\newcommand{\rep}[1]{#1 #1 #1 #1}
\newcommand{\scenephase}[2]{%
\pstree[treemode=R]{\Tr{\psframebox{\vbox to6cm{\vspace{\fill}\hbox{\rotatebox{270}{#1}}\vspace{\fill}}}}}{#2}}
\newcommand{\jbphase}[2]{%
\pstree[treemode=L]{#2}{\rep{\Tr{\psframebox{\vbox to1cm{\vspace{\fill}\hbox{#1}\vspace{\fill}}}}}}}
\newcommand{\bodyphase}[2]{%
\pstree[treemode=R]{\Tr{\psframebox{\vbox to1cm{\vspace{\fill}\hbox{#1}\vspace{\fill}}}}}{#2}}

\begin{slide}{Soot phases}
\begin{center}
\psset{levelsep=*.3,treesep=.4}
\jbphase{jb}{\scenephase{cg}{\scenephase{wjtp}{\scenephase{wjop}{\scenephase{wjap}{%
\rep{\bodyphase{jtp}{\bodyphase{jop}{\bodyphase{jap}{\bodyphase{bb}{\bodyphase{tag}{}}}}}}}}}}}
\end{center}
\end{slide}