Km. Aradhya et Vd. Phillips, GENETIC-VARIABILITY IN ELITE EUCALYPTUS PROVENANCES AND PROGENIES SELECTED FOR ARID ENVIRONMENTS IN HAWAII, Bioresource technology, 45(2), 1993, pp. 145-150
Citations number
25
Categorie Soggetti
Energy & Fuels","Biothechnology & Applied Migrobiology",Agriculture
The achievement of significantly increased biomass yield per unit area
through genetic improvement of trees is a primary goal of short-rotat
ion intensive-culture (SRIC) of Eucalyptus and other tropical hardwood
s in Hawaii. Twelve entries of Eucalyptus selected for arid environmen
ts in Hawaii were assessed for genetic variation using four isozyme sy
stems involving six loci (Pgi-2, Pgm-1, Pgm-2, Mdh-2, 6Pgd-1, and 6Pgd
-2). They included five open-pollinated (OP) progenies of E. globulus;
three OP progenies of Eucalyptus hybrids (two E. grandis X E. urophyl
la hybrids and one E. grandis X E. camaldulensis hybrid); and four pro
venances (two E. grandis provenances and one provenance each of E. cam
aldulensis and E. saligna). As indicated by mean number of alleles per
locus and observed and expected levels of heterozygosity, the three O
P progenies of hybrids were the most variable, followed by the four pr
ovenances and the three OP progenies of E. 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.