenaria orbiculata chemical forms subcellular distribution root exudates hydroponic culture

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Growth responses of the newly-discovered Cd-hyperaccumulator Rorippa globosa and its accumulation characteristics

SUN Yuebing, ZHOU Qixing, WEI Shuhe, REN Liping

《环境科学与工程前沿（英文）》 2007年第1卷第1期页码 107-113 doi: 10.1007/s11783-007-0020-6

摘要： has been identified as a newly-found Cd-hyperaccumulating species. In the present study, growth responses of and its accumulation characteristics of Cd and As were examined under joint stress of Cd and As. The results showed that Cd and As had an antagonistic effect on enhancing the growth of plants and Cd uptake and accumulation under the low concentration Cd and As treatments. When the concentration of Cd in the soil was 10 mg/kg and the concentration of As was 50 mg/kg, the highest growing height of the plant was up to 35.9 cm and the dry weight of the shoots was up to 2.2 g/pot, respectively. Meanwhile, the accumulation of Cd in the leaves under the joint stress was higher than that at the same level under single Cd pollution. However, there were synergic adverse effects on plant growth and Cd uptake under the combined pollution from a high concentration of Cd and As. Meanwhile, the accumulation of As in the roots was greater than that in the shoots, the translocation factor (TF) was "d0.3 and the bioaccumulation factor (BF) was "d0.6, thus showing that had an excluding effect on As uptake. These results confirmed that had a strong tolerant ability to the joint stress of Cd and As, and the potential for phytoremediation of soils contaminated by Cd and As.

关键词： synergic adverse stress present study potential weight