Rl. Villareal et al., INHERITANCE OF THRESHABILITY IN SYNTHETIC HEXAPLOID (TRITICUM-TURGIDUM X TRITICUM-TAUSCHII) BY TRITICUM-AESTIVUM CROSSES, Plant breeding, 115(5), 1996, pp. 407-409
Triticum tauschii provides breeders with a valuable source of resistan
ce and tolerance genes. Elucidation of the inheritance of traits in th
is species that hinder its use in breeding programmes is therefore of
interest to wheat breeders. Inheritance of threshability was investiga
ted in the crosses of four non-free-threshing (NFT) synthetic hexaploi
ds (Triticum turgidum x T. tauschii) and two free-threshing(FT) T. aes
tivum cultivars during four crop seasons over 3 years at El Batan and
Ciudad Obregon, Mexico. The parents, their F-1 hybrids and individual
F-2 plant-derived F-3 progenies of the crosses revealed that 'Altar 84
'/T. tauschii (219), 'Chen'/T. tauschii (205), 'Chen'/T. tauschii (224
), and 'Duergand'/T. tauschii (214) have independently segregating loc
i with two dominant alleles controlling threshability. Intercrosses am
ong the synthetics, except 'Altar 84'/T. tauschii(219), showed the gen
es to be allelic to each other. The cross between the FT cultivars sho
wed no segregation in the F-3 generation, indicating common recessive
genes. Based on these findings, population sizes of the synthetic-deri
ved breeding materials should be increased to improve the chances of s
electing FT desirable plants in the programme.