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VARIABILITY AND GENETIC DIVERGENCE IN ADVANCED GENERATION PROGENIES OF AROMATIC RICE (Oryza sativa L.)

KrishiKosh

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Title VARIABILITY AND GENETIC DIVERGENCE IN ADVANCED GENERATION PROGENIES OF AROMATIC RICE (Oryza sativa L.)
 
Creator LAKSHMI, L
 
Contributor BRAHMESWARA RAO, M. V.
 
Subject grain, yields, planting, genotypes, developmental stages, genetics, rice, biological phenomena, phenotypes, heritability
 
Description In the present investigation, fifty five genotypes of aromatic rice were evaluated
to study the genetic diversity present in the experimental material for selection of the
diverse parents, to estimate the genetic parameters among the genotypes for yield and
quality traits, and the extent of association between the yield and its component
characters including the direct and indirect effects. The experiment was laid out in a
randomized block design with three replications at Rice section farm, Agricultural
Research Institute, Rajendranagar, Hyderabad during kharif 2011.
Analysis of variance indicated the existence of significant genotypic differences
among the genotypes for the yield, its components and grain quality traits for all the
characters. High GCV and PCV values were observed for number of filled grains per
panicle, 1000-grain weight, grain yield per plant, kernel length, L/B ratio, kernel length
after cooking and only high PCV value for number of productive tillers per plant.
High heritability coupled with high genetic advance as percent of mean was
observed for plant height, number of productive tillers per plant, panicle length, number
of filled grains per panicle, 1000-grain weight, grain yield per plant, kernel length, L/B
ratio and kernel length after cooking, which indicated that these traits were controlled
by additive type of gene action. The remaining traits were mostly under the influence of
non additive gene effects as they recorded low to moderate estimates of genetic
advance.
Based on the relative magnitude of D2 values, the genotypes were grouped into
nine clusters. Cluster IV was the largest comprising of eighteen genotypes followed by
cluster II with ten genotypes, cluster I with eight genotypes, cluster III with seven
genotypes, cluster V with six genotypes, cluster VII with three genotypes and cluster
VI, VIII and IX with one genotype each. The highest divergence occurred between
cluster V and cluster IX (43.80) followed by cluster IV and cluster IX (43.15), cluster I
and cluster IV (39.98) and cluster I and cluster V (39.23).
The data on character means for nine clusters indicated that, cluster IX with
only one genotype (Improved pusa basmati) exhibited highest cluster mean for six
traits viz., number of productive tillers per hill, panicle length, kernel length, L/B ratio,
kernel length after cooking and volume expansion ratio. Cluster VII with three
genotypes (RNR-15440, RNR-15507 and RNR-15515) recorded highest mean value
for grain yield per plant and 1000-grain weight. Cluster V possessed highest mean
value for kernel elongation ratio. Cluster IV containing genotypes viz., RNR-15522,
RNR-15523 and RNR-15463 exhibited more number of filled grains per panicle.
The characters kernel length (mm), kernel breadth (mm) and plant height (cm)
contributed maximum (80.87%) towards genetic divergence. The cluster V has the
highest cluster mean for kernel elongation ratio, whereas the cluster IX has the highest
mean value for number of productive tillers per plant, panicle length, kernel length,
L/B ratio, kernel length after cooking and volume expansion ratio. The genotypes of
cluster I possessed long slender grains and genotypes of cluster IV has the highest
mean value for number of filled grains per panicle and lowest in panicle length, kernel
length and kernel length after cooking.
Based on the inter-cluster distances, crossing between the genotypes (RNR-
15452, RNR-15450 and Chittimutyalu) of cluster V and cluster IX (Improved pusa
basmati), cluster IV (RNR-15522, RNR-15523, RNR-15463) and cluster IX (Improved
pusa basmati), cluster I (RNR-15435, RNR-15436) and cluster IV (RNR-15522, RNR-
15523, RNR-15463) or cluster V (RNR-15452, RNR-15450, Chittimutyalu) is
suggested to generate diversified breeding material.
Character association studies revealed that the grain yield per plant showed
positive significant association with panicle length, number of filled grains per panicle,
1000-grain weight, kernel length and L/B ratio at genotypic and phenotypic levels and
number of productive tillers per hill at only phenotypic level. This indicated that a
simultaneous selection for these characters would be more advantageous for yield
improvement in rice.
Critical analysis of the results by path analysis revealed that the traits kernel
length followed by number of filled grains per panicle, 1000-grain weight, number of
productive tillers per hill and plant height were directly influencing the grain yield per
plant. Hence, these traits were considered as important attributes in formulating
selection criterion for achieving desired targets.
 
Date 2016-06-14T10:07:34Z
2016-06-14T10:07:34Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67318
 
Language en
 
Relation D9122;
 
Format application/pdf
 
Publisher ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY