STUDIES ON GENETIC DIVERGENCE IN NEW PLANT TYPE LINES OF RICE (Oryza sativa L.) BASED ON PHYSIOLOGICAL AND YIELD ATTRIBUTES
KrishiKosh
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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
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Creator |
PURUSHOTHAM, B
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Contributor |
SATYANARAYANA, P.V.
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Subject |
grain, yields, developmental stages, rice, genotypes, planting, genetics, harvesting, biomass, productivity
RICE (Oryza sativa L.) |
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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. |
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Date |
2016-06-07T10:20:04Z
2016-06-07T10:20:04Z 2011 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/66889
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Language |
en
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Relation |
D9070;
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Format |
application/pdf
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Publisher |
ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY
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