Rl. Villareal et al., ASSOCIATED EFFECTS OF CHROMOSOME 1B 1R TRANSLOCATION ON AGRONOMIC TRAITS IN HEXAPLOID WHEAT/, Ikushugaku Zasshi, 44(1), 1994, pp. 7-11
Two trials were conducted to determine the effect of 1B/1R chromosome
translocation on selected agronomic characteristics of spring bread wh
eats (Triticum aestivum L.) developed at the International Maize and W
heat Improvement Center (CIMMYT). Five bread wheat genotypes with a ch
romosome 1B/1R translocation and five without representing a sample of
high yielding germplasm were identified for the experiment. Non-limit
ing levels of fertility and moisture with a preventive pest and diseas
e program were used. Plant height, days to heading, grain yield, above
-ground biomass at maturity, harvest index, yield components and test
weights were determined. Genotypes with the 1B/1R chromosome transloca
tion had 2.2% higher above-ground biomass yield, 2.1% more spikes m-2,
1.12 g higher 1,000-grain weight and 0.8 kg/ha-1 higher test weight.
The non-1B/1R genotypes had 0.8% higher harvest index and 0.6 cm longe
r spikes. Cultivar comparisons indicated that the 1B/1R group headed 2
.5 days later than the 1B group.