Genetic effects of inbreeding on harvest index and root dry matter content in cassava

Inbreeding of predominantly cross-pollinating crops is expected to result in progeny with reduced fitness and or improved phenotypes. The effects of inbreeding in cassava are not well quantified. Accordingly, in this exploratory study, S1 progeny from six cassava genotypes were examined for two agronomic traits harvest index (HI) and root dry matter content (DMC). With introduction of inbreeding, an average HI reduction of 36% was recorded when six non-inbred parents were compared to the S1 progeny. Similarly, an average DMC reduction of 13.2% was observed with cassava inbreeding. Thus, with inbreeding, highest reduction was observed in HI as compared to DMC.
L’endogamie des cultures principalement à pollinisation croisée est attendue pour avoir pour résultat la descendance avec la forme physique réduite et / ou des phénotypes améliorés. Les effets de l’endogamie dans le manioc ne sont pas bien quantifiées. Par conséquent, dans cette étude exploratoire, les descendances S1 de six génotypes de manioc ont été examinées pour l’’indice de récolte (HI) de deux traits agronomiques et teneur en matière sèche (DMC) de la racine. Avec l’introduction de l’endogamie, une réduction moyenne de 36% de HI a été enregistrée alors que six parents non consanguins ont été comparés à la descendance S1. De même, une réduction moyenne de 13,2% de DMC a été observée avec la consanguinité du manioc. Ainsi, avec l’endogamie, la plus forte baisse a été observée dans l’indice de récolte HI par rapport à la teneur en matière sèche.
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Africa Wide
RUFORUM Conferences and Workshops
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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"