Missing abstract in scrreprt

I have just started writing my thesis, and I noticed that the title for the abstract is not spelled out. Well, as it seems, the abstract has to be explicitly switched on with scrreprt class using the abstracton option.

\documentclass[a4paper,10pt, abstracton]{scrreprt}

how to use landscape document mode

 \usepackage[landscape]{geometry}

\documentclass[landscape,twocolumn,letterpaper]{article}

 some more hints at

http://texblog.org/2007/11/10/landscape-in-latex/ 

How to use subtitle in an article

Make use of the \subtitle command, to do this use scrartcl document class,

and if you want the same fonts as at the article class,

also set them accordingly with \setkomafont

\documentclass{scrartcl}

\setkomafont{disposition}{\normalfont\bfseries}

\begin{document}

\title{(Title)}
\subtitle{(Subtitle)}
\author{(Author)}
\maketitle
\end{document}