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Simplot/Jacklin Seed, West 5300 Riverbend Ave., Post Falls, ID 83854-9499
* Corresponding author (dbrede{at}simplot.com)
‘Quantum Leap’ Kentucky bluegrass (Poa pratensis L.) (Reg. no. CV-67, PI 603096) is a turf-type cultivar released in August 1996, by Pickseed West, Tangent, OR, under a license agreement from the developer, the J.R. Simplot Co., Jacklin Seed, Post Falls, ID. Experimental designations for Quantum Leap were 91-1567 and J-1567.
Quantum Leap originated from a highly apomictic, single-plant selection from hybrid cross 89-1037, made in the field at Post Falls in July 1989 using pollen from ‘Midnight’ (Meyer et al., 1984) to pollinate plants of ‘Limousine’ (Alderson and Sharp, 1994). Seed harvested from Limousine mother plants were individually sown into cells of greenhouse flats during the spring of 1990 and later transplanted to a spaced-plant field nursery of 33500 plants. Offspring with characteristics dissimilar to Limousine were flagged during maturation in the spring of 1991. Plant number 91-1567 differed from Limousine for panicle shape and color. It produced 17.3 g of seed, which is typical for a Kentucky bluegrass spaced plant in North Idaho. Seed harvested from this plant was used to establish a turf trial in September 1991, a replicated seed yield trial in August 1992, and a U.S. Plant Variety Protection trial in June 1994, near Post Falls.
Quantum Leap is most similar to ‘Impact’ (PI 599225), which was developed from the same cross. It can be differentiated from Impact based on seven botanical traits, as recorded in the U.S. Plant Variety Protection application for Quantum Leap. These traits include shorter culm length, shorter panicle length, shorter flag leaf length, and later reproductive maturity in seed production.
Progeny trials, conducted in a 1994-1995 spaced-plant nursery, determined that the level of apomixis was sufficient for commercial seed production. The mean spaced-plant apomixis rate of Quantum Leap is 96%, but varies depending on weather and growing conditions. A survey of 1652 plants of Quantum Leap showed that 1.6% of plants were variants in the vegetative (preflowering) stage, 1.5% were heading maturity variants, 0.5% seedhead variants, 0.04% miniature plants, and 0.5% were headless plants. Some variants have a Limousine-like appearance, with tightly packed, light-green panicles. Other variants are shorter and later in maturity, with more purple color to the panicle. Aberrant progeny are rogued from seedstock fields to ensure continued uniformity and stability, but they will continue to occur in every generation. Quantum Leap is similar to Impact in apomixis.
Quantum Leap ranked 17th out of 103 entries for turf quality in the final summary of the 1995 National Turfgrass Evaluation Program (NTEP) trials for Kentucky bluegrass (Morris, 2001). Quantum Leap ranked among the top 20 entries for turf quality at locations in Iowa, Kentucky, Maryland, Missouri, Nebraska, New Jersey, Ohio, Oklahoma, Rhode Island, Utah, and Alberta and Quebec, Canada.
Quantum Leap ranked number 1 across two locations for resistance to melting out disease [caused by Drechslera poae (Baudys) Shoem] in the spring. It showed good resistance to iron chlorosis, leaf spot disease (caused by D. poae), necrotic ring spot (caused by Leptosphaeria korrae J. Walker and A.M. Smith), crown rust (caused by Puccinia coronata Corda.), and chinch bug (Blissus leucopterus hirtus Montandon). Quantum Leap had moderate resistance to drought (wilting and dormancy) in these tests. In 8 yr of commercial seed production, Quantum Leap has demonstrated the potential for high yields of quality seed, relative freedom from ergot [Claviceps purpurea (Fr.) Tul.], and no adverse reactions to labeled Kentucky bluegrass pesticides.
Quantum Leap is recommended for golf course tees, fairways, and roughs, and for lawns, parks, and sports turf, in full sun or some shade, in areas where Kentucky bluegrass is well adapted for turf. It is compatible in blends and mixtures with other cool-season turfgrasses at mowing heights as low as 13 mm.
Breeder seed, first harvested in 1995, is maintained by Simplot/Jacklin Seed. Seed propagation is limited to one generation of increase for Foundation, Registered, and Certified seed. U.S. Plant Variety Protection application no. 9700386 has been filed for Quantum Leap.
NOTES
Accepted for publication December 31, 2002.
REFERENCES
This article has been cited by other articles:
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  A. D. Brede Registration of 'Barrister' Kentucky Bluegrass Crop Sci., November 21, 2006; 46(6): 2718 - 2719. [Full Text] [PDF]
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