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REGISTRATION OF GERMPLASM

Registration of M1-2 Beet Germplasm Resistant to Root-Knot Nematode

USDA-ARS-PWA, U.S. Agric. Res. Stn., Crop Improvement and Protection Research Unit, 1636 East Alisal St., Salinas, CA 93905-3018

* Corresponding author (myu{at}salinas.ars.usda.gov)

Beet [Beta vulgaris ssp. maritima (L.) Arcang] germplasm line M1-2 (Reg. no. GP-218, PI 614899) was developed by the USDA-ARS in cooperation with the California Beet Growers Association, Ltd. and jointly released in July 2000. This germplasm line is resistant to root-knot nematode, Meloidogyne spp.

The initial seed of M1-2 was produced by interpollinating 40 root-knot nematode resistant plants selected from over 250 second generation Mi-1 (PI 593237) progeny (Yu, 1997). It is highly resistant, if not immune, to root-knot nematode. M1-2 is a multigerm, partially self-compatible germplasm line with a high percentage (85% or more) of plants exhibiting annual bolting habit and pigmentation. The roots are fanged or sprangled (to a lesser degree than Mi-1) with a medium fiber texture. M1-2 is resistant to several species of root-knot nematode, including M. incognita (Kofoid and White) Chitwood, M. javanica (Treub.) Chitwood , M. arenaria (Neal) Chitwood, M. hapla Chitwood, M. chitwoodi Golden et al., and M. fallax Karssen (Yu et al., 1999). Both M1-2 and M6-1 (PI 613165) (Yu, 2001) are resistant to root-knot nematode, but their reactions to phosphoglucomutase (PGM) isozyme stain on starch gels are different. All F₁ progeny of M1-2 produce a parental PGM banding pattern that is associated with root-knot nematode resistance (Yu et al., 2001). However, such a reaction has not been observed with M6-1 and its progeny. This suggests that resistance to Meloidogyne spp. in M1-2 and M6-1 is of different origin or conditioned by different genes or alleles.

Breeder seed will be maintained by the USDA-ARS and provided to sugarbeet breeders and researchers in small quantities upon written request. Recipients of seed are requested to make appropriate recognition of the source if M1-2 contributes to the development of a new population, parental line, cultivar, or hybrid. U.S. Plant Variety Protection for M1-2 will not be applied for.

ACKNOWLEDGMENTS

The author thanks Dr. R.T. Lewellen for the sugarbeet stecklings used in greenhouse pollination. The technical assistance of L.M. Pakish and G.H. Gretz is gratefully acknowledged.

NOTES

Cooperative Investigations by the USDA-ARS and the California Beet Growers Association, Ltd., 2 West Swain Rd., Stockton, CA 95207. Registration by CSSA.

Accepted for publication July 31, 2001.

REFERENCES

• Yu, M.H. 1997. Registration of Mi-1 root-knot nematode resistant beet germplasm line. Crop Sci. 37:295.[Free Full Text]
• Yu, M.H. 2001. Registration of M6-1 root-knot nematode resistant sugarbeet germplasm. Crop Sci. 41:278–279.[Free Full Text]
• Yu, M.H., W. Heijbroek, and L.M. Pakish. 1999. The sea beet source of resistance to multiple species of root-knot nematode. Euphytica 108:151–155.
• Yu, M.H., L.M. Pakish, and H. Zhou. 2001. An isozyme marker for resistance to root-knot nematode in sugarbeet. Crop Sci. 41:1051–1053.[Abstract/Free Full Text]

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