Inheritance of resistance to the panicle-feeding bug Eurystylus oldi and the sorghum midge Stenodiplosis sorghicola in sorghum

Ratnadass, A. and Chantereau, J. and Coulibaly, M.F. and Cilas, C. (2002) Inheritance of resistance to the panicle-feeding bug Eurystylus oldi and the sorghum midge Stenodiplosis sorghicola in sorghum. Euphytica, 123 (1). pp. 131-138.

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Abstract

A study of the inheritance of Sorghum resistance to head-bug E. oldi and midge S. sorghicola has been conducted from an F1-based complete diallel involving four parental lines (namely head-bug resistant Malisor 84-7 and 87W810, and susceptible S 34 and ICSV 197). The trial was conducted at Samanko, Mali, under both natural and artificial head-bug infestation, in one date of sowing (DOS) in 1995 (22 July) and two DOS in 1996 (7 and 26 July). Head-bug visual damage scores (under both types of infestation) were indicated and analysed in all these trials. Head-bug numbers under artificial infestation on the two DOS of 1996, and midge damage score under natural infestation on the second DOS of 1996 were recorded. All four parents confirmed their expected level of resistance to head bugs, while ICSV 197 confirmed its resistance to midge. Diallel analyses showed that general combining ability (GCA) and thus additive gene effects were very important in the inheritance of resistance to both pests. Specific combining ability and maternal effects were generally of minor importance. Mean performance of the parents and their GCA effects were linked, which suggests high heritability. Head-bug resistant parents, Malisor 84-7 and 87W810, with high per se resistance and negative GCA should therefore be used in breeding for resistance to this pest, while for a similar reason, ICSV 197 should be used in breeding for midge resistance. Results concerning independence between resistance to head bugs and to midge, are also discussed

Item Type: Article
Author Affiliation: ICRISAT-CIRAD, BP 320, Bamako, Mali
Subjects: Plant Protection > Pests
Crop Improvement > Plant Breeding
Divisions: Sorghum
Depositing User: Mr B Krishnamurthy
Date Deposited: 13 Apr 2011 06:06
Last Modified: 13 Apr 2011 06:06
Official URL: http://dx.doi.org/10.1023/A:1014451103520
URI: http://eprints.icrisat.ac.in/id/eprint/1745

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