Recovery of cowpea seedling roots from exposure to toxic concentrations of trace metals

Blamey, F. P. C., Kopittke, P. M., Wehr, J. B. and Menzies, N. W. (2011) Recovery of cowpea seedling roots from exposure to toxic concentrations of trace metals. Plant and Soil, 341 1-2: 423-436. doi:10.1007/s11104-010-0655-0

Author Blamey, F. P. C.
Kopittke, P. M.
Wehr, J. B.
Menzies, N. W.
Title Recovery of cowpea seedling roots from exposure to toxic concentrations of trace metals
Journal name Plant and Soil   Check publisher's open access policy
ISSN 0032-079X
Publication date 2011-04
Year available 2010
Sub-type Article (original research)
DOI 10.1007/s11104-010-0655-0
Volume 341
Issue 1-2
Start page 423
End page 436
Total pages 14
Place of publication Dordrecht, Netherlands
Publisher Springer Netherlands
Collection year 2012
Language eng
Formatted abstract
Rhizotoxic effects of many trace metals are known, but there is little information on recovery after exposure. Roots of 3-d-old cowpea (Vigna unguiculata (L.) Walp. cv. Caloona) seedlings were grown for 4 or 12 h in solutions of 960 μM Ca and 5 μM B at two concentrations (which reduce growth by 50 or 85%) of nine trace metals that rupture the outer layers of roots. Measured concentrations were 34 or 160 μM Al, 0.6 or 1.6 μM Cu, 2.2 or 8.5 μM  Ga, 2.3 or 12 μM Gd, 0.8 or 1.9 μM Hg, 1.0 or 26 μM In, 2.4 or 7.3 μM La, 1.8 or 3.8 μM Ru, and 1.3 or 8.6 μM Sc. Roots were rinsed, transferred to solutions free of trace metals, and regrowth monitored for up to 48 h. Recovery from exposure to Hg occurred within 4 h, but regrowth was delayed for ≥ 12 h with Al, Ga, or Ru. There was poor regrowth after 4 or 12 h exposure to Cu, Gd, In, La, or Sc. Roots recovered after being grown for 12 to 48 h in 170 μM Al, 5.1 μM  Ga, 2.0 μM Hg, or 1.4 μM Ru, but the extent of recovery was reduced with longer exposure time. Microscopy showed marked differences in symptoms on roots recovering from exposure to the various trace metals. Differences in (i) concentrations that are toxic, (ii) ability of roots to recover, (iii) time for recovery to occur, and (iv) symptoms that develop, suggest that each trace metal has a unique combination of rhizotoxic effects.
Keyword Cowpea
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 23 December 2010

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Agriculture and Food Sciences
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