Germination of Medicago sativa is inhibited by soluble compounds in cement dust
2014
Lafragüeta, Cristina | García Criado, Balbino | Arranz, Ángel | Vázquez de Aldana, Beatriz R. | European Commission | Junta de Castilla y León | Vázquez de Aldana, Beatriz R. [0000-0001-6549-3545]
18 páginas, 3 tablas, 4 figuras.
Show more [+] Less [-]Deposition of cement dust on soils and plant surfaces is known to affect plant growth and the species composition of plant communities, but little is known about its effects (and those of its pH and constituents) on germination. Therefore, the aim of this study was to assess the toxicity of an aqueous cement extract, constituents of the extract and pH on the germination of seeds of a selected species, Medicago sativa. First, the effects of the extract were tested in assays with concentrations and exposure durations ranging from 0 to 1.0 g/mL and 4 to 96 h, respectively. At 0.8 g/mL, the extract strongly inhibited germination; a 4-h exposure reduced the germination rate, from 77 ± 1.8 to 50 ± 2.6% (mean ± SE), while 8-h exposure completely inhibited it. Further, treatment at this concentration killed the non-germinating seeds, thus the inhibition was due to toxic effects. Neither the pH of the extract nor the concentration of its main soluble elements separately (K, Ca, S, Na, or Cr) caused the toxicity since germination rates were not significantly reduced when these variables were tested individually. However, a mixture of the elements in solution reduced germination rates, suggesting that they have adverse synergistic effects.
Show more [+] Less [-]This work was supported by a research contract with Grupo Inzamac, San Gregorio (Construcciones) and Collosa companies through a project supported by ADE (Agencia de Desarrollo Económico of the regional Junta de Castilla y León) and FEDER (Fondo Europeo de Desarrollo Regional). Cristina Lafragüeta’s contribution was funded by this contract.
Show more [+] Less [-]Peer reviewed
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