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Genetic Divergence for Resistance to Shootfly, Atherigona soccata Rond. in Sorghum, Sorghum bicolor (L.) Moench and its Relationship with Heterosis*
Published online by Cambridge University Press: 19 September 2011
Abstract
Genetic diversity analysis was conducted on a set of 20 sorghum [Sorghum bicolor (L.) Moench] cultivars having resistance to shootfly (Atherigona seccata Rond.), originating from different geographic regions, and representing different taxonomic groups. The genetic diversity for shootfly resistance was assessed using multivariate analysis (D2 statistic and canonical variate analysis), and geographic/taxonomic divergence. The grouping of cultivars based on genetic divergence was found more accurate and relevant than that based on either geographic or taxonomie divergence. Both D2 and canonical variate analyses gave very similiar clustering patterns over the years analysed. Trichome density contributed mainly toward genetic divergence in shootfly resistance, followed by glossiness. Based on the presence or absence of these traits, the cultivars resistant to shootfly were classified into four major clusters. Resistant cultivars IS 844 and IS 1054 formed separate clusters over the years. Heterosis for shootfly resistance was found associated with genetic divergence but not with geographic or taxonomie divergence.
Résumé
L'analyse de la diversité génétique a été effectuée sur 20 cultivars de sorgho (Sorghum bicolor (L.) Moench) présentant la résistance à la mouche des pousses (Atherigona saccata Rond.). Ces souches ont été prises de régions géographiques différentes et ont représenté des groupes taxonomiques différents. La diversité génétique pour la résistance è la mouche des pousses a été évaluée à l'aide de l'analyse è plusieurs variables (analyse statistique D2 et analyse variable “D2 statistic and canonical variate analysis” et en utilisant la divergence géographique/taxonomique. On a trouvé que le groupement des cultivars basé sur la divergence génétique était plus précis et pertinent que celui basé sur la divergence géographique ou taxonomique. L'analyse D2 et l'analyse variable ont toutes les deux mis en évidence des configurations de grappe très identiques sur les années analysées. La divergence génétique chez la résistance à la mouche des pousses a été due principalement à lé densité des trichomes, suivie du caractère vernissé. Des cultivars résistants à la mouche des pousses ont été classés en quatre grappes principales selon la présence ou l'absence de ces traits. Au cours des années, les sources résistantes IS 844 et IS 1054 ont formé des grappes séparées. Les résultats ont mis en évidence que l'hétérosis pour la résistance à la mouche des pousses est liée à la divergence génétique, et non à la divergence géographique ou taxonomique.
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