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Journal of Experimental Botany, Vol. 52, No. 354, pp. 167-171, January 2001
© 2001 Oxford University Press

Short Communications

Partial mechanical impedance can increase the turgor of seedling pea roots

L. J. Clark1,2,4, W. R. Whalley2 and P. B. Barraclough3

1 Biochemistry and Physiology Department, IACR-Rothamsted, Harpenden, Hertfordshire AL5 2JQ, UK
2 Silsoe Research Institute, Wrest Park, Silsoe, Bedford MK45 4HS, UK
3 Crop and Weed Science Department, IACR-Rothamsted, Harpenden, Hertfordshire AL5 2JQ UK

Abstract

Roots of 3-d-old pea seedlings (Pisum sativum L.) were mechanically impeded using a sand core apparatus, which allowed mechanical impedance to be varied independently of aeration and water status. Turgor of root cortical cells was then measured using a pressure probe. In seedlings grown in sand cores for 1 d, impedance had little effect on turgor, but in seedlings grown in the sand cores for 2 d, impedance increased turgor by 0.18 MPa in the apical 6 mm.

Key words: Mechanical impedance, pea, Pisum sativum L., pressure probe, turgor.


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