01576nam a2200337 a 450000100080000000500110000800800410001910000190006024500440007926000460012330000100016950000490017952006960022865000130092465000200093765000240095765000120098165000140099365000130100765000250102065000210104565000250106665000080109165300260109965300260112565300210115165300180117265300180119065300120120865300180122011799562023-12-21       2001    bl uuuu  m   00u1 u    #d1 aDUSI, D. M. A.  aApomixis in brachiaria decumbens stapf.  aWageningen: Wageningen Universiteitc2001  a167p.  aTese Doutorado. Orientador: M.T.M. Willemse.  aIn this thesis a comparison of gametophyte development between a sexual diploid and an apomictic tetraploid genotype of Brachiaria decumbens was made. Apomixis is asexual reproduction leading to a seed. An introduction is given on apomixis in general and in particular of Brachiaria. The work started with morphological and cytological observations of sporophyte and gametophyte development to detect the moments in which the sexual and apomictic development differ and therefore some points of regulation could be identified. Metabolic and molecular studies were added to detect the differences in the sexual and apomictic plants, to analyse the regulation of the two types of reproduction.  aapomixis  agene expression  asexual reproduction  asucrose  asynthesis  aApomixia  aBrachiaria Decumbens  aCapim Brachiaria  aReprodução Sexuada  aRNA  aEmbriogenese somatica  aEmbryonic development  aExpressao genica  aPartenogenese  aParthenogesis  aSintese  aSurinam grass