Generation Mean Analysis for Turcicum Leaf Blight in Ugandan Sorghum

Sorghum (Sorghum bicolor (L.) Moench) is frequently devastated by Turcicum leaf blight, caused by Exserohilum turcicum, leading to considerable grain and fodder yield losses. However, the mechanism of inheritance of resistance to E. turcicum in sorghum is poorly understood. Studies were carried out in Uganda to determine the mode of inheritance of E. turcicum resistance in sorghum. Segregating families derived from a cross of MUC007/009 (resistant) and Epuripuri (susceptible, an elite sorghum variety) were used along with the two parents. This was done together with four checks, namely GAO6/106 (moderately resistant), Lulud (susceptible), MUC007/010 (resistant) and GAO6/18 (moderately susceptible). The results of this study suggest that resistance in sorghum to E. turcicum is quantitative, with some contribution of additive, dominance and epistatic effects. It also highlights that the effect of the environment on the disease response of specific sorghum genotypes can be major.
Le sorgho (Sorghum bicolor (L.) Moench) est fréquemment ravagé par la rouille foliaire Turcicum, causé par l’Exserohilumturcicum, conduisant à des pertes considérables de rendement en graines et en fourrage. Cependant, le mécanisme de l’hérédité de la résistance à E. turcicum dans le sorgho est mal compris. Des études ont été menées en Ouganda pour déterminer le mode de transmission de la résistance de E. turcicum dans le sorgho. Des familles en isolement, dérivées d’un croisement de MUC007/009 (résistant) et d’Epuripuri (sensible, une variété de sorgho élite) ont été utilisées avec les deux parents. Cela a été fait ensemble avec quatre contrôles, à savoir GAO6/106 (moyennement résistant), Lulud (sensible), MUC007/010 (résistant) et GAO6/18 (modérément sensible). Les résultats de cette étude suggèrent que la résistance du sorgho à E. turcicum est quantitative, avec une certaine contribution des effets additifs, de dominance et épistatiques.On souligne également que l’effet de l’environnement sur la réponse à la maladie des génotypes spécifiques de sorgho peut être majeur.
Extended abstracts submitted under Crop Improvement
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East Africa
RUFORUM Conferences and Workshops
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The 2012 RUFORUM Biennial Conference is the third in the series. The main objective of the Biennial conferences is to provide a platform for agricultural research for development stakeholders in Africa and beyond to actively exchange findings and experiences, while at the same time learning lessons towards improving performance of the agricultural sector and ultimately people’s livelihoods. The biennial conference is RUFORUM’s most comprehensive meeting for the diversity of stakeholers in agriculture. It is especially dedicated to graduate students and their supervisors, grantees in RUFORUM member universities and alumni. It is a platform for peer review, quality control, mentorship, networking and shared learning. The third Biennial Conference was attended by 657 participants.This record contains an extended abstract accepted under the theme of Crop Improvement