Maize Genomics and Genetics 2015, Vol.6, No.1, 1-5
3
Early composite, Line-20×Early composite, Line-2×
Girija, Line-7×Girija, Line-10×Girija, Line-18×
Girija, Line-19×Girija, Line-1×KH-2001, Line-5×
KH-2001, Line-6×KH-2001, Line-18×KH-2001 and
Line-19×KH-2001 during kharif 2004 and 2005.
Cross combinations moderately resistant to leaf
blight
The cross combinations
viz.,
Line-2×Early com-
posite, Line-9×Early composite, Line-11× Early
composite, Line-14×Early composite, Line-23× Early
composite, Line-1×Girija, Line-4×Girija, Line-7×
Girija, Line-10×Girija, Line-12×Girija, Line-19× Girija,
Line-21×Girija, Line-22×Girija, Line-1× KH-2001,
Line-2×KH-2001, Line-7×KH-2001, Line-10× KH-2001,
Line-12×KH-2001, Line-14×KH-2001, Line-15×
KH-2001, Line-20×KH-2001, Line-22× KH-2001
exhibited moderate resistant for leaf blight during
2004 as well as 2005. Similar results were reported
by Kumar and Singh (2002) and Garg et al. (2007).
Cross combinations moderately resistant to
brown spot
The cross combinations revealed moderate resi-
stant for brown spot
viz.,
Line-6×Early composite,
Line-12×Early composite, Line-14× Early composite,
Line-16×Early composite, Line-3× Girija, Line-5×
Girija, Line-6×Girija, Line-9×Girija, Line-11×
Girija, Line-13×Girija, Line-17×Girija, Line-20×
Girija, Line-22×Girija, Line-4×KH-2001, Line-8×
KH-2001, Line-12×KH-2001, Line-14× KH-2001,
Line-22×KH-2001 during 2004 as well as 2005.
Cross combinations moderately resistant to leaf
blight & brown spot diseases
The cross combinations
viz.,
Line-20×Early com-
posite, Line-6×Girija, Line-13×Girija, Line-20×
Girija, Line-12×KH-2001, Line-13×KH-2001,
Line-21×KH-2001, Line-23×KH-2001 presented
moderate infection for leaf blight and Line-24×
Girija, Line-10×KH-2001 for brown spot disease,
during 2004 and 2005. Similar results were also
reported by Sharma et al. (2002), Yang et al. (2005)
and Bhavana and Gadag (2009).
Parents & cross combinations showed consistent
performance in both the years
Among the parents used in the present study, four
lines
viz.,
Line-3, 8, 10, 18 showed resistance for leaf
blight as well as brown spot diseases, whereas
moderate resistance for these diseases was observed in
Lines-4, 6, 7, 12, 16 under natural conditions during
both the years. Therefore these lines should be used in
hybridization programmes for generating moderate
resistant hybrids. Four cross combinations
viz.,
Line-14×Early Composite, Line-22×Girija, Line-14×
KH-2001 and Line-22×KH-2001 showed moderate
resistance for leaf blight and brown spot during the
year 2004 as well as 2005.
The ten cross combinations Line-3×Early Composite,
Line-5×Early Composite, Line-10×Early Composite,
Line-13×Early Composite, Line-15×Early Composite,
Line-19×Early Composite, Line-18×Girija, Line-5×
KH-2001, Line-18×KH-2001 and Line-19×KH-2001
showed resistance for leaf blight and brown spot in
both the years along with desirable specific combining
ability for some of the traits under studied (Table 2).
These hybrids thus appear to be suitable for
cultivation in maize growing areas of Himachal
Pradesh where blight and brown spot are the
prominent diseases. Earlier worker, (Katna, 2000) has
reported that severity of leaf blight as well as brown
spot diseases was slightly more under Palampur
condition than that at Bajaura, perhaps due to scanty
rains received at location like Bajaura (Kullu).
Hence it was concluded from the present study that
the cross combinations, Line-13×Early Composite
and Line-19×KH-2001 showed resistance against
leaf blight and spot disease of maize with desirable
high specific combining ability (SCA) effects for
majority of traits in both the years under studied.
Therefore theses cross combinations recommended
for involving in crop improvement programmes.
Materials and Methods
Twenty four inbred lines (S-5 stage), derived from
local germplasm collected from different parts of
Himachal Pradesh were involved with three broad
based testers,
viz.,
Early composite, Girija composite
and KH-2001(hybrids) in a line×tester fashion. The
experimental material, comprising one hundred entries
(72 crosses, 27 parents and one standard check,
PMZ-4), was evaluated during
kharif
2004 and
2005
in a simple lattice design with two replications at the
Experimental Farm of Seed Production Unit, CSK
HPKV, Palampur. Each plot consisted of 5 rows of 4
meters length with inter and intra row spacing of 60
