Sitta Et Al


Sitta et al

Greener Journal of Agricultural Sciences

Vol. 11(2), pp. 90-97, 2021

ISSN: 2276-7770

Copyright ©2021, the copyright of this
article is retained by the author(s)








Combining Ability for Resistance to Maize Lethal Necrosis Disease in



1Sitta, B.J., 2Nzuve, F.M., 2Olubayo,
C., 2Muthomi, J.W. 2Muiru, W.M., 2Miano, D.W.



Agricultural Research Institute (TARI) Dakawa Centre, P.O. Box 1892, Morogoro,

of plant science and Crop Protection, University of Nairobi, P O Box 29053-
00625, Nairobi, Kenya.








Type: Research



Maize is a natural host to more than 50
viruses including members of the Potyviridae group which in combination with
Maize Chlorotic mottle virus (MCMV) cause maize lethal necrosis leading to
high yield losses. A study involving an assortment of maize germplasm was
used to estimate the genetic effects attributable to the resistance to maize
lethal necrosis resistance. The maize genotypes were crossed in a North
Carolina design II to generate 25 crosses. The parents and their derivative
crosses were screened for their combining ability for MLN and associated
disease parameters. Among the parents involved in the study, only one parent
UON-2015-119 showed desirable GCA for all the traits implying diversity of
the rest of the material involved. Thus, the good combiners for the
different traits could be used to produce desirable transgressive segregants
to maximize the disease resistance. For the SCA effects, UON-2015- 50/
UON-2015-109, UON-2015-50 /UON-2015-112 and UON-2015-50 / UON-2015- 113
showed good values for all the disease parameters. These elite crosses had
the parent UON-2015- 50. The parent UON-2015- 50 showed poor GCA effects for
all the disease parameters. Also, the parent UON-2015-119 showed poor SCA
effects despite the desirable GCA effect for all the disease
parameters.  This implies that any
breeding method chosen should first accumulate favourable genes in
homozygous state while breaking the linkage blocks.  Also, non additive gene action
attributable to both additive x epistatic and dominance x dominance gene
interaction could be responsible for the resistance to the MLN.  The non additive gene action is also non
allelic and produces over-dominance which is non fixable. These superior
parents and crosses could be used to develop maize varieties to improve
maize production in Kenya.


Accepted:  03/06/2021

Published: 31/07/2021



Justo Sitta




General combining ability; specific combining ability; maize;
maize lethal necrosis disease.











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Cite this Article: Sitta, BJ; Nzuve, FM; Olubayo, C; Muthomi, JW; Muiru, WM; Miano, DW
(2021). Combining Ability for Resistance to Maize Lethal Necrosis Disease in
Kenya. Greener Journal of Agricultural
11(2): 90-97.


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