Changes of Onion Epidermal Cell Permeability Due to the Treatment with Alanap

Abstract

The effect of Alanap, N-1-naphthylphthalamic acid (NPA), on the permeability of onion {Alliuni cepa) epidermal cells was studied by means of a plasmometric method. Urea, 1,3-dimethylurea, and water were used for the test of permeability.It was found that the treatment of onion epidermis with NPA at various concentration (5x10--^ to 5 x 10-*^ M) altered the deplasmolysis rates and the absolute permeability constants. However, NPA did not alter the osmotic value of the treated cells. It was suggested that NPA treatment altered the permeability of onion epidermal cells due to the effect of this herbicide on the plasma membrane. K. A. FENG Physiol.Plant. 32.1974

Investigation of Effects of Plant Growth Regulators on Liposome Fluidity and Permeability

“…Thus, Hendricks and Borthwick (1967) stated that phytochrome acts on cell permeability as a first or early step in its control of plant growth and development. Changes in membrane permeability caused by gibberellin, kinetin, quartenary ammonium compounds and alanap also have been described (Wood et al 1974, Wood and Paieg 1972, Wain 1972, Feng 1973. Likewise, there is evidence that ethylene and 5 methyl-7-chloro-4-ethoxycarbonylmethoxy-2,1,3benzothiadiazole change the membrane permeability (Parups 1977).…”

“…Likewise, there is evidence that ethylene and 5 methyl-7-chloro-4-ethoxycarbonylmethoxy-2,1,3benzothiadiazole change the membrane permeability (Parups 1977). Model membrane systems and liposomes composed of phospholipids have been used to study phenomena related to permeability (Bangham et al 1965, 1973, Sessa and Weisman 1968, The lipids in model multi-bilayer systems undergo a temperature dependent transition from a "gel" phase to a lamellar smectic, liquid crystalline "fluid" phase in the presence of excess water. The transition temperatures are dependent on lipid composition (Chapman et al 1967(Chapman et al , 1974(Chapman et al , 1975 and are an indication ofthe "fluidity" of a membrane system.…”