  Using the theory of jet schemes, we give a new approach to the description of
a minimal generating sequence of a divisorial valuations on $\textbf{A}^2.$ For
this purpose, we show how one can recover the approximate roots of an
analytically irreducible plane curve from the equations of its jet schemes. As
an application, for a given divisorial valuation $v$ centered at the origin of
$\textbf{A}^2,$ we construct an algebraic embedding
$\textbf{A}^2\hookrightarrow \textbf{A}^N,N\geq 2$ such that $v$ is the trace
of a monomial valuation on $\textbf{A}^N.$ We explain how results in this
direction give a constructive approach to a conjecture of Teissier on
resolution of singularities by one toric morphism.
