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. 1992 Oct;100(2):749–755. doi: 10.1104/pp.100.2.749

Alterations in Nicotiana tabacum L. cv Xanthi Cell Membrane Function following Treatment with an Ethylene Biosynthesis-Inducing Endoxylanase

Bryan A Bailey 1,2,1, Ronald F Korcak 1,2, James D Anderson 1,2,1
PMCID: PMC1075622  PMID: 16653055

Abstract

An ethylene biosynthesis-inducing xylanase (EIX) produced by the fungus Trichoderma viride elicited enhanced ethylene biosynthesis and leakage of potassium and other cellular components when applied to leaf disks of tobacco (Nicotiana tabacum L. cv Xanthi). Suspension-cultured cells of Xanthi tobacco responded to EIX by rapid efflux of potassium, uptake of calcium, alkalization of the medium, inhibition of ethylene biosynthesis, and increased leakage of cellular components. EIX-treated cell suspensions released 1-aminocyclopropane-1-carboxylate (ACC) into the surrounding medium, resulting in a reduction of cellular pools of ACC. The responses of both cell suspensions and leaf disks were inhibited (50-80%) by the preincubation of the tissues with the calcium channel blocker La3+. High concentrations of EGTA inhibited the alkalization of the medium by cell suspensions responding to EIX, but EGTA alone caused extensive loss of K+ and ACC and inhibited ethylene biosynthesis by tobacco cells. Alterations in membrane function appear to be important in the mode of action of EIX in Xanthi cells.

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Selected References

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