O gene Pi-ar confere resistência à brusone no somaclone derivado de panÃculas imaturas
da cultivar de arroz de terras altas “Araguaia†e o marcador RAPD OPK17680 mostra-se
ligado ao gene Pi-ar. O objetivo desse trabalho foi verificar a eficiência do marcador
OPK17 para a seleção do gene Pi-ar em uma população F1RC3 obtida de cruzamento
entre a cultivar suscetÃvel de arroz de terras altas “IAC 201†e o somaclone resistente
SC09. As plantas dessa população foram inicialmente avaliadas para a raça IB-9 de
Pyricularia grisea em casa de vegetação e, posteriormente, o DNA dessas plantas foi
amplificado com o marcador. A eficiência obtida pela seleção assistida de plantas
resistentes e suscetÃveis pelo marcador OPK17 foi de 62,3%.
The gene Pi-ar confers resistance to rice blast in a somaclone derived from immature
panicles of the upland rice cultivar “Araguaia†and the RAPD OPK17680 marker has
been shown to be linked to this gene. The objective of the present investigation was
to determine the efficiency of the marker OPK17 for the selection of the gene Pi-ar in
a back cross population. The backcross population F1BC3 was obtained from a cross
between a susceptible upland rice cultivar “IAC 201†and the resistant somaclone
SC09. The plant population was initially screened for blast resistance against the race
IB-9 of Pyricularia grisea in the greenhouse and later the DNA of these plants was
amplified with the marker OPK17. The efficiency of marker assisted selection in resistant
and susceptible plants with marker OPK17 was 62.3%.
