Diallel analysis of sooty stripe resistance in sorghum

Haussmann, B.I.G. and Hess, D.E. and Sissoko, I. and Kayentao, M. and Reddy, B.V.S. and Welz, H.G. and Geiger, H.H. (2001) Diallel analysis of sooty stripe resistance in sorghum. Euphytica, 122 (1). pp. 99-104.

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Sooty stripe (Ramulispora sorghi) is a widespread foliar disease of sorghum (Sorghum bicolor) in West Africa, responsible for grain yield losses up to 46%. We studied the inheritance of sooty stripe resistance in a 9×9 sorghum (cultivars Framida, Seredo, 555, N 13, IS 9830, M35-1, E 36-1, DJS 1195 and IS 1037) F2-population diallel grown together with parent lines and controls in 1996 under natural disease pressure at two locations (Samanko and Cinzana) in Mali. The percentage of infected leaf area was determined twice over a two-week interval during the season. At the second evaluation, the mean sooty stripe severity amounted to 13% infected leaf area at Samanko and 12% at Cinzana. The frequency distribution of the entries was approximately normal for the mean disease severity, averaged across assessment dates (2 and 13 August at Samanko, and 13 and 27 September at Cinzana) and locations, pointing to the involvement of multiple genes. With the data combined across the two locations, genetic differences among lines and among F2 populations were highly significant. Genotype × location interaction variances were also significant but much smaller than the genetic variances. Broad-sense heritability estimates were 0.92 for lines and 0.94 for the F2 populations, for the mean percentage infected leaf area across the two assessment dates. General combining ability effects (GCA) determined most of the differences among the F2 populations. Specific combining ability effects (SCA), and the interactions of GCA or SCA with locations were also significant but less important. Line performance per se was highly correlated with GCA. Because of the high heritability and predominance of additive effects, prospects are good for the genetic improvement of resistance to sooty stripe in sorghum in Mali, using simple pedigree or recurrent selection procedures

Item Type: Article
Author Affiliation: University of Hohenheim, 350 Institute of Plant Breeding, Seed Science, and Population Genetics, 70593 Stuttgart, Germany
Subjects: Plant Protection > Pests
Crop Improvement > Plant Breeding
Divisions: Sorghum
Depositing User: Mr B Krishnamurthy
Date Deposited: 13 Apr 2011 06:07
Last Modified: 13 Apr 2011 06:07
Official URL: http://dx.doi.org/10.1023/A:1012621729189
URI: http://eprints.icrisat.ac.in/id/eprint/1742

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