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Variation in Specific Gravity of Wood in Segregating F2 and F3 Populations of E. Citriodora Hook. X E. Torelliana F.V. Muell. Hybrids
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The present paper reports the variations observed in specific gravity of wood in segregating populations of F2 and F3 hybrids of E. citriodora and E. torelliana. Perhaps this is the first report of its kind so far as the F2 and F3 hybrids of Eucalyptus are concerned. These studies were carried out on lO-year-old plants growing in a field trial laid out in 1987 at New Forest Campus, Dehradun. (Alt. 640m. Lat. 30° 30° 40° N.R.F. 216 cm.). A comparison in specific gravity of wood has been made with parent species involved in hybridization. A subtle range in variation in specific gravity of wood was observed due to segregation. The range in specific gravity of wood observed was 0.8144 - 0.8931 in E. citriodora, 0.6279 - 0.6590 in E. torelliana and 0.5170 - 0.6677 for F2 and F4 recombinants. Since a wide spectrum of variation has been observed in individual tree specific gravity of wood belonging to F2 and F3 generation hybrids this has offered ample scope for selection of desired recombinants for different end uses.
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