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Plant and Cell Physiology, 1984, Vol. 25, No. 5 683-690
© 1984

Article

Stomatal Opening and Cell Enlargement in Response to Light and Phytohormone Treatments in Primary Leaves of Red-Light-Grown Seedlings of Phaseolus vulgaris L.

Horst Göring, Svetlana Koshuchowa, Heinz Münnich and Manfred Dietrich

Humboldt University, Section of Biology, Department of Plant Physiology Invalidenstrasse 42, 1040 Berlin, G.D.R.

Cell enlargement in primary leaves of bean seedlings grown for 10 days in dim red light in response to different light and phytohormone treatments was studied. On day 10, bean leaf discs were floated on 1% sucrose with, or without, phytohormones for different periods (up to 24 h) under dim red light, or discs were floated in sucrose solution and irradiated with white or blue light. Cell enlargement was enhanced by continuous white and blue light and by benzyladenine, kinetin and gibberellic acid.

When seedlings were grown for 8 days under dim red light after which a 2-day dark period was interposed (for the accumulation of inactive phytochrome), cell enlargement was enhanced by a 5-min irradiation with red light. This growth induction was far-red reversible.

The conditions under which cell enlargement was promoted, also induced the opening of the stomata. Red light induced a far-red reversible transient stomatal opening. Based on the kinetics of stomatal opening and cell enlargement we formulated the hypothesis that cell enlargement in leaves in response to light and phytohormones is mediated by the stomatal response to these factors.

(Received September 30, 1983; Accepted February 27, 1984)
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