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GENETIC ANALYSIS FOR YIELD AND YIELD COMPONENTS INVOLVING CMS SOURCES AND FERTILITY RESTORATION OVER ENVIRONMENTS IN RICE (Oryza sativa L.)

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Title GENETIC ANALYSIS FOR YIELD AND YIELD COMPONENTS INVOLVING CMS SOURCES AND FERTILITY RESTORATION OVER ENVIRONMENTS IN RICE (Oryza sativa L.)
 
Creator PATIL, AJEET B.
 
Contributor MEHTA, H.D.
 
Subject hybrids, yields, grain, environment, heterosis, planting, animal husbandry, crossing over, genotypes, developmental stages
 
Description In the present investigation, information regarding identification of
effective restorer identified for new CMS lines, magnitude of heterosis, estimates
of combining ability, nature of gene action, G x E interactions and stability
parameters was gathered for grain yield plant-1 (g) and thirteen other traits using
line x tester analysis involving four females, twenty three males and their
resultant ninety two crosses and two checks evaluated at three locations during
kharif-2012.
Among 34 high yielding varieties/ promising lines, 28 genotypes were
identified as common restorers with all the three CMS lines. Aditya was identified as
effective maintainer for IR-58025A CMS lines showing that absence of restoring
gene (s) for restorations of fertility for this male sterile cytoplasmic sources.
Significant differences were noticed among genotypes, parents and
hybrids for all the characters studied. Significance of parents vs. hybrids
comparison showed existence of overall heterosis. Significance of parents x
locations and hybrids x locations interactions suggested that parents and hybrids
interacted differently with different environments. A considerable degree of
heterosis in desired direction was manifested by many hybrids over better parent
and standard checks viz., GNR-3 and PA-6201 in respect of grain yield plant-1 (g)
and various component traits. Significant positive heterotic effects and high per
se performance with regards to grain yield plant-1 (g) were recorded by the
hybrids, IR-58025A x NAUR-1, IR-68888A x NAUR-1 and
IR-58025A x IET-18654. Total forty two, nine and five hybrids exhibited
significant positive heterosis over better parent, GNR-3 (SC-I) and PA-6201 (SCII)
for grain yield plant-1.
High yielding hybrids, IR-58025A x NAUR-1,
IR-68888A x NAUR-1 and IR-58025A x IET-18654 also exhibited significant
positive sca effect for grain yield plant-1 (g).
Combining ability analysis revealed importance of both additive and
non-additive genetic components for most of the traits. However, relatively high
magnitude of sca variances for the traits viz., productive tillers plant-1, plant
height (cm), grains panicle-1, grain yield plant-1 (g), straw yield plant-1 (g), harvest
index (%), kernel L:B ratio, 1000-grain weight (g), protein content (%) and
amylose content (%) indicated preponderance of non-additive components of
genetic variance.
The sca variances were found to be influenced by the environmental
fluctuations for most of the traits whereas gca variances were influenced by the
environmental changes in few of the traits as evident from differences in ratio of gca/
sca to gca x locations / sca x locations.
Among females, IR-58025B and among males, NAUR-1,
IET-18654, PD-10, PD-12, PD-19 and IR-65483-14-1-4-1-3 exhibited high gca
effects for grain yield plant-1 (g) and were observed as good general combiners
for yield and most of its contributing characters and these may be utilized in
further breeding programme.
The crosses with high sca effects were in general combinations of
parents with good x good and good x poor or good x average gca effects. The
frequency of good x good was observed more. This was represented in best three
hybrids for grain yield plant-1 (g) viz., IR-58025A x NAUR-1 (good x good),
IR-68888A x NAUR-1 (poor x good) and IR-58025A x IET-18654 (good x good)
had significant desired sca effects and significant desired heterotic response over
better parent as well as both standard checks. Among top 10 hybrids, five hybrids
viz., IR-58025A x NAUR-1, IR-68888A x NAUR-1, IR-58025A x IET-18654,
IR-58025A x IR-65912-90-1-6-3-2 and IR-68888A x IET-18654 exhibited one of
their parents found to be good combiners.
The analysis of variance of phenotypic stability indicated significant
G x E interaction for all the traits when tested against pooled error except kernel L:B
ratio and protein content (%). The G x E interaction (linear) component was
significant for all the traits when tested against pooled error.Pooled deviation was
significant for all the characters except days to 50 % flowering, productive tiller
plant-1, pollen fertility (%), spikelet fertility (%), kernel L: B ratio and protein
content (%) when tested against pooled error suggesting importance of both linear
and nonlinear components in building up total G x E interaction.
The best three high yielding and stable hybrids over environments for
grain yield plant-1, were IR-58025A x NAUR-1, IR-68888A x NAUR-1 and
IR-58025A x IET-18654 was found to be most stable for productive tillers plant-1,
panicle length (cm), grains panicle-1, grain yield plant-1 (g), pollen fertility (%) and
spikelet fertility (%).
On the basis of per se performance, heterotic response, combining
ability estimates, nature of gene action and stability parameters for grain yield
plant-1 (g) and yield attributing traits, cross combination, IR-58025A x NAUR-1
was found to be the most promising and may be exploited commercially after
rigorous evaluation.
 
Date 2016-05-04T10:55:17Z
2016-05-04T10:55:17Z
2014-03
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/65775
 
Language en
 
Format application/pdf
 
Publisher Navsari Agricultural University, Navsari