Browsing by Author "GIRIRAJ, K."
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ThesisItem Open Access EVALUATION OF SUNFLOWER (Helianthus annuus L.) GENOTYPES FOR SELF-FERTILITY OVER SEASONS(UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE, 2001-08-07) SUMANGALA, S.; GIRIRAJ, K.A total of 22 sunflower genotypes comprising of 4 hybrids, 17 inbreds and one open pollinated variety were evaluated for self-fertility during rainy season (1999) and summer season (2000) at Main Research Station, University of Agricultural Sciences, Dharwad. The four treatments viz., clothbag (autonomous pollination), clothbag + assisted pollination, clothbag + pollination with bulk pollen of sister lines and open pollination were imposed at the time of flowering. Genotypes were considered as main plots and pollination methods were treated as subplots. These 22 sunflower genotypes were evaluated for 12 characters. All genotypes in general, recorded higher seed yield, number of filled seeds, seed filling percentage, test weight, oil content, kernel percentage, autogamy percentage and self-compatibility during summer season as compared to rainy season. In both seasons hybrids were comparatively more self-compatible than inbreds. The genotypes which had low autogamy per cent recorded higher estimates of self-compatibility. It implied that a genotype which was incompatible will exhibit higher self-compatibility when pollen is made available by way of manual pollination. The genotypes recorded significant increase in seed yield, number of filled seeds, seed filling percentage, oil content, kernel percentage, autogamy percentage and self compatibility under open pollination as compared to other three bagging treatments. For all these characters values were highest under open pollination followed by clothbag with bulk pollen pollination, cloth bag with assisted pollination and the lowest under clothbag. Based on the results of two seasons KBSH-1, MSFH-17 and DSF-255 amongst hybrids and RLC-4, IV-55, NDOL-3, TS-42-2-8, and DSF-2 amongst inbreds were found to be more self-compatible over other genotypes. Importance of evaluating the lines for self-compatibility in sunflower breeding has been discussed.ThesisItem Open Access STABILITY ANALYSIS OF EXPERIMENTAL HYBRIDS FOR SEED YIELD AND ITS COMPONENT CHARACTERS IN SUNFLOWER (Helianthiis animus L.)(UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE, 2001-08-07) KALLENNAVAR, LAXMAN S.; GIRIRAJ, K.The investigation was undertaken to analyse the stability of 15 experimental hybrids and four checks for seed yield and its component characters over three locations, viz., Bheemarayanagudi, Bagalkot and Dharwad during kharif 1998. Stability analysis was carried out by adopting the model of Eberhart and Russell (1966). Two-way analysis of variance revealed significant differences between genotypes and also environments for all the characters except 100 seed weight indicating GxE interactions which was further confirmed by significant variance due to GxE interactions for all the characters. The variance due to genotype x environment (linear) were non-significant for all the characters studied. The mean sum of squares due to pooled deviations were found to be highly significant for all the seven characters, indicating predominance of unpredictable portion of GxE interaction. The overall performance of hybrids over locations revealed that Dharwad location was the most favourable environment for the expression of plant height, head diameter and seed yield, while Bagalkot location was favourable for the expression of characters like 100 seed weight, volume weight and oil content. Bheemarayanagudi location was favourable for the expression of early flowering of genotypes. Taking into consideration the three stability parameters, viz., mean performance over three locations, regression coefficient (hi) and deviation from regression (S2di), the single-cross hybrid VRF-21 was rated as the best for earliness and oil content. PAC-36 ranked first for plant height over three locations. The single-cross hybrid DSH-255 was found to be the best for seed yield and head diameter. The hybrid RSH-1 had maximum 100 seed weight, while MSFH-17 recorded maximum volume-weight. Considering mean performance over three locations, DSH-255 was the most promising hybrid for seed yield and oil content.