PAPER TITLE :MULTIVARIATE ANALYSIS OF AGRONOMIC TRAITS AND DISEASE RESPONSE OF INBRED LINES OF MAIZE (ZEA MAYS L.)

APPLIED TROPICAL AGRICULTURE | VOLUME 23 NUMBER 1 2018

Paper Details

  • Author(s) : Ogunniyan, D. J., Makinde, S. A., Akinbode, F. A. and Oduwaye, F. O.
  • Abstract:

Pattern of genetic diversity and traits inter-relatedness is of great importance to germplasm collectors and plant breeders for creating variability. Thirty-two maize inbred lines were evaluated in three locations in 2014 and 2015 to establish the distinction among them based on their agronomic traits and diseases infection, as well as relatedness of the maize traits. The trial was laid out in a Randomized Complete Block Design with three replicates for two years. Data were collected on agronomic traits of the maize. Incidence of streak (STK), blight (BLT), Curvularia (CURV) and rust (RST) were scored. The grain yield (GRY) and anthesis-silking-interval (ASI) were estimated. Data collected across the environments were pooled for analysis using analysis of variance, Pearson’s correlation, principal component analysis (PCA) and single linkage cluster analysis (SLCA). Effects of genotype (G), environment (E) and G × E were highly significant for all the traits. Mean GRY was 1639.7 kg ha-1 while mean days to anthesis, days to silking (DTS) and ASI were 58.7, 62.6 and 3.9 days, respectively. Scores for lodging, stay green and husk cover were low. GRY associated with ASI (0.45*), plant height (0.44*), ear height (0.42*), BLT (0.49*), CURV (0.38*), plant aspect (r=0.57***) and ear aspect (r=0.66***). The GRY, DTS, ASI and SG contributed mostly to variation among the lines. The high yielding lines were tolerant to major maize diseases, but BD74-31, TZEI 1, TZEI 4, BD74-55, TZEI 7, BD74-399 and BD74-170 were most suitable for hybrids development.  
Key words: Maize disease, cluster analysis, inbred lines, PCA