VARIATION STUDIES IN Melia azedarach Linn.
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Date
2013
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ABSTRACT
The present investigation entitled “Variation studies in Melia azedarach Linn.” was carried out at the experimental field of Department of Tree Improvement and Genetic Resources during 2011-13. Seeds were collected from selected mother tree each at twenty seven locations and progenies were raised to study the extent and pattern of variation with respect to growth and biomass characters. Site S27 (Nauni) exhibited outstanding performance for the growth and biomass characters of progenies followed by S14 (Ropar) and S23 (Subathu), whereas S2 (Palu upper) showed the lowest values for these characters. High heritability with moderate genetic gain was observed for collar diameter followed by root length and root-shoot length ratio among growth and biomass characters while high heritability with moderate genetic gain was recorded for 100-seed weight among seed characters. Highly significant and positive genotypic and highly significant phenotypic correlation was observed for majority of the characters. However, highly significant and positive genotypic and significant phenotypic correlation was observed for root-shoot length ratio and dry root-shoot weight ratio. In case of PCA, 4 out of 17 components had eigen value greater that unity. These four components are retained for further analysis as they contribute 81.73% of total variation. RAPD pattern was studied using 17 primers of which 13 primers showed polymorphism. Ninety seven scorable bands were identified in the range size of 100 bp to 2,000 bp. The dendrogram generated using RAPD markers showed S8 (Bharmar) and S12 (Bharatgarh) as most divergent. Maximum similarity of 92 per cent was observed between S17 (Dhaulakuan) and S18 (Ghagas).