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Marker genes have played a critical role in the discovery of plant transposable elements, our understanding of transposon biology, and the utility of transposable elements as tools in functional genomics. Marker traits in model plants have been useful to detect transposable elements and to study the dynamics of transposition. Transposon-induced changes in the sequence of marker genes and consequently their expression have contributed to our understanding of molecular mechanisms of transposition and associated genome rearrangements. Further, marker genes that have been cloned and are compatible in heterologous systems have found versatile utility in the design of
DNA
constructs that have enabled us to understand the finer details of transposition mechanisms, and also allowed the use of transposon-based tools for functional genomics. This chapter traces the role of marker traits and marker genes (endogenous and transgenic) in various plant systems, and their contributions to the advancement of transposon biology over the past several decades.