Genetic variability in elite eucalyptus provenances and progenies selected for arid environments in hawaii
✍ Scribed by K.M. Aradhya; Victor D. Phillips
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 562 KB
- Volume
- 45
- Category
- Article
- ISSN
- 0960-8524
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✦ Synopsis
The achievement of significantly increased biomass yield per unit area through genetic improvement of trees is a prima O" goal of short-rotation intensive-culture (SRIC) of Eucalyptus and other tropical hardwoods in Hawaii. Twelve entries of Eucalyptus selected for arid environments" in Hawaii were assessed for genetic variation using .four isozyme systems involving six loci (Pgi-2, Pgm-1, Pgm-2, Mdh-2, 6Pgd-1, and 6Pgd-2). They included five open-pollinated (OP) progenies orE. globulus; three OP progenies" of Eucalyptus hybrids (two E. grandis X E. urophylla hybrids and one E. grandis X E. camaldulensis hybrid); and four provenances (two E. grandis provenances and one provenance each of E. camaldulensis and E. saligna). As indicated by mean number of alleles per locus and observed and expected levels of heterozygosity, the three OP progenies of hybrids were the most variable, followed by the four provenances and the three OP progenies orE. globulus. The importance of managing genetic variation to avoid deleterious impacts of inbreeding in these elite Eucalyptus selections in a long-term tree improvement program for sustainable commercial SRIC plantations is discussed.