bquote() in direct use for plot() or for a do.call(plot, ) use

The behavior of bquote() is different if it is used directly in a function or stored in a list to be used with de do.call():
Let try:

> plot(1, 1, ylab=bquote(expr = "1000"^"-1"))
> L <- list(x=1, y=1, ylab=bquote(expr = "1000"^"-1"))
> do.call(plot, L)
Error in "1000"^"-1" : argument non numérique pour un opérateur binaire

The correct solution is to convert the bquote() as an expression:

> plot(1, 1, ylab=as.expression(bquote(expr = "1000"^"-1")))
> L <- list(x=1, y=1, ylab=as.expression(bquote(expr = "1000"^"-1")))
> do.call(plot, L)

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