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STUDIES ON THE GENETIC ARCHITECTURE OF HARSHA COMPOSITE OF MAIZE (mays L.)

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Title STUDIES ON THE GENETIC ARCHITECTURE OF HARSHA COMPOSITE OF MAIZE (mays L.)
 
Creator SUBBA REDDY, M.V
 
Contributor SAI KUMAR, R
 
Subject STUDIES, GENETIC, ARCHITECTURE, HARSHA, COMPOSITE, MAIZE,
 
Description The genetic architecture of yield and its
components were studied by North Carolina Design I to
find out the appropriate selection scheme for intrapopulation
improvement in 'Harsha'.
The most important yield components were found
to be number of grains per ear, ear girth and 100
grain weight. Hence emphasis be laid on these
characters as selection criterion for yield improvement.
The genotypes (full-sibs), as well as males and
females differed significantly among themselves for all
the characters studied viz., grain yield, plant
height, ear height, ear length, ear girth, number of
grains per ear, 100 grain weight, days to 50 per cent
silk and days to 50 per cent dry husk.
The magnitude of female variance and dominance
component of genetic variance were higher than male
variance and additive variance, respectively for most of
the characters studied. Additive variance was
significant for plant height, ear height and 100 grain
weight~ The heritability estimates ranged trom low to
medium for all the characters studied, except for plant
height and 100 grain weight.
Assuming an intensity of 5 per cent selection
pressure, the expected genetic gain was higher with
full-sib selection scheme as compared to mass selection.
In both the selection schemes higher genetic gain was
obtained for plant height, ear height, number of grains
per ear and 100 grain weight.
The results indicate that higher genetic gain
for yield could be obtained in the base population of
'Harsha' composite by practicing more number of
selection cycles to exploit residual additive variance
with full-sib selection scheme, since the yield
components viz., number of· grains per ear, ear girth
and 100 grain weight which h ad significant positive
correlation with grain yield and among themselves with
medium to high heritability and with dominance variance
in early generations.
 
Date 2016-08-06T14:50:31Z
2016-08-06T14:50:31Z
1989
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/71301
 
Language en
 
Relation D3125;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD