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GERMPLASMS

Registration of Peanut Germplasm Line TifGP-1 with Resistance to the Root-Knot Nematode and Tomato Spotted Wilt Virus

^a USDA-ARS
^b Dep. of Plant Pathology, University of Georgia, Coastal Plain Exp. Station, Tifton, GA 31793

^* Corresponding author (Corley.Holbrook{at}ars.usda.gov).

TifGP-1 (Reg. No. GP-126, PI 648354) is a runner-type peanut (Arachis hypogaea L. subsp. hypogaea var. hypogaea) germplasm line that was released by the USDA-ARS and the Georgia Agricultural Experiment Stations in 2006. This material was released based on resistance to both tomato spotted wilt caused by Tomato spotted wilt virus (TSWV) and the peanut root-knot nematode [Meloidogyne arenaria (Neal) Chitwood]. It was developed at the University of Georgia Coastal Plain Experiment Station, Tifton, GA, and was tested under the experimental designation C209-6-13.

Segregating interspecific material that originated from a cross of A. hypogaea (PI 261942) with A. cardenasii (GKP 10017, PI 262141) was obtained from North Carolina State University. TifGP-1 originated from a cross of this segregating interspecific material with the cultivar MARC I (Gorbet et al., 1992). The population was advanced to the F₄ using single-seed descent. Individual F₄ plants were harvested. The population was then subjected to selection pressure for resistance to M. arenaria using a greenhouse screening technique (Holbrook et al., 1983), and for resistance to TSWV using a field screening technique (Culbreath et al., 1997). TifGP-1 is a small runner market-type in seed and pod size. Based on standard peanut plant descriptors (Pittman, 1995), it is a medium size with a bunch growth habit and a mainstem that is not apparent during the growing season or at harvest. It is a medium maturity class peanut, with about 135 d needed for optimal maturity.

TifGP-1 is the first peanut germplasm reported to have resistance to both TSWV and the peanut root-knot nematode, and the first interspecific germplasm reported to have resistance to TSWV. In two separate greenhouse studies (Holbrook et al., 2003), TifGP-1 supported reproduction rates for M. arenaria of 3983 and 3552 eggs g^–1 fresh root which was significantly (P < 0.05) less than that observed for ‘Georgia Green’ (Branch, 1996) at 19673 and 6172 eggs g^–1 fresh root. In field studies (Holbrook et al., 2003), TifGP-1 exhibited significant (P < 0.05) reductions in incidence of TSWV (8%) in comparison to ‘COAN’ (Simpson and Starr, 2001) and Georgia Green (36 and 22%, respectively). Timper et al. (2003) also observed a significant reduction in M. arenaria reproduction on TifGP-1 in comparison to Georgia Green. Based on the pedigree and the phenotypic observations, we believe that TifGP-1 contains some unique genes for resistance to these two pathogens (Holbrook et al., 2003).

Seed of TifGP-1 has been deposited in the National Plant Germplasm System, where it will be available for research purposes, including development and commercialization of new cultivars. Appropriate recognition is requested if this release contributes to the development of a new breeding line or cultivar.

Acknowledgments

We thank Dr. H. Thomas Stalker at North Carolina State University for providing seeds of the original interspecific material. The contributions and technical assistance of David Clements, Jason Golden, Vickie Hogan, Kathy Marchant, D. Mauldin, Adam Montfort, Betty Tyler, and William Wilson are gratefully acknowledged. This work was supported in part by the Georgia Peanut Commission.

Footnotes

All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Permission for printing and for reprinting the material contained herein has been obtained by the publisher.

Received for publication April 5, 2007.

References

• Branch, W.D. 1996. Registration of ‘Georgia Green’ peanut. Crop Sci. 36:806.[Free Full Text]
• Culbreath, A.K., J.W. Todd, D.W. Gorbet, F.M. Shokes, and H.R. Pappu. 1997. Field response of new peanut cultivar UF 91108 to tomato spotted wilt virus. Plant Dis. 81:1410–1415.[CrossRef]
• Gorbet, D.W., D.A. Knauft, and A.J. Norden. 1992. Registration of ‘MARC I’ peanut. Crop Sci. 32:279.[Free Full Text]
• Holbrook, C.C., D.A. Knauft, and D.W. Dickson. 1983. A technique for screening peanut for resistance to Meloidogyne arenaria. Plant Dis. 67:957–958.[CrossRef]
• Holbrook, C.C., P. Timper, and A.K. Culbreath. 2003. Resistance to tomato spotted wilt virus and root-knot nematode in peanut interspecific breeding lines. Crop Sci. 43:1109–1113.[Abstract/Free Full Text]
• Pittman, R.N. 1995. United States peanut descriptors. ARS-132, USDA-ARS. U.S. Gov. Print. Office, Washington, DC.
• Simpson, C.E., and J.L. Starr. 2001. Registration of ‘COAN’ peanut. Crop Sci. 41:918.[Free Full Text]
• Timper, P., C.C. Holbrook, and W.F. Anderson. 2003. Reproduction of Meloidogyne spp. on resistant peanut genotypes from three breeding programs. J. Nematol. 35:417–421.

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