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Characteristics and Performance of Interspecific Hybrids Between Kentucky Bluegrass and Canada Bluegras¹

Interspecific hybridization involving four Poa pratensis L. selections as female parents in crosses with P. compressa L. produced 2,104 hybrids. Crosses using the highly sexual Kentucky bluegrass cultivar, ‘Warren's A-20,’ and selections, Warren's A-25 and Warren's A-26, produced a very high frequency of hybrids.

Many of these hybrids showed considerable first year vigor with more abundant panicle production than generally found in Kentucky bluegrass. However, these particular plants produced a very few or no viable seeds. Cytological studies indicated that these mostly sterile hybrids originated from the fertilization of reduced female gametes by reduced male gametes.

The 54 interspecific hybrids produced using highly apomictic ‘Belturf’ Kentucky bluegrass as the female parent showed moderate to good floret fertility, acceptable seedling vigor, and some produced rather attractive turf. Cytological studies indicated that these fertile hybrids originated from the fertilization of unreduced eggs by reduced male gametes. These "triploid" F₁ hybrids are moderately to highly apomictic.

Key Words: Poa pratensis L. • Poa compressa L. • Apomixis • Triploid • Turfgrass breeding • Chromosome number

² Superintendent, River Vale Country Club, River Vale, NJ 07675, formerly research assistant, Soils and Crops Dept., Rutgers Univ.; associate professor, A. P. Agric. Univ., Hyderabad, India, formerly post-doctoral student, Rutgers Univ.; associate professor, Dept, of Horticulture and Forestry, Rutgers Univ.; and research professor, Soils and Crops Dept., Rutgers Univ.

Received for publication March 15, 1974.

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