Characterization of a diverse set of maize germplasm for resistance to infection by Aspergillus flavus and accumulation of aflatoxin

Abstract: 
Sources of resistance to A. flavus have been identified elsewhere but no such materials are currently available for use by the maize improvement program in Uganda. The goal of this study was to initiate breeding for resistance to the fungus by identifying maize inbred lines, testers and hybrids that show high resistance to Aspergillus flavus and field accumulation of aflatoxin through: (1) screening inbred lines, testers and hybrids for resistance, (2) determining general and specific combining ability associated with resistance and determining the relationship between traits associated with resistance. Results indicated a highly significant variation (P<0.001) in resistance among inbred lines and testers. Testcrosses also showed significant variability (P<0.05). Inbred lines showed a significant GCA for kernel infection rate while testers showed significant GCA for severity of infection (P<0.05). SCA for both kernel infection rate and severity was non significant.
Les sources de résistance à l’ A. flavus ont été identifiées ailleurs mais aucun matériau n’est actuellement disponible à l’usage par le programme d’amélioration de maïs en Ouganda. Le but de cette étude était de lancer le programme de lutte contre le mycète en identifiant les souches pures de mais, les échantillonstest et les hybrides de maïs qui montrent de haute résistance à l’accumulation d’ Aspergillus flavus et de champ de l’aflatoxine à travers : (1) l’examen des souches pures, des échantillonstest et des hybrides pour la résistance, (2) la détermination de la capacité de combinaison générale et spécifique associée à la résistance et la determination du rapport entre les traits liés à la résistance. Les résultats ont montré une variation fortement significative (P<0.001) de résistance parmi les souches pures et les échantillons-test. Les techniques de croisement ont montré aussi une variabilité significative (P<0.05). Les souches pures ont montré un GCA significatif pour le taux d’infection de grain tandis que les échantillons-test montraient un GCA significatif pour la sévérité de l’infection (P<0.05). SCA pour le taux d’infection et la sévérité de grain était non significatif.
Language: 
Date of publication: 
2010
Country: 
Region Focus: 
East Africa
University/affiliation: 
Collection: 
RUFORUM Conferences and Workshops
Licence conditions: 
Open Access
Access restriction: 
Form: 
Printed resource
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ISSN: 
E_ISSN: 
Edition: 
Extent: 
299-302
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"The 2010 RUFORUM Biennial Conference was the second 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. This record contains an extended abstract accepted under the theme diseases".