Abstract
Five cultivars of spring oats (Avena sativa L.), ranging in maturity from early to late, were planted on several dates in 1972 and 1973. Plant samples were collected from each cultivar starting at the four‐leaf stage and continuing at 3‐day intervals until anthesis was observed in apical florets. These samples were dissected to expose the reproductive axis in order to follow its seasonal development and to differentiate floral development patterns that influence panicle expansion in different cultivars to determine the effect of planting date on floral development and to compare floral development in the first and second tillers of the plant.Cultivar maturation was influenced by the length of time of the vegetative stage, the length of the reproductive phase as affected by rate and amount of primordia addition, and rate and amount of panicle elongation.Later planting dates hastened sexual maturity of all cultivars by shortening the vegetative stage, hastening primordium addition, and decreasing total panicle length. Panicle development in the second tiller paralleled that of the first tiller, hut was delayed 2 to 4 days.
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