Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/70277
Authors: VINAY KUMAR, G
Advisor: SUDHEER KUMAR, S
Title: EVALUATION OF NEW INBRED LINES FOR AUTOGAMY, SEED YIELD AND YIELD COMPONENTS IN SUNFLOWER (Helianthus annuus L.)
Publisher: ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD
Language: en
Type: Thesis
Series/Report no.: D8311;
Agrotags: INBRED, LINES, AUTOGAMY, SEED, YIELD, COMPONENTS, SUNFLOWER
Abstract: The present investigation was taken up with the primary objective of evaluating 63 sunflower genotypes including 60 inbred lines and three checks for autogamy, genetic variability, character association, path analysis and genetic diversity for seed yield and yield components. Autogamy studies revealed that hybrids recorded high per se autogamy and geitonogamy (90.73 %, 89.55 %) followed by inbreds (82.17%, 80.62 %) and the inbred lines PK-104 (94.02%), NDR-8 (92.23 %), RHA-274 (92.06 %), R-17 (91.34 %) and PET-2-89-1B (90.98 %) showed high rate of autogamy. The analysis of variance revealed that the significant variability was present in the genotypes. The variability and genetic advance as per cent of mean was higher for number of filled seeds per head, seed yield per plant, number of unfilled seeds per head, test weight and plant height. While, high heritability coupled with high genetic advance as per cent of mean was noticed for characters viz., seed yield per plant, number of filled seeds per head, test weight and plant height suggesting the presence of additive gene action controlling these traits. The study of character association revealed that the characters viz., number of filled seeds per plant, test weight, head diameter, plant height, number of unfilled seeds per plant, days to maturity, days to 50 per cent flowering, number of leaves per plant and oil content have recorded positive correlation with seed yield. Path analysis revealed the presence of higher magnitude of positive direct effects of number of filled seeds per head, test weight and oil content on seed yield, while, head diameter, days to maturity, plant height and number of unfilled seeds per plant, showed negative direct effect on seed yield. Multivariate analysis grouped 63 genotypes into eight clusters and the magnitude of D2 values indicated the presence of substantial variability in these clusters. The pattern of distribution of genotypes into various clusters revealed that there was no relationship between geographical distribution and genetic diversity. Greater genetic divergence was found between cluster II and VII and II and VI, thus suggesting that the genotypes of these clusters may be exploited to explore the fullest range of variability for the character(s) and to release good recombinant lines. From the present investigations, it can be concluded that the maximum inter cluster distance was observed between cluster II and VII. Higher autogamy estimates that inbreds, NDR-8 (92.23 %), RHA-274 (92.06 %), R-17 (91.34 %) and PET-2-89-1B (90.98 %). The genotypes from these clusters may be used as potential donors for future hybridization programmes to develop potential recombinants with high yield coupled with desirable oil quality. The checks KBSH-1 (80.48 %), KBSH-44 (88.62 %) and DRSF-108 (72.75 %) from cluster II, inbreds NDR-8 (92.23 %) and RHA-274 (92.06 %) from cluster VII, R- 17 (91.34 %) from cluster VI and PET-2-89-1B (90.96 %) from cluster VIII possessed higher autogamy. These inbreds are may be used in future breeding programmes to develop highly self fertile varieties and hybrids
Issue Date: 2008
Appears in Collections:Theses

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