GENETIC ANALYSIS OF HEXAPLOID WHEAT, TRITICUM AESTIVUM, USING INTERVARIETAL CHROMOSOME SUBSTITUTION LINES. I. CULM LENGTH, EAR DENSITY, SPIKELET NUMBER AND FERTILITY

Genetic analyses were conducted of culm length, ear density, spikelet number and fertility in wheat using the two cultivars Chinese Spring and Hope and the 21 chromosome substitution lines of Hope in Chinese Spring.Elimination of differential vernalization and photoperiodic responses of the substitution lines revealed comparatively simple genetic control of these characters. Minimal estimates of the number of genes determining character expression are three for culm length, four for ear density, six for spikelet number and five for fertility. Major and minor influences of these genes have been arbitrarily determined.