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Evaluation of new
generation maize steak virus (MSV) resistant maize varieties
for adaptation to a southern guinea savanna ecology of
Nigeria
G. Olaoye
Department
of Agronomy, University of Ilorin, P. M. B. 1515, Ilorin,
Nigeria.
E-mail:
debolaoye@yahoo.com.
Accepted 7
May, 2009 |
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Five new
generations of maize streak virus (MSV) resistant varieties
were evaluated along with two checks in replicated trials
and for two years in a Southern Guinea Savanna Ecology of
Nigeria, which is an endemic zone for the disease.
Difference in grain yield between favourable growing season
in 2002 and unfavourable season in 2001 was
1.68 t/ha-1, representing 30.2% yield increase of
2001 performance. Results further showed that while both
rust and streak diseases appeared to have been put in check,
the genotypes showed slight susceptibility to leaf blight
and curvularia leaf spot, ranging from 5-7 and 4-8%,
respectively. Genotypic differences were significant for
grain yield, agronomic traits as well as incidences of leaf
blight and curvularia leaf spot. Acr 91 Suwan-1-SR C1
was the most productive of new generations of MSV resistant
varieties, having yielded significantly higher than OPV
check by 32% and comparable with the hybrid check for grain
yield. The variety could therefore serve as replacement to
existing cultivar and also as source of genes for future
maize breeding activities in the development of superior
maize varieties for the southern guinea savanna ecology.
Key
words:
Zea mays L., genotypes, grain yield, leaf diseases,
adaptation. |
