Two Types of Channels Involved in the Malate Ion Transport across the Tonoplast of a Crassulacean Acid Metabolism Plant | Zendy

Ikuko Iwasaki | Zendy; Hiroyuki Arata | Zendy; Hiromasa Kijima | Zendy; Mitsuo Nishimura | Zendy

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Two Types of Channels Involved in the Malate Ion Transport across the Tonoplast of a Crassulacean Acid Metabolism Plant

Author(s) -

Ikuko Iwasaki,

Hiroyuki Arata,

Hiromasa Kijima,

Mitsuo Nishimura

Publication year - 1992

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.98.4.1494

Subject(s) - crassulacean acid metabolism , vacuole , biophysics , ion transporter , malic acid , biology , cytoplasm , biochemistry , flux (metallurgy) , efflux , metabolism , chemistry , microbiology and biotechnology , membrane , photosynthesis , citric acid , organic chemistry

Ion channels in tonoplast of leaf cells of a Crassulacean acid metabolism plant, Graptopetalum paraguayense, using the patch clamp technique were investigated. Results showed the existence of two types of channels involved in the malate ion transport across the tonoplast. One type corresponded to the slow-activating vacuolar-type (R Hedrich, E Neher [1987] Nature 329: 833-836), probably taking part in the malate efflux from vacuoles. Another showed the membrane potential-dependent channel current of malate flux over a wide range of cytoplasmic free Ca(2+) concentration (10(-8)-10(-5) molar), a property favoring the malate uptake. This type seems to be different from the fast-activating vacuolar-type.

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