Rl. Barbieri et al., GENETICS OF RESISTANCE TO THE FUNGUS HELMINTHOSPORIUM-SATIVUM IN WHEAT - USE OF CULTURE FILTRATES IN TISSUE-CULTURE, Brazilian journal of genetics, 20(3), 1997, pp. 477-482
Six wheat genotypes and their F-1 and F-2 generations were exposed to
the action of Helminthosporium sativum culture filtrates to examine th
e genetics of hexaploid wheat resistance. The objective was to improve
the efficiency of breeding programs by identifying the action and num
ber of genes involved in the resistance. The varied response of the te
sted genotypes to the culture filtrates allowed division of the genoty
pes into four groups: resistant, moderately resistant, moderately susc
eptible and susceptible. This variability was detected in the progeny,
suggesting that the parents have distinct genetic constitutions. Addi
tive gene action predominated and genetic gain was shown to be possibl
e through selection. The genetic control of the resistance trait seems
to be complex because of the presence of gene interaction and the dif
ficulty of eliminating the environmental effects. The inheritance seem
s to be oligogenic.