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Componental analysis of the factors influencing resistance to sorghum midge, Contarinia sorghicola Coq.*

Published online by Cambridge University Press:  19 September 2011

H. C. Sharma ,
P. Vidyasagar  and
K. Leuschner
H. C. Sharma
Affiliation:
International Crops Research Institute for the Semi-Arid Tropics (ICRISAT)Patancheru, A.P. 502 324, India
P. Vidyasagar
Affiliation:
International Crops Research Institute for the Semi-Arid Tropics (ICRISAT)Patancheru, A.P. 502 324, India
K. Leuschner
Affiliation:
International Crops Research Institute for the Semi-Arid Tropics (ICRISAT)Patancheru, A.P. 502 324, India
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Abstract

Studies were conducted on components of resistance to sorghum midge on four resistant (DJ 6514, AF 28, TAM 2566 and IS 15107) and two susceptible (CSH 1 and Swarna) cultivars. Short floral parts, faster rate of grain development and high tannin content of grain were apparently associated with resistance to sorghum midge, Contarinia sorghicola Coq. Genotypic and phenotypic correlations between the factors associated with resistance to sorghum midge were in the same direction (positive or negative) as their association with resistance to this insect. Glume g2, lemma 12, anther and lodicule length, rate of grain development based on dry weight (except oviposition), and tannin content of mature grain showed correlation and path coefficients (direct effects) in the same direction. These characters can serve as a useful criteria to select for resistance to sorghum midge.

Using D2 and canonical cluster analysis, AF 28 was found to be distinct from other sources of midge resistance. However, based on larvae/100 florets, DJ 6514 was also placed distantly from TAM 2566 and IS 15107. Based on egg numbers, adults emerged and grain damage, DJ 6514 was grouped with TAM 2566 and IS 15107. Susceptible hybrid check, CSH 1 was generally placed distantly from the self pollinated susceptible variety, Swarna. These results indicate that the sources of resistance to sorghum midge are diverse, and there is a distinct possibility of increasing the levels and diversity of resistance to this insect.

Résumé

Analyse des composantes des facteurs qui influencent la résistance à la cécidomyie du sorgho Contarinia sorghicola Coq.: Des études ont été effectuées sur les composantes de la résistance à la cécidomyie du sorgho portant sur quatre cultivars résistants (DJ 6514, AF 28, TAM 2566 et IS 15107) et deux cultivars sensibles (CSH 1 et Swarna). Des parties florales courtes, un développement plus rapide des graines, ainsi qu'une teneur élevée en tanin de la graine étaient apparemment associés avec la resistance à la cécidomyie du sorgho Contarinia sorghicola Coq. Des corrélations génotypiques et phénotypiques entre les facteurs asssociés avec la résistance à la cécidomyie avaient la même orientation (positive ou négative) que leur association avec la résistance à cet insecte. La glume g2, la glumelle inférieure 12, la longueur de l'anthére et de la lodicule, le développement de la graine par rapport au poids sec (sauf ponte), et la teneur en tanin de la graine mure ont montré une corrélation et des path-coefficients (effets directs) dans la même orientation. Ces caractéres peuvent servir de critéres utiles de sélection pour la résistance à la cécidomyie.

L'utilisation de D2 et l'analyse en grappes canonique a permis de mettre en évidence que AF 28 était distinct des autres sources de résistance à la cécidomyie. Cependant, par rapport au nombre de larves/100 florets, DJ 6514 était également éloigné de TAM 2566 et IS 15107. Par rapport aux nombres d'oeufs, nombre d'adultes émergés, et endommagement des graines, DJ 6514 était groupé avec TAM 2566 et IS 15107. Le témoin hybride sensible, CSH 1 était généralement éloigné de la variété sensible autogame, Swarna. Ces résultats indiquent que les sources de résistance à la cécidomyie sont diverses, et qu'il existe une possibilité distincte d'amélioration des niveaux et de la diversité de la résistance à cet insecte.

Keywords

SorghumContarinia sorghicolaresistancecomponental analysisSorghoContarinia sorghicolarésistanceanalyse des composantes
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 11 , Issue 6 , December 1990 , pp. 889 - 898
Copyright
Copyright © ICIPE 1990

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