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FERTILITY RESTORATION STUDIES AND GENETIC ANALYSIS FOR YIELD AND ITS COMPONENT TRAITS USING DIFFERENT MALE STERILE CYTOPLASMIC SOURCES IN RICE (Oryza sativa L.)

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Title FERTILITY RESTORATION STUDIES AND GENETIC ANALYSIS FOR YIELD AND ITS COMPONENT TRAITS USING DIFFERENT MALE STERILE CYTOPLASMIC SOURCES IN RICE (Oryza sativa L.)
 
Creator WAGHMODE, BHARAT D.
 
Contributor MEHTA, H.D.
 
Subject hybrids, yields, heterosis, rice, environment, developmental stages, grain, crossing over, planting, animal husbandry
 
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 were gathered for grain yield plant-1 and sixteen other yield attributing
traits using line x tester analysis involving five females, fifty five genotypes their
resultant two hundred seventy five crosses and three checks evaluated at three
locations during kharif-2008.
Among 55 high yielding varieties/ promising lines, 47 genotypes
exhibited fertility restoration with any one of the CMS line. Out of 47 genotypes, 14
varieties (29.79%) were identified as common restorers with all the five CMS lines
of five different sources. VDN-9-10-1 identified as effective maintainer for all the
five CMS lines showing that absence of restoring gene (s) for restorations of fertility
for all five 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 three standard checks viz., Jaya, Sahyadri and GR-11 in respect of grain yield
plant-1 and various component traits. Significant positive heterotic effects and
high per se performance with regards to grain yield plant-1 were recorded by the
hybrids, RTN-3A X BL-184AR, RTN-2A X NVSR-20 and RTN-13A X GR-7.
Total fifteen hybrids exhibited significant positive heterosis over standard check
released hybrid, Sahyadri for grain yield plant-1.
High yielding hybrids, RTN-3A X BL-184AR, RTN-2A X NVSR-
20 and RTN-13A X GR-7 also exhibited significant positive sca effect for grain
yield plant-1 and some of its component traits like productive tillers plant-1,
number of filled panicle-1, spikelet fertility, L:B ratio, straw yield plant-1 and
harvest index. The highest sca effects in desired direction for number of filled
spikelets panicle-1 was exhibited by cross RTN-3A X BL-184AR.
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 all the traits except productive tillers plant-1
indicated preponderance of non-additive components of genetic variance.
The sca variances was found to be influenced by the environmental
fluctuations for most of the traits while as gca variances influenced by the
environmental changes in few of the traits as evident from difference in ratio of
gca/ sca to gca x locations / sca x locations.
Correlation studies indicated the comparison of mean performance
of hybrids and their sca effects showed higher performance of crosses was
associated with their sca effects for all most all the characters while higher
performance of parents associated with their gca effects observed only for the
traits viz., productive tillers plant-1, panicle length, number of filled spikelets
panicle-1, pollen fertility, spikelet fertility, milling, head rice recovery, 1000-grain
weight and L:B ratio.
Among females, RTN-3B and RTN-2B and among males, IR-63879-
195-195-2-2-3-2, NVSR-20, BL-184AR, GR-7 and IR-8866 exhibited high gca
effects for grain yield plant-1 and were observed as good general combiner 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 viz., RTN-3A X BL-184AR (good x good), RTN-2A X
NVSR-20 (good x good) and RTN-13A X GR-7 (poor 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., RTN-3A X BL-184AR,
RTN-2A X NVSR-20, RTN-3A X NVSR-20, RTN-3A X RDN-97-3-2-37-14 and RTN-2A X
IR-8866 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 head rice
recovery (%), 1000-grain weight (g), kernel length, kernel L:B ratio, protein content
(%) and amylose content (%). The G x E interaction (linear) component was
significant for all the traits when tested against pooled error except 1000-grain
weight (g), kernel length (mm), kernel L:B ratio, protein content (%) and amylose
content (%). Pooled deviation was significant for all the characters except kernel
length (mm), kernel L: B ratio, 1000-grain weight (g), head rice recovery (%),
amylose content (%) 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 RTN-3A X BL-184AR, RTN-2A X NVSR-20 and RTN-13A X GR-
7. The hybrid, RTN-3A X BL-184AR was found to be most stable for days to 50 %
flowering, plant height (cm), grain yield plant-1 (g), straw yield plant-1 (g), harvest
index (%), pollen fertility (%), spikelet fertility (%), kernel L : B ratio, and amylose
content (%).
On the basis of per se performance, heterotic response, combining
ability estimates, nature of gene action and stability parameters for grain yield
plant-1 and yield attributing traits, cross combination, RTN-3A X BL-184AR was
found to be the most promising and may be exploited commercially after rigorous
evaluation.
 
Date 2016-03-19T11:15:30Z
2016-03-19T11:15:30Z
2010-01
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/65302
 
Language en
 
Format application/pdf
 
Publisher Navsari Agricultural University, Navsari