GENETIC VARIABILITY AND CHARACTER ASSOCIATION FOR YIELD AND QUALITY PARAMETERS IN POPULAR RICE HYBRIDS (Oryza sativa L.)
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Date
2009
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ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY RAJENDRANAGAR, HYDERABAD
Abstract
The present investigation was carried out during kharif, 2008 to study the
genetic parameters for yield and yield characters, grain quality characters, character
association and path coefficient analysis in twenty one rice hybrids. The experiment
was laid out at Directorate of Rice Research Farm, ICRISAT Campus, Patancheru,
Hyderabad in a Randomized Block Design with three replications. Data were
recorded on yield, yield attributing characters and grain quality characters.
Analysis of variance indicated the existence of significant differences among
genotypes for all the characters studied except for milling percentage. The characters
viz., number of filled grains per panicle, number of chaffy grains per panicle and Iron
content exhibited high GCV and PCV.
The differences between GCV and PCV were low for all the characters studied
which indicated less influence of environment on these characters. The characters viz.,
number of filled grains per panicle and water uptake by the grain exhibited high
heritability coupled with high genetic advance indicating role of additive gene action
in the inheritance of these traits.
Character association studies revealed significantly positive association of
grain yield per plant with number of productive tillers per plant, whereas characters
such as days to 50 per cent flowering had significant and positive association with
plant height, panicle length and number of filled grains per panicle, plant height
exhibited positive and significant association with number of filled grains per panicle,
number of chaffy grains per panicle and panicle length, while panicle length exhibited
positive significant association with number of filled grains per panicle, number of
chaffy grains per panicle and 1000 grain weight. Therefore, selection for these traits
can improve yield.
Path coefficient analysis revealed that number of productive tillers per plant
has shown high positive direct effect on grain yield. Genetic as well as management
practices will play a pivotal role for the exploitation of higher yields in rice in the
present study. Hence, emphasis can be placed on this character for yield
improvement.
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Keywords
GENETIC, VARIABILITY, CHARACTER, ASSOCIATION, YIELD, QUALITY, PARAMETERS, POPULAR, RICE, HYBRIDS