01879naa a2200241 a 450000100080000000500110000800800410001910000180006024500840007826000090016252011550017165000130132665000150133965000090135465000220136365300100138565300110139565300180140665300220142465300830144670000170152977300910154614686432011-12-02       2005    bl uuuu     u00u1 u    #d1 aBASSOI, M. C.  aRelationship between grain colour and preharvest sprouting-resistance in wheat.  c2005  aSince red alleles (R) of the genes that control grain colour are important for the improvement of preharvest sprouting resistance in wheat and there are three independently inherited loci, on chromosomes 3A, 3B and 3D of hexaploid wheat, it is possible to vary the dosage of dominant alleles in a breeding program. The objective of this work was to evaluate the dosage effect of R genes on preharvest sprouting, in a single seed descent population, named TRL, derived from the cross between Timgalen, white-grained wheat, and RL 4137, red-grained wheat. The study was carried out using sprouting data in ripe ears obtained under artificial conditions in a rainfall simulator over three years. According to the results there is a significant effect on preharvest sprouting provided by colour and a weaker effect of increasing R dosage. However, the significant residual genotypic variation between red lines and all lines (reds and whites) at 0.1% level showed that preharvest sprouting was also controlled by other genes. There are no significant correlations between sprouting and date of ripeness or between ripeness, R dosage and colour intensity.  adormancy  aDormência  aGene  aTriticum Aestivum  aalelo  aallele  adosage effect  aefeito de dosagem  aRelationship between grain colour and preharvest sprouting-resistance in wheat1 aFLINTHAM, J.  tPesquisa Agropecuária Brasileira, Brasília, DFgv. 40, n. 10, p. 981-988, out. 2005.