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STABILITY ANALYSIS IN MAIZE (Zea mays L.)

KrishiKosh

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Title STABILITY ANALYSIS IN MAIZE (Zea mays L.)
 
Creator USHA RANI, G
 
Contributor SATYANARAYANA RAO, V
 
Subject STABILITY, ANALYSIS, MAIZE
 
Description The present investigation was carried out at Agricultural College Farm, Bapatla,
Andhra Pradesh during kharif (E1), late kharif (E2) and rabi (E3) 2011- 12 with 21
maize hybrids including check, to study the genotype x environment interaction,
variability, heritability, genetic advance as per cent of mean, character association,
magnitude of direct and indirect effects and standard heterosis. The data was recorded on
plant height (cm), days to 50% tasseling, days to 50% silking, cob length (cm), number
of kernel rows per cob, 100 seed weight (g), biological yield per plant (g), harvest index
(%), stay green nature, protein content (%), tryptophan content (%), lysine content (%),
oil content (%), grain yield per plant (g) and grain yield per hectare (q).
The analysis of variance indicated significant differences among the hybrids for
all characters tested in three environments indicating the existence of variability among
the hybrids.
The genetic variability studies based on PCV and GCV values indicated that the
material used in the present investigation possessed variability. High heritability coupled
with high genetic advance was noticed for the characters, 100 seed weight, protein
content, tryptophan content, lysine content and oil content indicating the predominance
of additive gene action.
The character association and path analysis studies revealed that, 100 seed
weight, cob length, number of kernel rows per cob, biological yield per plant and harvest
index had significant positive association coupled with positive direct effects on grain
yield in all the environments revealing their true relationship. Hence, in the improvement
programmes due importance may be given for these traits to improve genetic yield
potential.
In pooled analysis of variance for stability the hybrids, environments, genotypeenvironment
interaction, environment (linear) and pooled deviations showed significant
differences for most of the characters studied.
According to Eberhart and Russell model, the hybrids, HQPM-7, Bio-9637, Seed
tech, HQPM-1 and Bio-9681 for grain yield; HQPM-1 and Vivek hybrid-23 for 100 seed
weight; Vivek hybrid-9, Vivek hybrid-23 and Manisha for kernel rows per cob; HQPM-7
and Manisha for tryptophan content and HQPM-7, Bio-9681, Kaveri and Manisha for
lysine content showed stable performance over environments.
According to AMMI analysis, the hybrids, Bio-9681, Bio-9637, HQPM-1, CMH
-08-282, Vivek hybrid-9 and Vivek QPM-9 were identified as stable for grain yield.
The study among different stability parameters indicated, similar results of
spotting stable hybrids according to ecovalence, variance due to genotype-environment
interaction of Plaisted and Peterson and b and S2d of Eberhart and Russell.
Heterosis studies revealed that two hybrids, Seed tech and Bio-9681 exhibited
significant positive heterosis for cob length and only one hybrid Bio-9681 for number of
kernel rows per cob and grain yield.
Based on overall performance, the hybrids, Bio-9681, Bio-9637, Vivek hybrid-9
and HQPM-7 are found to be promising for most of the yield and yield contributing
characters.
When compared over different stability models, per se performance, standard
heterosis the hybrids Bio-9681 and Bio-9637 were identified as promising hybrids for
yield. These may be thoroughly tested over large number of environments before they
are being commercially exploited.
 
Date 2016-06-22T11:51:54Z
2016-06-22T11:51:54Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67677
 
Language en
 
Relation D9406;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY