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Alleviation of chromium toxicity in rice seedlings by applying exogenous glutathione 总被引:1,自引:0,他引:1
Boyin Qiu Fanrong Zeng Shengguan Cai Xiaojian Wu Shamsi Imran Haider Feibo Wu Guoping Zhang 《Journal of plant physiology》2013
The effect of exogenous reduced glutathione (GSH) on alleviation of hexavalent chromium (Cr6+) toxicity to rice seedlings and its physiological mechanisms were comprehensively investigated in a series of experiments. Our results showed that growth and nutrient uptake of rice seedlings were dramatically reduced under 100 μM Cr6+ stress, and the reduction was significantly alleviated by exogenous GSH. Cr6+ stress also reduced cell viability in root tips and damaged ultrastructure of both chloroplasts and root cells, while the addition of GSH alleviates those negative effects. Cr-induced toxicity and GSH-caused Cr alleviation differed significantly between Cr-tolerant Line 117 (L117) and Cr-sensitive Line 41 (L41). Under Cr6+ stress, cystine content was increased and GSH content was decreased in rice plants, exogenous GSH, however, mitigated the Cr-toxicity by reversing the Cr-induced changes of the two compounds. The types of Cr-induced secretion of organic acids varied between the genotypes, where reduction in the contents of acetic and lactic acids and tartaric and malic acids were observed in L117 and L41, respectively. The addition of GSH alleviated the reduction of secretion of these organic acids. Exogenous GSH also altered the forms of Cr ions in the rhizosphere and the fraction of distribution at subcellular level in both shoots and roots. It may be concluded that the alleviation of Cr6+ toxicity by exogenous GSH is directly attributed to its regulation on forms of Cr ions in rhizosphere and their distribution at subcellular levels. 相似文献
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CHEN Tongbin HUANG Zechun HUANG Yuying & LEI Mei Laboratory of Environmental Remediation Institute of Geographic Sciences Natural Resources Research Chinese Academy of Sciences Beijing China Laboratory of Synchrotron Radiation Institute of High Energy Physics Chinese Academy of Sciences Beijing China 《中国科学:生命科学英文版》2005,48(1):18-24
The distributions of arsenic and 6 essential elements in the pinna of As hyperac-cumulator, Pteris vittata L., were studied using synchrotron radiation X-ray fluorescence (SRXRF). Significant correlation between the distribution and mobility of the elements revealed that SRXRF study on the elemental distribution was feasible to inspect the transportations of elements in plants. The distribution of As in the pinna showed that As had great abilities to be transported in xylem vessels and from xylem to mesophyll. The distribution of K, one of the most mobile elements in plants, was similar to that of As, whereas the distributions of Fe and Ca with less mobility in plants were almost opposite to that of As in the pinna. 相似文献
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Zhang F Liu N Zhao X Zuo A Yang L Xu Q Wang X Huang Y He W Chai Z 《Biological trace element research》2002,90(1-3):227-237
Iodine deficiency (ID) can result in irreversible damage to the brain during the fetal and neonatal stages. As the active
center of many enzymes, trace elements play essential roles in brain function. In this work, the relative contents and distributions
of elements (Cl, Br, Fe, Cu, and Zn) in two important brain regions, the cerebral cortex and hippocampus, of the iodine-deficient
model rats were determined by the synchrotron radiation X-ray fluorescence (SRXRF) method. Meanwhile, the ID rats were supplemented
with adequate and excessive iodine, respectively. The results indicated that the distributions of trace elements could be
influenced by the different iodine intakes in the stage of brain development. In contrast to the control group, the contents
of Cl, Br, and Zn in two brain regions showed a significant increase in the ID group; however, both Fe and Cu decreased in
the cerebral cortex and increased in the hippocmapus in the ID group. In addition, only slight changes of elemental contents
in brain were found between the adequate and excessive iodine-supplemented rats. 相似文献
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Distributions of arsenic and essential elements in pinna of arsenic hyperaccumulator Pteris vittata L. 总被引:1,自引:0,他引:1
The distributions of arsenic and 6 essential elements in the pinna of As hyperaccumulator, Pteris vittata L., were studied using synchrotron radiation X-ray fluorescence (SRXRF). Significant correlation between the distribution and mobility of the elements revealed that SRXRF study on the elemental distribution was feasible to inspect the transportations of elements in plants. The distribution of As in the pinna showed that As had great abilities to be transported in xylem vessels and from xylem to mesophyll. The distribution of K, one of the most mobile elements in plants, was similar to that of As, whereas the distributions of Fe and Ca with less mobility in plants were almost opposite to that of As in the pinna. 相似文献
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