Provenance-type Trials ofEucalyptus grandisandE. salignain South Africa: Eight Year Results

Abstract

SYNOPSISA series of five composite trials of Eucalyptus grandis and E. saligna, planted in different areas of South Africa in 1983, was remeasured at the age of 7% years.At all locations E. grandis was superior to E. saligna in height, basal area and volume growth as well as stem form. Because of the higher density of E. saligna, the better seedlots of this species were as good wood mass producers as many of the E. grandis seedlots. The best E. grandis seedlots, however, were far superior to the best E. saligna seedlots.Within each species there were often major changes in the ranking of seedlots for growth variables between the ages of four years and 7% years. There were also indications of moderate genotype X environment interaction for E. grandis. It may therefore be unwise to select superior seedlots at a young age for tree breeding work either within climatic zones or for planting in other zones without testing all seedlots in all climatic zones for at least one-half the expected rotation age.Attempts to determine the best locations for future provenance selections for E. grandis for planting in the eastern Transvaal, South Africa's major E. grandis growing area, indicated that the climatic zones of Australia similar to that found at Coff's Harbour, N.S.W., should be preferred. 30

Genomic evidence of introgression and adaptation in a model subtropical tree species, Eucalyptus grandis

“…What will most likely be the mode of response to niche changes? Do we see evidence of local adaptation as proposed from historic common garden experiments (Arnold et al, 1996;Burgess, 1988;Darrow, 1983;Langat & Kariuki, 2004;Matheson & Mullin, 1987;Skolmen, 1986)? To address these questions, we first need to understand the population structure and genetic diversity in wild E. grandis.…”

“…Eucalyptus grandis serves as a model species for the genus. Although the wealth of common garden data (Arnold, Burgess, & Allender, 1996; Burgess, 1988; Darrow, 1983; Langat & Kariuki, 2004; Matheson & Mullin, 1987; Skolmen, 1986), and genomic (Myburg et al., 2014; Silva‐Junior, Faria, & Grattapaglia, 2015) and transcriptomic (Mangwanda, Myburg, & Naidoo, 2015; Mizrachi, Hefer, Ranik, Joubert, & Myburg, 2010; Oates, Külheim, Myburg, Slippers, & Naidoo, 2015; Vining et al., 2015) resources available for E. grandis stem from its commercial significance (Harwood, 2011), it is also an important foundation species along the east coast of Australia. Its natural range encompasses eight Köppen climate classification zones (Köppen, 1884, 2011) including subtropics in Queensland and temperate areas in New South Wales (http://www.ala.org.au.…”

Monitoring the Chemistry and Monosaccharide Ratio of Eucalyptus Dunnii Wood by near Infrared Spectroscopy

“…Traits such as volume improvement and cold tolerance have been of key concern for tree improvement, 1 the latter particularly so with the shift of growth into temperate areas during the 1980s. [2][3][4][5] Increased pressure from pests and pathogens on local populations can further negatively impact the available supply of forest products, and genetic solutions to address the impact of these are being pursued. 6 Improvements in tissue quality have been lacking in all but the highest priority Eucalyptus species, due to the high cost of analysis, a shortage of rapid-technique instrumentation and a higher focus on problems such as cold and pest/disease tolerance.…”