Abstract:
:The aim was to determine cadmium (Cd) speciation in various plants, between buffer-soluble and acid-soluble Cd, and also within the buffer-soluble Cd. A better understanding of Cd speciation shows the relative importance of different biological mechanisms for Cd sequestration. Roots of Pistia stratiodes, Eichhornia crassipes, Agrostis gigantea, Deschampsia caespitosa and wheat Triticum turgidum var. durum were analyzed. Buffer extractions solubilized varying proportions of Cd, ranging from 12% in Eichhornia to 83% in Agrostis. The proportion increased with time of Cd exposure in Pistia. It also increased in wheat roots as the external Cd rose from 0.05 to 0.5 muM and was lowest in old leaves and highest in roots. The remaining Cd was extractable with acid. Gel filtration resolved buffer-soluble Cd into three peaks distinct from inorganic Cd. Two complexes with phytochelatins and related polythiols were present in all cases, inorganic Cd being prominent only in Eichhornia extracts. The phytochelatin complexes accounted for 2% of the root Cd in Eichhornia to 78% in Agrostis. In wheat, phytochelatins bound 82% of the Cd in roots, 19% in young leaves and 12% in old leaves. The cysteine-rich protein metallothionein from wheat was detected immunologically in the void volume of gel filtrations of old and young leaves, but not of roots, and was distinct from the two phytochelatin-based complexes. Speciation of Cd in the various plants indicated that phytochelatins were not necessarily the major ligands of Cd.
journal_name
Physiol Plantjournal_title
Physiologia plantarumauthors
Marentes E,Rauser WEdoi
10.1111/j.1399-3054.2007.00960.xsubject
Has Abstractpub_date
2007-10-01 00:00:00pages
291-301issue
2eissn
0031-9317issn
1399-3054pii
PPL960journal_volume
131pub_type
杂志文章abstract::Short- and long-term drought stress on photosystem II (PSII) and oxidative stress were studied in Arabidopsis thaliana. Under drought stress, chlorophyll (Chl) content, Chl fluorescence, relative water content and oxygen evolution capacity gradually decreased, and the thylakoid structure was gradually damaged. Short-t...
journal_title:Physiologia plantarum
pub_type: 杂志文章
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pub_type: 杂志文章,评审
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journal_title:Physiologia plantarum
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doi:10.1111/j.1399-3054.2007.01036.x
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journal_title:Physiologia plantarum
pub_type: 杂志文章
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pub_type: 杂志文章,评审
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pub_type: 杂志文章,评审
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更新日期:2014-12-01 00:00:00
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journal_title:Physiologia plantarum
pub_type: 杂志文章
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更新日期:2020-08-01 00:00:00