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Journal of Experimental Botany, Vol. 52, No. 358, pp. 1129-1133, May 1, 2001
© 2001 Oxford University Press

Short Communication

Water stress can induce quiescence in newly-germinated onion (Allium cepa L.) seedlings

W.R. Whalley1,4, J. Lipiec2, W.E. Finch-Savage3, R.E. Cope1, L.J. Clark1 and H.R. Rowse3

1 Silsoe Research Institute, Wrest Park, Silsoe, Bedford MK45 4HS, UK
2 Polish Academy of Sciences, Institute of Agrophysics, 20-290 Lublin 27, Poland
3 Horticulture Research International, Wellesbourne, Warwick CV35 9EF, UK

Abstract

The effect of water stress on the early seedling growth of onions was studied by placing newly-germinated seedlings in vermiculite equilibrated at different water potentials. Roots and shoots elongated more at -0.29 than at -0.64 MPa, but did not elongate at -1.66 MPa. However, roots and shoots of seedlings that had been incubated in vermiculite at -1.66 MPa for up to 35 d resumed elongation when subsequently placed on wet filter boards. This suggests that water stress can induce quiescence in newly-germinated seedlings.

Key words: Allium cepa L., growth curves, onion, recovery, water stress.


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