Inheritance of resistance to Stenocarpella macrospora (Earle) ear rot of maize in the mid-altitude zone of Nigeria

Rabiu Olatinwo*, Kitty Cardwell, Abebe Menkir, Mike Deadman, Angela Julian

*Corresponding author for this work

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Inheritance of resistance to Stenocarpella macrospora (Earle) Sutton (syn. Diplodia macrospora Earle) ear rot of maize was studied among selected maize populations in the mid-altitude (1280 m) agro-ecological zone of Nigeria. Diallel analysis among the populations showed significant values for general combining ability (GCA) and specific combining ability (SCA) effects at 5% and 1% levels respectively. Variance components of GCA and SCA on Stenocarpella ear rot were 0.019 and 0.627 respectively, indicating that non-additive genes play major roles in the inheritance of Stenocarpella ear rot resistance. The GCA and SCA effects were relatively dependent on the materials involved in the evaluations. Generation mean analysis was used on five selected parent inbreds (2 resistance and 3 susceptible crossed to give P1, P2, F1, BC1, BC2 and F2 generations). Estimates of the six parameters on ear rot indicate that dominance gene effects made the major contribution to variation in ear rot of maize in the crosses studied. The magnitude and significance of the estimates for digenic effects in the crosses suggest that epistatic gene effects are present and important in the basic mechanism of Stenocarpella ear rot inheritance in the populations studied. Additive effects have only minor importance in the total variation.

Original languageEnglish
Pages (from-to)535-543
Number of pages9
JournalEuropean Journal of Plant Pathology
Volume105
Issue number6
DOIs
Publication statusPublished - 1999

Keywords

  • Ear rot
  • Leaf blight
  • Maize
  • Mid-altitude
  • Stenocarpella macrospora

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Horticulture
  • Plant Science

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