Higher eukaryotes are characterized by the allocation of distinct
functions to numerous types of differentiated cells. Whereas in
animals the well-defined, protected cells of the germ line separate
early, germ cells in plants differentiate from somatic cells only
after many cycles of mitotic division. Therefore somatic mutations
in plants can be transmitted via the germ cells to the progeny.
There is thus a clear need for somatic tissues to maintain their
genetic integrity in the face of environmental challenges, and two
types of interactions have been shown to play important roles in
the conservation as well as flexibility of plant genomes:
homologous recombination of repeated sequences and silencing of
multiplied genes. Sensitive methods have been developed that allow
greater insights into the dynamics of the genome. This book
summarizes current knowledge and working hypotheses about the
frequencies and mechanisms of mitochondrial, plastid, nuclear and
viral recombination and the inactivation of repeated genes in
plants. Despite rapid developments in the field, it is often not
possible to provide final answers. Thus, it is an additional task
of this book to define the open questions and future challenges.
The book is addressed to scientists working on plant biology and
recombination, to newcomers in the field and to advanced biology
students.
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