Record Details

STUDIES ON THE COMPARISON OF PREDICTED AND ACTUAL PERFORMANCE OF DWARF AND DWARF X TALL DOUBLE CROSS HYBRIDS IN MAIZE (Zea mays L.)

KrishiKosh

View Archive Info
 
 
Field Value
 
Title STUDIES ON THE COMPARISON OF PREDICTED AND ACTUAL PERFORMANCE OF DWARF AND DWARF X TALL DOUBLE CROSS HYBRIDS IN MAIZE (Zea mays L.)
 
Creator SWARNALATHA DEVI, I
 
Contributor HABIBUDDIN AHMED KHAN
 
Subject STUDIES, COMPARISON, PREDICTED, ACTUAL, PERFORMANCE, DWARF, DOUBLE, CROSS, HYBRIDS, MAIZE
 
Description Sixty nine hybrids (double and double top
crosses) of maize viz., nineteen dwarfxdwarf, twenty
two tallxtall and twenty eight dwarfxtall were selected
on the basis of their superior predicted performance
for studying standard heterosis, correlations, path
coefficients and comparison of actual yield of the
crosses with predicted yield in comparison with DHM103.
The standard heterosis for dry grain yield .was
found to be significant in five crosses and all of them
were positive. As compared to dwarfxdwarf and
tallxtall crosses the dwarfxtall crosses were found to
be superior to the check DHM103. The highest yielding
dwarfxtall cross (DT28) was superior to the highest
yielding tallxtall cross (TT19) by 40.4 per cent, to
dwarfxdwarf cross (DD7) by 52.l per cent to the check
DHM103 by 93.6 per cent.
The investigation also revealed that the
crosses between dentxflint parents had comparatively
higher yields. Similar results were observed in
dwarfxtall hybrids due to genetic diversity in plant
stature and grain type .
The dwarfxdwarf double crosses in general
recorded more plant height and therefore more lodging
due to the presence of AR238 line as one of the parent
in seventeen out of nineteen crosses. Though the line
is reported to contain br2 gene, neither it was dwarf
nor stiff like true br2 genotypes stucied earlier.
Some other desirable br2 · line can be tried as a
substitute to AR238.
Lodging in dwarfxtall hybrids was 7.9 per
cent, tallxtall 6.0 per cent and dwarfxdwarf 12.9 per
cent. The check OHM103 recorded 15.7 per cent lodging.
There was no lodging in the highest yielding dwarfxtall
and tallxtall c.rosses. However the highest yielding
dwarfxdwarf double cross. recorded 25. 5 per cent lodging
most probably due to line AR 238.
· Correlation studies between predicted and
actual yield were negative but not significant. This
may be due to different environmental conditions of
testing single crosses and hybrids and studies on only
selected hybrids predicted to be high yielding.
Correlations between 100-seed weight and dry grain
weight per ear (0.289*), and total number of seeds per
ear and dry grain weight per ear (0.232*) were found to
be significant. Path coefficient studies showed that
100-seed weight and total number of seeds per ear had
higher direct effects.
Apart from yield and lodging the other aspects
considered for viability and large scale production of
the improved hybrids were maturity of the hybrids Per
se and synchronization of flowering of crosses in
commercial seed production fields.
Keeping all aspects inview proposed that the
hybrids 003, TT2, TT18, TT20, OT20, OT21, OT23, OT27
and OT28 be further evaluated to consider their
release for commercial cultivation.
 
Date 2016-08-20T11:54:41Z
2016-08-20T11:54:41Z
1990
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/73139
 
Language en
 
Relation D3457;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD.