On leave from the Biology Faculty of the Univ. of Barcelona, and supported by a grant from Dept. Agr., Ramaderia i Pesca de la Generalitat de Catalunya, Barcelona, Spain.
Research Associate (IWONL), Dept. of Biology, Univ. of Antwerp, B-2610-Wilrÿk, Belgium.
Research Scientist, Institute of Ornamental Plant Growing, Chemistry Dept.
Professor, Dept. of Biology, Univ. of Antwerp, B-2610-Wilrÿk, Belgium.
Received for publication 30 Jan. 1985. The authors acknowledge H. Engels, F. Kockelbergh, E. Vandervennet, and W. Van Keirsbulck for excellent technical assistance as well as ir. O. Mekers for growth chamber facilities. We also thank J.F. Aguilá (Barcelona, Spain) for initiating the problem. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.
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