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ACCUMULATION, CHEMICAL FORMS AND PHYSIOLOGICAL CHARACTERIZATION OF CADMIUM IN PLANTS AFFECTED BY PHOSPHORUS

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Author:
No author available
Journal Title:
CHINESE JOURNAL OF APPLIED & ENVIRONMENTAL BIOLOGY
Issue:
2
DOI:
10.3321/j.issn:1006-687X.2000.02.005
Key Word:
磷-镉交互作用;镉的化学形态;生理特性;玉米;小麦;P-Cd interaction;chemical form of Cd;physiological characteristics;corn;wheat

Abstract: Corn and wheat cultivated in hydroponic culture solution with supplies of cadmium (c(Cd)0, 4.0 μmol/L) and phosphorus (c(P)0, 0.12, 0.6, 3.0 mmol/L) under controlled growth conditions in relation to the chemical forms of Cd, growth and physiological parameters, and enzyme activities of 21-day-old plants were investigated. The three predominant forms of Cd were NaCl-extractable Cd (related to Cd-binding proteins or polypeptides), acetic acid-extractable Cd (CdHPO4, Cd3(PO4)2, or Cd-polyphosphates), and water-extractable Cd (organic acid complexes). Increasing application of P tended to reduce the percentage of Cd combined with proteins and increase the amount of Cd-phosphates. Decreased cell plasma membrane permeability and K+ leakage of Cd-treated plants were observed with the P supply of 0.6 mmol/L. The moderate supply of P (0.6 mmol/L) also improved the contents of chlorophyll pigments, the activities of root dehydrogenase and leaf nitrate reductase in Cd-treated plants, whereas supply with an excess of P (3.0 mmol/L) showed not to be more effective in the alleviation of Cd toxic to plants. Results showed that wheat was more tolerant to Cd toxicity than corn. Fig 5, Tab 4, Ref17

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