Bibliography: leaves 94-108. / xi, 108, [88] leaves, [28] leaves of plates : ill. (some col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / The aim of this study is to characterize plastid DNA sequence homologies within higher plant nuclear genomes. It is concluded that integrated within the tobacco nuclear genome are multiple copies of large (ie. in excess of 18 kbp), contigous fracts of plastid DNA. The presence of large tracts of plastid DNA in the tobacco nuclear genome contrasts the arrangement of such sequences in the nuclear genomes of other studied plant species. / Thesis (Ph.D.)--University of Adelaide, Dept. of Genetics, 1993