GENETIC DIVERGENCE AND CHARACTER ASSOCIATION IN SAFFLOWER (Carthamus tinctorius L.)
KrishiKosh
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Title |
GENETIC DIVERGENCE AND CHARACTER ASSOCIATION IN SAFFLOWER (Carthamus tinctorius L.)
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Creator |
VENKATA GOPINATH, V
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Contributor |
SREEDHAR, N
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Subject |
GENETIC, DIVERGENCE, CHARACTER, ASSOCIATION, SAFFLOWER
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Description |
A study of nature and degree of genetic variability present in the exotic germplasm accessions is essential. Based on the variability and extent of diversity present in the population, a breeder may be able to select desirable parents for evolving superior varieties and heterotic recombinants. Most of the exotic germplasm which have adopted biotic and abiotic characteristic features remains untapped. Hence, a concerted effort is needed to tap the beneficial genes through conventional hybridisation techniques. The present experiment consisting of thirty six exotic germplasm accessions and four improved check varieties were laid out in a Randomised Block Design replicated thrice at College Farm, College of Agriculture, Rajendranagar. The data was recorded for ten morphological characters and quantitative characters. Morphological characterisation was carried out by using descriptor guidelines developed by IPGRI. Considerable amount of variability was observed for all morphological characters except for seed shape. A analysis of variance indicated significant differences among the genotypes for all the characters studied indicating wide variability in the experimental material. High estimates of phenotypic and genotypic coefficients of variations for oil yield per plant and seed yield indicated adequate variability for these characters among the genotypes studied while low variability estimates were observed for days to 50 per cent flowering and oil content. The extent of genetic divergence between genotypes in the experimental material was assessed by Mahalanobis D2 analysis. The clustering analysis had partitioned the 40 genotypes into seven clusters based on their D values. The pattern of distribution of genotypes in various clusters revealed no relationship between geographical distribution and genetic diversity. Maximum genetic divergence was found between cluster IV and cluster V, suggesting that the genotypes in these clusters could be fully exploited by intermating them in a definite design to explore the wide range of heterosis and to release good recombinant lines. Hull content had contributed maximum towards genetic divergence while, days to 50 per cent flowering did not contribute anything. Correlation studies revealed significant positive association of hull content, number of seeds in main capitulum and diameter of main capitulum with seed yield. Days to 50 per cent flowering exhibited negative association with seed yield which suggested that it could be considered for selection for improvement in seed yield. Path analysis revealed that hulling percentage and number of seeds in main capitulum had the maximum direct effect on seed yield followed by number of effective capitula per plant and 100 seed weight. All the ten quantitative characters exhibited positive direct effect towards seed yield suggesting that emphasis could be laid on them to bring about an improvement in seed yield. |
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Date |
2016-08-22T13:23:32Z
2016-08-22T13:23:32Z 2003 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/73284
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Language |
en
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Relation |
D6965;
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Format |
application/pdf
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Publisher |
ACHARYA N.G. AGRICULTURAL UNIVERSITY RAJENDRA NAGAR, HYDERABAD - 500 03 0
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