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.)
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Creator |
LAKSHMI, L
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Contributor |
BRAHMESWARA RAO, M. V.
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Subject |
grain, yields, planting, genotypes, developmental stages, genetics, rice, biological phenomena, phenotypes, heritability
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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. |
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Date |
2016-06-14T10:07:34Z
2016-06-14T10:07:34Z 2012 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/67318
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Language |
en
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Relation |
D9122;
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Format |
application/pdf
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Publisher |
ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY
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