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STUDIES ON GENETIC DIVERGENCE IN NEW PLANT TYPE LINES OF RICE (Oryza sativa L.) BASED ON PHYSIOLOGICAL AND YIELD ATTRIBUTES

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Title STUDIES ON GENETIC DIVERGENCE IN NEW PLANT TYPE LINES OF RICE (Oryza sativa L.) BASED ON PHYSIOLOGICAL AND YIELD ATTRIBUTES
 
Creator PURUSHOTHAM, B
 
Contributor SATYANARAYANA, P.V.
 
Subject grain, yields, developmental stages, rice, genotypes, planting, genetics, harvesting, biomass, productivity
RICE (Oryza sativa L.)
 
Description The present investigation was carried out during rabi 2007-08 at Andhra
Pradesh Rice Research Station, Maruteru with 40 New Plant Type genotypes of rice
(Oryza sativa L.) which were developed by APRRI, Maruteru to study mean,
variability, heritability, genetic advance as per cent of mean, correlation, path
coefficient analysis and genetic divergence for the following eleven morphological
characters viz., plant height (cm), days to 50% flowering, productive tillers/hill,
panicle length (cm), fertile grains/panicle, test weight (g), L/B ratio, protein content
(%), leaf nitrogen content at harvest (%), harvest index and grain yield/plant (g) and
three physiological characters viz., leaf area index at the time of days to 50%
flowering, relative growth rate from panicle initiation to maturity and total
biomass/plant.
Analysis of variance indicated that there were significant differences among
the genotypes for all the characters studied except for test weight, L/B ratio and leaf
nitrogen content at harvest.
The characters such as fertile grains/panicle, grain protein, leaf nitrogen at harvest,
leaf area index at days to 50% flowering (DFF), harvest index and grain yield per
plant showed high heritability coupled with high genetic advance as per cent of
mean indicating predominance of additive gene action.
Character association studies revealed positive and significant association of
grain yield per plant with productive tillers per hill, fertile grains per panicle, relative
growth rate at 60-90 days after transplanting, total biomass per plant and harvest
index.
The results of path coefficient analysis revealed that productive tillers/hill,
fertile grains per panicle, relative growth rate at 60-90 days after transplanting, total
biomass per plant and harvest index exhibited high positive direct effect coupled with
positive significant correlation with grain yield per plant.
Results of multivariate analysis and principal component analysis indicated
the presence of considerable genetic divergence among the 40 genotypes that were
studied. Based on the D2 analysis, the genotypes were grouped into six clusters by
Tocher’s method and into seven clusters in cluster analysis proving the fact that there
was no parallelism between genetic diversity and geographical distribution. In D2
analysis protein content contributed maximum towards diversity.
Principal component analysis delivered four principal components which
contributed 93.672 cumulative variance. Population with high PC1 values was
characterized by high loading values of grain protein, leaf area index at days to
50% flowering (DFF) and grain yield per plant. Whereas, population with high
PC2 values was characterized by total biomass per plant, harvest index and days to
50% flowering.
Agglomerative hierarchical clustering by Ward’s minimum variance method
revealed high genetic diversity between cluster I and VII followed by cluster II and
VII and cluster V and VII which could probably give birth to superior progenies.
 
Date 2016-06-07T10:20:04Z
2016-06-07T10:20:04Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/66889
 
Language en
 
Relation D9070;
 
Format application/pdf
 
Publisher ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY