Randomness of Mating in a Polycross of Orchardgrass, Dactylis glomerata L.1

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Abstract
Randomness of mating was studied by using a genetic marker. The polycross contained 10 plants from each of five selections including four recessive alboviridis clones and one normal green clone homozygous dominant at the marker locus. Three‐year average percentages of crossing with the normal clone ranged from 30 to 39 among the four alboviridis clones. There was considerable yearly variation in the average percentage for each clone. Data on panicle number and seed yield indicated that the normal clone porduced the most pollen, which may account for average percentages greater than the 25% expected on the basis of random mating and no selling. Amount of crossing with the normal clone was not affected consistently by degree of self‐fertility of the maternal parent except in a year of sparse heading when average percentages of normal seedlings in progenies of two relatively self‐fertile clones were lower than those for two relatively self‐sterile clones. Percentages of normal seedlings in progenies of individual albovirldis plants ranged from 2 to 72, and in 2 of 3 years the percentages were associated with wind conditions and distance downwind from a normal plant.

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