Thumbnail Image

Theses

Browse

20122
Reset filters
Subject: Genetics and Plant Breeding × End date: 2012 × Start date: 2012 × Thesis Type: M.Sc ×
Reset filters

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    ThesisItemOpen Access
    PROVENANCE STUDIES IN Albizia lebbek Benth.
    (2012) GANGADHARRAO, DHUPPE SUKESH; THAKUR, I.K.
    ABSTRACT The present investigation entitled “Provenance studies in Albizia lebbek Benth.” was carried out at the research field, Department of Tree Improvement and Genetic Resources, Dr. Y S Parmar University of Horticulture and Forestry, Nauni, Solan (HP) during 2011-12 to evaluate fifteen provenances of Albizia lebbek from Himachal Pradesh. The experiment was laid out in a RBD with three replications. Provenances were evaluated for some phenotypic characters of plus trees, seeds and seedlings and their fodder quality traits. Analysis of variance showed significant differences for all the characters under study. In this study highest mean values for 100 seed weight, seed length and seed width were recorded in P6 (Jachh) provenance and seed germination percentage in P9 (Mubarakpur). Maximum values for biomass traits were found in P11 (Dhaulakuan), P7 (Khatiyad) and P5 (Dehari). Similarly P5 (Dehari), P9 (Mubarakpur) and P12 (Shambuwala) provenances were found superior for fodder quality traits. High heritability coupled with high genetic gain estimates were recorded in characters viz. germination (%), survival (%), seedling height (cm), collar diameter (cm), no of leaves, shoot fresh weight (g), shoot dry weight (g), root fresh weight (g) and root dry weight (g). The shoot dry weight showed highly significant positive genotypic as well as phenotypic association with seedling height, collar diameter, shoot fresh weight, root fresh weight and root dry weight which suggests that shoot dry weight can be improved through selection for these traits. Furthermore divergence studies indicated that hybridization between provenances from cluster III and IV can be utilized for getting the superior recombinants in segregating generations.
  • Thumbnail Image
    ThesisItemOpen Access
    VARIATION STUDIES IN Ulmus villosa BRANDIS
    (2012) THAKUR, SAPNA; THAKUR, I.K.
    ABSTRACT The present investigation entitled “Variation studies in Ulmus villosa Brandis” was carried out at the experimental field of Department of Tree Improvement and Genetic Resources during 2010- 12. Seeds were collected from five mother trees each at six seed sources and progenies were raised to study the extent and pattern of variation with respect to growth and biomass characters. However, the wood samples were collected from selected trees for studying wood characters. Site S4 (Jagoti) exhibited outstanding performance for the growth and biomass characters of progenies followed by S1 (Jadh) and S5 (Katouch), whereas S3 (Jhidi) showed the lowest values for these characters. Site S6 (Andhra) trees exhibited outstanding performance for wood characters followed by S4 (Jagoti) trees. High heritability with moderate genetic gain was observed for collar diameter followed by plant height and petiole length among growth and biomass characters and high heritability with moderate genetic gain was recorded in wood density among wood characters. Highly significant and positive genotypic and significant phenotypic correlation were observed for height and diameter, fresh shoot weight and fresh root weight and dry shoot weight and dry root weight. RAPD pattern was studied using 10 primers all of which showed amplification. Fifty seven scorable bands were identified in the range size of 147.10 bp-2901.97 bp. The dendrogram generated using RAPD markers showed Jugahan-T3 as most divergent. Maximum similarity of 70 percent was observed between Jagoti-T3 and Jagoti-T2.