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Registration of ‘Durana’ White Clover

^a Dep. Crop and Soil Sciences, Univ. of Georgia, Athens, GA 30602
^b AgResearch Ltd., Tennent Drive, Palmerston North, New Zealand

^* Corresponding author (jbouton{at}uga.edu)

‘Durana’ white clover (Trifolium repens L.) (Reg. no. CV-7, PI 633852) was developed by the University of Georgia Agricultural Experiment Stations and AgResearch Ltd. (New Zealand). It was tested experimentally as GA-43 and GC90.

Durana is an 84-parent synthetic variety tracing to 192 naturalized ecotypes collected from perennial grass pastures near Eatonton, GA. These 192 ecotypes were intermated and seed from the best 12 ecotypes based on seed-yielding ability were then established into a half-sib progeny performance trial to determine their grazing persistence in grass swards. The 7 best progeny genotypes from within each of the 12 half-sib families were then selected from this grazing persistence trial (84 total parental genotypes), intermated in field isolation in a replicated crossing block, and all seed from each genotype bulked to produce the prebreeder seed (Syn 1 generation). Breeder seed (Syn 2 generation) was increased in isolation from the prebreeder's seed.

Durana, an intermediate type white clover, is intended for use as a renovation legume for grass pastures in the southeastern U.S.A. It is a persistent, low-growing, densely spreading, profuse-flowering cultivar with a leaf color equivalent to green class 143A on the Royal Horticultural Society Color Chart (Anonymous, 1995). Its persistence when compared to ladino cultivars and its ability to enhance animal gains on both endophyte-infected and endophyte-free tall fescue pastures without the need for nitrogen fertilizer was found to be economically important (Bouton, 2003).

Durana is similar to ‘Louisiana S-1’ in heading date and frequency of cyanogenic plants. Cluster analysis based on SSR markers also showed a distinct dendrogram grouping for Durana that differed from ‘Grasslands Huia’, ‘Grasslands Sustain’, and ‘Regal’ (Jahufer et al., 2003). Durana differs from Regal in having more stolon growing points per unit area, shorter plant height, smaller leaflets, shorter petioles, earlier heading date, greater number of seedheads per plant, and a higher frequency of cyanogenic plants. Durana differs from Grasslands Huia in having more stolon growing points per unit area, shorter petioles, earlier heading date, more seedheads per plant, and higher frequency of cyanogenic plants. Durana differs from Grasslands Sustain in having more stolon growing points per unit area, shorter (height) but wider plants (length and width), smaller leaflets, shorter petioles, an earlier heading date, greater number of seedheads per plant, and a higher frequency of cyanogenic plants.

Seed increase is limited to one generation each of Breeder (Syn 2), Foundation (Syn 3), Registered (Syn 4), and Certified (Syn 5) seed classes. A 1-, 2-, 2-, and 2-yr stand life is permitted on fields producing Breeder, Foundation, Registered, and Certified classes, respectively. Minimum isolation distances for crops of less than 2 ha will be 200 m for Foundation and Registered crops and 100 m for Certified crops. These isolation distances reduce to 100 m and 50 m, respectively, for crops more than 2 ha.

Application was made for U. S. Plant Variety Protection on 1 Aug. 2003 (PVP 200300305). Seed production and marketing rights were exclusively assigned to Pennington Seed, Inc. Madison, GA, and Agricom, Ashburton, New Zealand.

ACKNOWLEDGMENTS

Appreciation is extended to John Andrae, Carl Hoveland, Mark McCann, Jane Parish, and Richard Watson for their collaboration in performance data collection. We also thank Vaughn Calvert, Frank Newsome, Jason Strickland, Jenny Wood, and Phil Worley for technical assistance.

NOTES

Research was supported by State and Hatch funds allocated to the Georgia Agric. Exp. Stns., and grants from AgResearch Ltd., Pennington Seed, Inc., and Agricom, Ashburton, New Zealand. Registration by CSSA.

Accepted for publication August 31, 2004.

REFERENCES

• Anonymous. 1995. RHS color chart. The Royal Horticultural Society. London.
• Bouton, J.H. 2003. New forage cultivars developed with the farmer in mind. p. 167–171. In K. Cassida (ed.) Proc. Am. Forage and Grassland Council. 26–30 April 2003. Lafayette, LA.
• Jahufer, M.Z.Z., B.A. Barrett, A.G. Griffiths, and D.R. Woodfield. 2003. DNA fingerprinting and genetic relationships among white clover cultivars. Proc. N.Z. Grassl. Assoc. 65:163–169.

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