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Published online 21 November 2006
Published in Crop Sci 46:2721-2722 (2006)
© 2006 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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REGISTRATIONS OF CULTIVARS

Registration of ‘Tamrun OL07’ Peanut

M.R. Baringa,*, C.E. Simpsonb, M.D. Burowc, M.C. Blackd, J.M. Casonb, J. Ayerse, Y. Lopeze and H.A. Meloukf

a Soil and Crop Sci. Dep., Texas Agric. Exp. Stn., Texas A&M Univ., College Station, TX 77843
b Texas Agric. Exp. Stn., Stephenville, TX 76401
c Texas Agric. Exp. Stn., Lubbock, TX 79403
d Texas Coop. Ext., Texas Agric. Res. & Ext. Ctr., Uvalde, TX 78802
e Texas Agric. Exp. Stn., Lubbock, TX 79403
f USDA-ARS, Oklahoma State Univ., Stillwater, OK 74078

* Corresponding author (m-baring{at}tamu.edu)

‘Tamrun OL07’ (Reg. no. CV-92, PI-642851) is a runner market-type peanut (Arachis hypogaea L. subsp. hypogaea var. hypogaea) cultivar with a high O/L ratio and good yield potential. The new variety was tested as Tx033630 and was released by the Texas Agricultural Experiment Station in May 2006.

Tamrun OL07 was derived from a three-way cross among ‘Tamrun 96’ (Smith et al., 1998), breeding line Tx901639-3, and ‘SunOleic 95R’ (Gorbet et al., 1997), the donor of the high O/L genes (O = oleic fatty acid; L = linoleic fatty acid). The first cross was made in 1995 between Tx901639-3 and SunOleic 95R. The resulting F1 progeny were grown in a nursery in Bryan, TX, the following summer. The F2 progeny were grown in the 1996–1997 winter greenhouse and pollen from those F2 progeny were used to pollinate Tamrun 96 in the spring of 1997. Resulting F1 progeny were increased during the summer and individual plant selections (IPS) were made the following year in the 1998 F2 generation. F2:3 generation plant rows were tested for Tomato spotted wilt virus (TSWV) resistance during the 1999 growing season. In 2000, the resulting selections were space planted as F2:4 generation plants in a Sclerotinia blight nursery and reselected as IPS for disease resistance and uniformity of agronomic characteristics. F4:5 individual plant selections were planted in the greenhouse during the winter of 2000–2001 as a quarantine measure because Sclerotinia blight (caused by Sclerotinia minor Jaggar) can be seed transmitted and subsequent testing on Sclerotinia-free fields was to follow. The F4:6 plant rows were grown in the 2001 TSWV nursery where final selections were made on the basis of TSWV disease ratings.

The final selection was yield tested as breeding line Tx033630. Initial yield testing for Tamrun OL07 began as an F4:7 generation bulk in 2002 and was conducted until 2005 resulting in a F4:10 generation line for release.

Tamrun OL07 has a larger vine than that of ‘Tamrun OL 01’ (Simpson et al., 2003). The mainstem height is, on average, 13.9 cm taller than Tamrun OL 01 (p ≤ 0.01), and the N +1 lateral branches are 15.3 cm longer (p ≤ 0.01). The mainstem is apparent at most locations and seeding rates tested. Branching is profuse like Tamrun OL 01 and the branching pattern is alternate, although not perfectly 2 + 2. Leaf color is medium green, as with Tamrun OL 01 (RHS 137A).

Pods of Tamrun OL07 are mostly two seeded and shorter than those of Tamrun OL 01 resulting in significantly smaller seed size, averaging 68.1 vs. 72.3 g 100 seed–1 (p ≤ 0.05), across all locations. Pod constriction between the seeds is moderate and no differences were detected between the two cultivars in analysis of pod measurements.

Disease ratings indicate that Tamrun OL07 has more resistance to TSWV than Tamrun OL 01, ‘Tamrun OL 02’ (Simpson et al., 2006), and Flavor Runner 458. Yield test in a South Texas TSWV nursery showed Tamrun OL07 had fewer diseased plants with a visual rating of 28.3% as compared with Tamrun OL 01, Tamrun OL 02, and Flavor Runner 458 with ratings of 58.8, 55.0, and 74.1%, respectively (p ≤ 0.01).

The increased disease resistance for Tamrun OL07 was reflected in higher yields under heavy TSWV pressure. Data analyzed from 2004 and 2005 detected a difference between Tamrun OL07 and the check cultivars. Tamrun OL07 yielded 5447 kg ha–1 as compared with 4160 kg ha–1 for Tamrun OL 01, 3508 kg ha–1 for Tamrun OL 02, and 2313 kg ha–1 for Flavor Runner 458. Grades were not significantly different (p ≤ 0.01).

Disease ratings for Tamrun OL07 in the Central Texas Sclerotinia blight nursery indicate that Tamrun OL07 has more resistance than the check cultivars. Analysis of test ratings from 2002 through 2005 show that Tamrun OL07 has an average Sclerotinia infection rating of 34.1% compared with Tamrun OL 01 with 46.0%, Tamrun OL 02 with 50.1%, and Flavor Runner 458 with 60.7% (p ≤ 0.01). Yield data was reflective of the disease ratings and indicated that Tamrun OL07 performed equal to Tamrun OL 01 and better than Tamrun OL 02, and Flavor Runner 458 (p ≤ 0.05). The average yields from 2002 through 2005 for Tamrun OL07, Tamrun OL 01, Tamrun OL 02, and Flavor Runner 458 were 2691, 2207, 1156, and 1915 kg ha–1, respectively. Grades were again not different (p ≤ 0.05). From 2002 through 2005 across disease-free locations, no yield difference was detected between Tamrun OL07 and any of the check cultivars (p ≥ 0.05).

Foundation seed of Tamrun OL07 will be maintained and distributed by the Foundation Seed Service of the Texas Agricultural Experiment Station, Vernon, TX 76384. Contact the Texas Foundation Seed Service for all seed request. No seed will be distributed without written permission for 20 yr from the (date of publication in Crop Science) by the Texas Agricultural Experiment Station, Texas A&M University System, at which time seed will also be available from the National Plant Germplasm System (NPGS). Plant Variety Protection for the cultivar is being applied for, and the cultivar may only be sold and grown as a class of certified seed by name only.

ACKNOWLEDGMENTS

Appreciation is expressed to the Texas Peanut Producers Board for their support of this research. Tamrun OL07 was developed and released under a license agreement between the University of Florida Research Foundation and the Texas Agricultural Experiment Station.

NOTES

Registration by CSSA.

Received for publication June 22, 2006.

REFERENCES





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