Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 27:18-21 (1987)
© 1987 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Genetic Variability and Heritability for Resistance to Early Leafspot in Four Crosses of Virginia-Type Peanut1

C. C. Green and J. C. Wynne2

The potential for the development of large-seeded, high-yielding cultivars in peanut (Arachis hypogaea L.) with improved resistance to early leafspot (Cercospora arachidicola Hori) was determined in four crosses. A large-seeded, high-yielding cultivar (xNC 6x) was crossed to four small-seeded, low-yielding genotypes (PI 109839, PI 270806, PI 269685, and ‘Kanyoma’) with reported resistance to early leafspot. Estimates of additive and additive x additive genetic variance for lesion count were determined for each cross and used to estimate narrow-sense heritabilities. Realized heritabilities were determined after one generation of selection among F5 lines for high and low lesion count. Additive genetic variance was greater than the additive x additive genetic variance in the crosses NC 6 x PI 109839, NC 6 x PI 270806, and NC 6 x PI 269685, whereas only additive x additive genetic variance was found in the cross NC 6 x Kanyoma. The variance-component heritability estimates were moderate to high for resistance to early leafspot, ranging from 0.41 to 0.78. Estimates of realized heritability, which ranged from 0.45 to 0.57, were similar to the variance-component estimates.

Key Words: Arachis hypogaea L. • Cercospora arachidicola Hori • Additive genetic variance • Additive x additive genetic variance • Epistatic genetic variance • Realized heritability

1 Paper no. 10165 of the Journal Series of the North Carolina Agric. Res. Serv., Raleigh, NC 27695-7601. This research is part of the senior author's Ph.D, dissertation and was partially supported by the Peanut CRSP, USAID grant no. DAN-4048-G-SS-2065-00. Recommendations do not represent an official position or policy of USAID.

2 Graduate assistant and professor, respectively, Dep. of Crop Science, North Carolina State Univ., Raleigh, NC 27695-7629.

Received for publication October 28, 1985.




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Copyright © 1987 by the Crop Science Society of America.