Combining ability and performance of maize hybrids under low nitrogen and drought stress

Abstract: 
The main objective of this study was to develop maize genotypes that perform well under drought and low-nitrogen stresses. Twelve parents were crossed in a half-diallel mating design. The resultant F1 hybrids were evaluated in four environments; optimum N and low N, well-watered and drought-stressed environments. Also, the 12 parents and their resultant single cross hybrids were crossed with two elite testers, and the test crosses were evaluated under optimum and low N. The experimental design was an alpha-lattice with two replications. Across-site/environment analysis revealed variation among hybrids and environments, with both GCA and SCA effects significant.
L’objectif principal de cette étude était de développer les génotypes de maïs qui on une bonne performance sous des efforts de sécheresse et de faible azote. Douze parents ont été croisés dans une conception d’accouplement à moitié-diallèle. Les hybrides F1 résultants ont été évalués dans quatre environnements; celui de N optimal et de faible N, des environnements bien-arrosé et soumis à une contrainte de sécheresse. En outre, les 12 parents et leurs hybrides croisés simples résultants ont été croisés avec deux échantillons-test d’élite, et les croisements d’essai ont été évaluées sous N optimal et N faible. La conception expérimentale était un trellisalpha avec deux répliques. L’analyse du site de travers/de l’environnement a indiqué la variation parmi les hybrides et les environnements, avec des effets significatifs de GCA et de SCA.
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
Publisher: 
Extent: 
515-518
Notes: 

About the RUFORUM 2010 Biennal Conference
"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 stakeholders 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 of Plant Breeding"