Reaction of Waxy and Opaque-2 Inbreds and their Derived Progenies to Multiple Foliar Diseases of Maize in Uganda
Loading...
Date
2012
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Agricultural Science
Abstract
Specialty maize lines possessing important endosperm genes waxy and/or opaque-2 enhance processing and
nutritional qualities of the grain. However, production and utilization of specialty maize varieties for food, feeds
and various industrial end-uses are constrained by endemic foliar diseases of maize including turcicum leaf
blight, gray leaf spot and maize streak virus disease. The purpose of this study was to investigate the reaction of
two specialty maize genotypes (waxy and opaque-2) and their derived F1, F2 and backcross progenies to multiple
foliar diseases of maize. A randomized complete block design was used to evaluate these materials under field
conditions in Uganda. Significant differences among populations were observed for susceptibility to turcicum
leaf blight and maize streak virus disease. The opaque-2 inbred CML182 did not manifest any maize streak virus
disease symptoms during the assessment period. Significant differences were observed for susceptibility to
maize streak virus disease between reciprocal crosses but not for turcicum leaf blight suggesting possible
maternal effects associated with maize streak virus disease resistance. Susceptibility to turcicum leaf blight and
maize streak virus disease was associated with the recessive endosperm genes (waxy and opaque-2). These
results show that developing waxy and opaque-2 specialty maize varieties with good agronomic and grain
quality attributes is dependent on the choice of parents carrying important resistance as well as endosperm
modifying genes.
Description
Keywords
Maize streak mastrevirus, Exerohilum turcicum, Zea-mays, foliar diseases, Uganda
Citation
Bombom, A., Okori, P., Gibson, P., Edema, R., Asea, G., & Rubaihayo, P. (2012). Reaction of waxy and opaque-2 inbreds and their derived progenies to multiple foliar diseases of maize in Uganda. Journal of Agricultural Science, 4(10), 199. doi:10.5539/jas.v4n10p199