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USDA-ARS Corn and Soybean Research Unit, 1680 Madison Ave., Wooster, OH 44691
* Corresponding author (jones.390{at}osu.edu)
The maize (Zea mays L.) germplasm Oh1VI (Reg. no. GP-369, PI 614734) was developed by the USDA-ARS and the Ohio Agricultural Research and Development Center as a source of resistance for maize chlorotic dwarf waikavirus (MCDV). Oh1VI was selected from the Virgin Island population PI 504148. In 1992 at Wooster, OH, a collection of 167 maize accessions obtained from the North Central Regional Plant Introduction Station, Ames, IA, was evaluated for resistance to MCDV. Twelve plants of each accession were screened by multiple inoculations with the disease vector Graminella nigrifrons (Forbes)(Louie and Anderson, 1993). One symptomless plant in the Virgin Island population was identified and self-pollinated in the greenhouse. Progenies from this plant were subjected to two additional cycles of disease screening and ear-to-row self-pollination of symptomless plants. The line was then advanced by seven generations of ear-to-row self-pollination without selection. The end result of the screening and advancement process was a S9-derived S10 line.
A comparative test (1995 Wooster, OH) of Oh1VI with the MCDV resistant inbred line Mp705 (Pratt et al., 1994) and the susceptible inbred line Va35 was conducted by the multiple inoculation procedure. Inoculated and uninoculated plants were transplanted to the field for disease and agronomic trait assessment. Five plant plots were replicated four times and veinbanding symptoms were scored three times over a 14-d period by a disease severity scale of one (no symptoms) to five (severe symptoms). Area under the disease progress curve (AUDPC) scores were used to evaluate resistance. The mean AUDPC scores were 14.4 (Oh1VI), 25.4 (Mp705), and 53.2 (Va35). The AUDPC score for Oh1VI reflected limited veinbanding symptoms that were difficult to detect and slow to develop. Leaf tearing and chlorosis were not observed. Mean ear lengths of healthy (16.7 cm) and infected Oh1VI (15.2 cm) were not significantly different (P = 0.73). The plant height at the base of the flag leaf was also not significantly different (P = 0.64) for healthy (141.5 cm) and virus infected (133.6) plants. Plants had pink silks and the mean days to mid-silk was 98 d. Ears averaged 16 to 18 rows of orange flinty seeds, had a white cob and were prone to ear molds. Plants were also highly susceptible to smut [caused by Ustilago maydis (DC.) Cda.] infection.
The Department of Plant Pathology (Ohio Agricultural Research and Development Center, The Ohio State University, Wooster, OH 44691) will maintain seed of Oh1VI for at least 5 yr. Packets of 30 seeds will be distributed upon written request. Recipients of seed are asked to make appropriate recognition of the original seed source if it is used to develop a new population, parental line, or hybrid.
NOTES
Contribution of USDA-ARS in cooperation with the Ohio Agricultural Research and Development, The Ohio State University. Registration by CSSA.
Accepted for publication October 31, 2001.
REFERENCES
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