Relative toxicity of arsenite and arsenate on germination and early seedling growth of rice (Oryza sativa L.)

M J Abedin, A A Meharg

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149 Citations (Scopus)

Abstract

Elevated soil arsenic levels resulting from long-term use of arsenic contaminated ground for irrigation in Bangladesh may inhibit seed germination and seedling establishment of rice, the country's main food crop. A germination study on rice seeds and a short-term toxicity experiment with different concentrations of arsenite and arsenate on rice seedlings were conducted. Percent germination over control decreased significantly with increasing concentrations of arsenite and arsenate. Arsenite was found to be more toxic than arsenate for rice seed germination. There were varietal differences among the test varieties in response to arsenite and arsenate exposure. The performance of the dry season variety Purbachi was the best among the varieties. Germination of Purbachi was not inhibited at all up to 4 mg l(-1) arsenite and 8 mg l(-1) arsenate treatment. Root tolerance index (RTI) and relative shoot height (RSH) for rice seedlings decreased with increasing concentrations of arsenite and arsenate. Reduction of RTI caused by arsenate was higher than that of arsenite. In general, dry season varieties have more tolerance to arsenite or arsenate than the wet season varieties.

Original languageEnglish
Pages (from-to)57-66
Number of pages10
JournalCommunications in Soil Science and Plant Analysis
Volume243
Publication statusPublished - 2002

Keywords

  • arsenate
  • arsenite
  • germination
  • rice
  • seedling
  • toxicity
  • HOLCUS-LANATUS L
  • SILENE-VULGARIS
  • FLOODED CONDITIONS
  • CHEMICAL FORM
  • SOIL SOLUTION
  • TOLERANCE
  • METAL
  • PHYTOCHELATINS
  • ACCUMULATION
  • CONTAMINATION

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