Role of the Plasmalemma in Controlling the Gravitropic Response of Wheat Coleoptiles

Role of the Plasmalemma in Controlling the Gravitropic Response of Wheat Coleoptiles The changes in the specific binding of 3H-IAA to the plasmalemma from segments of wheat (Triticum aestivumL.) coleoptiles and the physiological activity of the IAA–protein complexes thus formed in dependence on the duration of gravitational stimulation (GS) (1 g) were studied. The overall inhibition of the formation of IAA–protein complexes was accompanied by a transverse polarization of their functional activity occurring as early as within two minutes after the onset of GS. The pretreatment of plasmalemmal vesicles with 0.1 μM CaCl2prevented the in vitroIAA–protein complex formation in the plasmalemma. It is suggested that the GS results in an increase in the plasmalemma permeability for Ca2+, which reduces the capacity of the plasmalemma to bind IAA at the early stages of the gravitropic response. Russian Journal of Plant Physiology Springer Journals

Role of the Plasmalemma in Controlling the Gravitropic Response of Wheat Coleoptiles

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Kluwer Academic Publishers-Plenum Publishers
Copyright © 2001 by MAIK “Nauka/Interperiodica”
Life Sciences; Plant Sciences
Publisher site
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