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Thesis

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1989 - 198911990 - 199919
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Subject: Genetics and Plant Breeding × End date: 1999 × Start date: 1980 × Type: Thesis × Thesis Type: Ph.D ×
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Now showing 1 - 9 of 20
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    ThesisItemOpen Access
    GENETIC INVESTIGATIONS, CHARACTERISATION AND FIBRE COLOUR DEVELOPMENT STUDIES IN NATURALLY COLOURED COTTONS (Gossypium spp.)
    (University of Agricultural Sciences, Dharwad, 1999) SHIRSAT, SIDHARTHKUMAR; KHADI, B M
    Significant genetic variation, moderate to heigh heritability and genetic advance were observed in 22 genotypes and 10 hybrids. Some of the brown linted G. birsutum and G. arboreum genotypes were high performing and could be used directly for commercial cultivation whereas green linted genotypes were poor in performance. No colour cotton genotype was having long, extra long staple length and all genotypes were very poor in fibre strength. The per se performance of colour cotton hybrids was better than their colour linted parents. Some of the colour cotton hybrids were on par with DHH-11 and NHH-44. Similar trend was observed for heterosis. When only colour and white classes were considered it was observed that fibre colour was incompletely dominant and governed by single gene in G. hirsutum and by two-gene interaction (dominant epistasis) in G. arboreum and colour class could be divided into six overlapping classes indicating presence of continuous variation. In colour cotton genotypes significant positive association of seed cotton yield (SCY) and lint yield (LY) was observed with all growth parameters, except for seed index (SI) and boll weight (BW). In hybrids, indirect relation between SCY, LY, LI, GOT and BW and SI made correlations very complex. The fibre fineness was most important fibre quality parameter as it had significant negative relation witli all otlier characters. Its importance was confirmed by path analysis of fibre length. In colour cotton genotypes BW, SI, GOT, LI and in hybrids BW, number of bolls (NB) and GOT were important contributors to seed cotton yield. Lint yield path analysis indicated the importance of SCY, LI, SI in colour cotton genotypes and SCY, LI and BW in hybrids. Path analysis for fibre quality index (FQl) indicated that fibre length, fibre fineness and fibre strength were most important and for counts strength product (CSP) FQl was found most important. Six generation analysis revealed that gene effects like dominance and interaction (DS-28 X DGH-95, DS-28 X DBH95), additive, dominance and additive X dominance (DBH95 X DGH95), additive and interaction (Abadhita X DGH95), additive and dominance X dominance (DBA95 X A-82-1-1) were predominant. The EMS treatments of 0.2 and 0.3 percent were best for G. arboreum and G. hirsutum respectively as they could yield high number of desirable mutants and high variation for yield fibre quality and fibre colour shades. The number of days required for development of colour in fibre varies with genotypes and species. It was 33-37 days after pollination (DAP) in G. hirsutum green, 35-38 DAP in G. hirsutum brown cotton, and 48-51 DAP in G. arboreum brown cotton. It was possible to characterize electrophoretically G. arboreum colour cotton from white ones as it had only one band as compared to three bands in white listed genotypes. In case of G. hirsutum colour and white linted genotypes, characterization was difficult as both had two bands nearly at same Rm distance. The actual pigments responsible for fibre colour in G. hirsutum and G. arboreum were different but pigments belonged to general class of flavonoids.
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    ThesisItemOpen Access
    STUDIES ON GENETIC DIVERGENCE IN TAMARIND (Tamarindus indica L.) ACROSS PROVENANCES OF SOUTHERN KARNATAKA
    (University of Agricultural Sciences GKVK, Bangalore, 1993) Ganga Prasad, S; Kulkarni, R S
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    GENOTYPE ENVIRONMENT INTERACTION IN RICE (Oryza sativa L.) WITH SPECIAL REFERENCE TO COLD TOLERANCE
    (University of Agricultural Sciences GKVK, Bangalore, 1992) Shanthakumar, G; Veerappa, K B
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    RESISTANCE MECHANISM OF Lycopersicon SPECIES TO THE VECTOR Bemisia tabaci AND ULTRASTRUCTURAL CHANGES IN LEAF CURL VIRUS INFECTED TOMATO PLANTS
    (University of Agricultural Sciences GKVK, Bangalore, 1989) Channarayappa; Shivashankar, G
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    INDUCED MUTAGENESIS FOR ENHANCED YIELD AND NITROGEN FIXING ABILITY IN COWPEA [Vigna unguiculata (L.) Walp.]
    (University of Agricultural Science, Dharwad, 1998) Mahadevu, P; Kulkarni, R S
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    STUDIES ON HETEROSIS AND ENVIRONMENTAL SENSITIVE GENIC MALE STERILITY IN RICE (Oryza sativa L.)
    (University of Agricultural Science, Dharwad, 1996) Hemareddy, H B; Mahadevappa, M
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    ANALYSIS OF THREE-WAY AND SINGLE CROSS HYBRIDS FOR STABILITY AND SEED PRODUCTION POTENTIALITY IN SUNFLOWER (Helianthus annuus L.)
    (University of Agricultural Science, Dharwad, 1998) Halaswamy, B H; Virupakshappa, K
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    GENETICS OF YIELD, YIELD ATTRIBUTES AND CAPSAICIN CONTENT IN CHILLIES (Capsicum annuum L.)
    (University of Agricultural Science, Dharwad, 1997) Patil, Bhuvaneshwara Gowda R; Kulkarni, R S
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    GENETICS OF BLAST RESISTANCE AND BIOCHEMICAL COMPOUNDS ASSOCIATED WITH DISEASE RESISTANCE IN FINGER MILLET (Eleusine coracana G.)
    (University of Agricultural Science, Dharwad, 1997) Byre Gowda, M; Shankare Gowda, B M
    ABSTRACT NOT AVAILABLE