Registration of `OK 169' alfalfa. (Registrations Of Cultivars).
Forage yield production in Oklahoma for OK 169 was evaluated for four generations, syn 0 (seed blended from seven experiments) to syn 3, as part of our alfalfa cultivar testing program, and the results are presented as a percentage of the test means. Syn 0 averaged 102.4% in eight tests for three production years. Syn 1 averaged 103.0% in three tests for three production years. Syn 2 averaged 103.1% in four tests for three production years. Syn 3 averaged 102.4% in seven tests for three production years and four tests for one production year. Considering 100% is the average of the entries in each test, OK 169 averaged about 3% higher than average, which is as good as any well-tested cultivar from public or private breeding programs. These forage yield results illustrate the stability across generations for this genetically broad base population. OK 169 may be used for hay, haylage, or nonabusive grazing by livestock.
Standard pest resistance tests (North American Alfalfa Improvement Conference, 1999) indicate OK 169 has high resistance to Fusarium wilt [caused by Fusarium oxysporum Schlechtend.:Fr. f. sp. medicaginis (Weimer) W.C. Snyder & H.N. Hans], resistance to bacterial wilt [caused by Clavibacter michiganensis subsp. insidiosus (McCulloch)], and the spotted alfalfa aphid [Therioaphis maculata (Buckton)]. It exhibits moderate resistance to Phytophthora root rot (caused by Phytophthora megasperma Drechs.) and low resistance to anthracnose (caused by Colletotrichum trifolii Bain & Essary) and the blue alfalfa aphid (Acyrthosiphon kondoi Shinji), biotype BAOK90, collected in Oklahoma. On the basis of parentage, it also probably possess low-to-moderate resistance to Verticillium wilt (caused by Verticillium albo-atrum Reinke & Berthier), and pea aphid [A. pisum (Harris)].
Seedling tests for resistance to the spotted alfalfa aphid and to blue alfalfa aphid were conducted at Stillwater, OK. The percentages of seedlings exhibiting resistance after infestation with aphids collected in Oklahoma were: spotted alfalfa aphid - OK 169 = 42, `Baker' (R) = 50, and `Caliverde' (S) = 2; and blue alfalfa aphid - OK 169 = 15, `CUF 101' (R) = 29, and Arc (S) = 4 [(R) = Resistant; (S) = Susceptible]. Tests for resistance to the following diseases were conducted by Crop Characteristics, Inc., Farmington, MN, and presented as percent resistant plants: Fusarium wilt - OK 169 = 56, `Agate' (R) = 54, MNGN-1 (S) = 5; bacterial wilt - OK 169 = 38, `Vernal' (R) = 42, `Narragansett' (S) = 2; Phytophthora root rot - OK 169 = 26, Agate (R) = 43, `Saranac' (S) = 5; and anthracnose (race 1) - OK 169 = 13, Arc (R) = 65, Saranac (S) = 3.
Fall dormancy for OK 169 is approximately 4.6, compared with Saranac = 4 and Archer = 5 (1 to 9 scale, where 9 is very non dormant). Flower color for OK 169 is about 95% purple and 5% variegated. Estimation of contributions from each of the major alfalfa germplasm groups is impossible because there was no way of knowing the pollen contribution of any of the diverse parental cultivars or germplasms.
Seed increase is limited to syn 2 generation for Breeder, syn 3 for Foundation, and syn 4 for Certified classes. Maximums of three and five harvest years are permitted for fields producing Foundation and Certified seed, respectively. Seed shall be sold by cultivar name only as a class of Certified seed. Production and marketing rights will be exclusively assigned by the Oklahoma Agricultural Experiment Station to a licencee, who may apply for plant variety protection.
Fifty grams of syn 3 seed will be provided to upon written request to the corresponding author and agreement to make appropriate recognition of its source when this germplasm contributes to the development of a new germplasm, cultivar, hybrid, or strain cross. Request for seed from outside the USA should be accompanied by the appropriate customs and control documents.
J.L. CADDEL, * A.A. ZARRABI, AND J.D. PRATER
Caddel, J.L., R.C. Berberet, K.T. Shelton, and A.A. Zarrabi. 1992a. Registration of `OK 49' alfalfa. Crop Sci. 32:280.
Caddel, J.L., R.C. Berberet, A.A. Zarrabi, and K.T. Shelton. 1992b. Registration of OK 51 alfalfa germplasm. Crop Sci. 32:839.
Devine, T.E., R.H. Ratcliffe, C.M. Rincker, D.K. Barnes, S.A. Ostazeski, T.H. Busbice, and C.H. Hanson. 1975. Registration of `Arc' alfalfa. Crop Sci. 15:97.
Hanson, A.A., J.L. Kugler, D.E. Huset, F.L. Bedard, M.A. Peterson, and S.A. Ostazeski. 1987a. Registration of `WL Southern Special' alfalfa. Crop Sci. 27:1083.
Hanson, A.A., J.L. Kugler, D.E. Huset, M.A. Peterson, S.A. Ostazeski, and F.L. Bedard. 1987b. Registration of `WL 320' alfalfa. Crop Sci. 27:1084.
Moutray, J.B. 1983. Registration of `Apollo' alfalfa. Crop Sci. 23:178.
North American Alfalfa Improvement Conference. 2000. Cultivars registered before year 2000 [Online]. Available at http://www. naaic.org/varietyaps/lists/VarietyAps.html; verified August 1, 2001. (Cultivar descriptions approved by the National Alfalfa Variety Review Board includes most cultivars that contributed to OK 169.) North American Alfalfa Improvement Conference. 1999. Standard Tests to Characterize Alfalfa Cultivars. 3rd ed. [Online]. Available at http://www.naaic.org/stdtests/index.html; verified August 1, 2001.
Woodward, W.T.W., G.E. Hoard, D.L. Jessen, D.J. Miller, L.D. Satterlee, and M.A. Smith. 1990. Registration of `5364' alfalfa. Crop Sci. 30:230.
Woodward, W.T.W., and J.W. Miller. 1989. Registration of `555' alfalfa. Crop Sci. 29:486.
Woodward, W.T.W., J.W. Miller, L.D. Eckman, L.K. Edmunds, G.E. Hoard, B.J. Hartman, L.M. Nash, and E.F. Poynor. 1987. Registration of `5432' alfalfa. Crop Sci. 27:1305.
J.L. Caddel and J.D. Prater, Dep. of Plant and Soil Sciences, A.A. Zarrabi, Dep. of Entomology and Plant Pathology, Oklahoma State Univ., Stillwater, OK 74078-6028. Contribution from the Oklahoma Agric. Exp. Stn. Registration by CSSA. The authors acknowledge Crop Characteristics, Inc., Farmington, MN, for evaluation of this cultivar. Accepted 31 July 2001. * Corresponding author (firstname.lastname@example.org. okstate.edu).
Published in Crop Sci. 42:308-309 (2002).
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|Author:||Caddel, J.L.; Zarrabi, A.A.; Prater, J.D.|
|Date:||Jan 1, 2002|
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