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Role of ethylene and auxin in regenerative differentiation and orientation of tracheids in Pinus pinea seedlings

Published online by Cambridge University Press:  01 May 1999

NATALIE KALEV  and
RONI ALONI
NATALIE KALEV
Affiliation:
Department of Plant Sciences, Tel Aviv University, Tel Aviv 69978, Israel
RONI ALONI
Affiliation:
Department of Plant Sciences, Tel Aviv University, Tel Aviv 69978, Israel
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Abstract

A low auxin concentration (0.1% naphthalene acetic acid) induced tracheids with longitudinal polarity parallel to the hypocotyl axis in young Pinus pinea seedlings. Application of 0.1% ethrel laterally and 0.1% naphthalene acetic acid apically disturbed axial tracheid polarity and promoted the differentiation of tracheids with a lateral orientation. Ethrel by itself, with no auxin background, did not affect tracheid differentiation. Apical application of 1% gibberellic acid with the low auxin, reversed the polarity disorder induced by ethrel. Disturbance of axial tracheid polarity was observed under a high auxin concentration (0.5% naphthalene acetic acid) which was similar to the combined effect of ethrel and auxin. The high auxin concentration increased tracheid number significantly. This effect was curtailed following treatment with inhibitors of ethylene formation (Co2+; 1-aminoethoxy- vinylglycine) and action (Ag2+). The role of ethylene in controlling the differentiation of radial tracheids, which characterize the vascular rays of pines, is discussed.

Keywords

phytohormones (ethylene, auxin)Pinus pinea (pine)tracheid differentiationxylem (differentiation, regeneration)
Type
Research Article
Information
The New Phytologist , Volume 142 , Issue 2 , May 1999 , pp. 307 - 313
Copyright
© Trustees of the New Phytologist 1999

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