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J.R. Simplot Co., W. 5300 Riverbend Ave., Post Falls, ID 83854
* Corresponding author (ssamudio{at}simplot.com)
‘J-36’ Japanese zoysiagrass (Zoysia japonica Wild.) (Reg. no. CV-219, PI 573033), is a seed-propagated, turf-type cultivar developed and released by J.R. Simplot Co., Jacklin Seed Division, Post Falls, ID, in September 1996. First Certified seed was produced in July 1996.
J-36 originated from four Simplot breeding lines: ZJ-11 (early generation material from the USDA obtained by Jacklin Seed through a cooperative research agreement on 30 Oct. 1988), JZ-1 (Japanese germplasm received November 1987), ZJ-46 (Korean germplasm received July 1988), and ZJ-9 (Chinese germplasm received May 1988 from Qin Huang Dao, China).
In 1989, seed of each breeding line was planted in a greenhouse at Post Falls and transferred to separate isolated blocks at Visalia, CA. Less than 10% of the plants were removed on the basis of turf quality. In May 1991, clones with an abundance of predominately yellow heads, dark leaf color, and fine texture were selected. The selected clones were vegetatively sampled, bulked, and randomly sprigged into a 0.1-ha breeder block near Lakeland, GA, in May 1991. In 1992, the field was rogued to increase uniformity; approximately 20% of the plants were removed based on less desirable phenotypes which included wider leaves, lighter color, and lower plant density. In 1994, after harvesting the seed crop, the block was vegetatively increased to about 3.25 ha.
J-36 is a uniform, seed-propagated cultivar that has medium-dark-green color, medium density, medium-broad texture, and is moderately rhizomatous under turf conditions. Approximately 10% of the plants in the cultivar have purple pigmentation (visible on seedheads and stolons) while the rest of the plants have yellowish coloration.
J-36 was entered in the 1996 zoysiagrass National Turfgrass Evaluation Program Trials (Morris, 1998, 1999, 2000). J-36 demonstrated improvements in seedling vigor; establishment; turf quality; spring greenup; fall density; living ground cover in spring, summer, and fall; drought tolerance; frost tolerance; winter color; dollar spot (caused by Lanzia and Moellerodiscus spp.) resistance; and zoysia mite (Eriophyes zoysiae Baker, Kono, and O'Neil) resistance when compared with other seeded zoysiagrass cultivars and experimental strains. J-36 also demonstrated superior establishment and turf quality through the first 1.5 yr of the trial compared with ‘Meyer’ (Hanson, 1966), the standard for vegetatively propagated zoysiagrass cultivars in the industry.
J-36 should perform well when used for lawns, parks, roadsides, cemeteries, and golf course roughs and fairways, but not putting greens.
Breeder seed of J-36 is maintained by Simplot, Post Falls, ID. Seed production is limited to three cycles of increase after Breeder seed: Foundation, Registered, and Certified. U.S. Plant Variety Protection certificate no. 9300288 was granted 10 May 2001 for J-36.
NOTES
Accepted for publication September 30, 2001.
REFERENCES
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