Indian Society of Genetics & Plant Breeding

Genetic analysis of resistance to Turcicum Leaf Blight in semitemperate early maturing genotypes of maize (Zea mays)

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Turcicum leaf blight (Exserohilum turcicum) is the most
common and chronic disease of maize, especially in
Himalayan hilly region. Studies on inheritance of the
disease were conducted using six generations derived
from 4 susceptible (CM 128, V 327, V 128 and V 17) and 2
resistant inbred lines (V 335 and V 13) having early maturity
suited to hilly region. The 6 parents and their 15 F1’s, 15
F2’s, 15 BC1’s and 15 BC2’s, were studied for reaction to
turcicum leaf blight at 2 locations namely, Hawalbagh
Research Farm of Vivekananda Parvatiya Krishi
Anusandhan Sansthan, Almora during kharif 2000 and at
Sihora Farm, Rudrapur during rabi, 2000-01. Significant
additive and dominance variances were observed in most
of the crosses in the two environments mentioned above.
The study suggested that both additive and dominance
components were important in the inheritance of turcicum
leaf blight, the magnitude of additive component being
relatively higher than non-additive component. Gene
interactions and environment were also found to be
important. The resistant lines V 335 and V 13 were found
to be the best general combiners. Highly significant SCA
effects were observed in both environments in 3 crosses,
viz. V 327 x V 335, V 335 x V 17 and V 13 x V 128, which
involved one disease resistant parent. Significant GCA and
SCA variance also indicated that the additive and nonadditive components were important in the inheritance of
resistance to turcicum leaf blight in maize. Low to high
ns estimates were observed with good genetic advance,
especially at Hawalbagh during kharif 2000. The higher
estimates of additive component of variance, heritability
and genetic advance during kharif 2000 indicated that
selection for turcicum leaf blight resistance was likely to
be more effective at Hawalbagh during kharif than at
Rudrapur during rabi. Population improvement approach,
preferably, reciprocal recurrent selection may be followed
for the development of early maturing and turcicum leaf
blight resistant cultivars of maize, especially for the
Himalayan hilly region.

Keywords: Combining ability, Exserohilum turcicum, Generation mean, Heritability, Inheritance, Turcicum leaf blight


Year: 2010
Volume: 70
Issue: 1
Article DOI: N/A
Print ISSN: 0019-5200
Online ISSN: 0975-6906


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