Washington J. Gapare

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The biogeographical relationships between far-separated populations, in particular, those in the mainland and islands, remain unclear for widespread species in eastern Asia where the current distribution of plants was greatly influenced by the Quaternary climate. Deciduous Oriental oak (Quercus variabilis) is one of the most widely distributed species in(More)
Provenance variation and genetic parameters for wood properties of mature radiata pine (Pinus radiata D. Don) were studied by sampling three provenance/progeny trials in southeast Australia. Among the mainland provenances, Monterey and Año Nuevo had higher density and modulus of elasticity (at one site) than Cambria. Basic density and predicted modulus of(More)
The correlation between tree ring width and density and short-term climate fluctuations may be a useful tool for predicting response of wood formation process to long-term climate change. This study examined these correlations for different radiata pine genotypes and aimed at detecting potential genotype by climate interactions. Four data sets comprising(More)
Growth and form traits data were obtained from eight provenance trials of radiata pine (Pinus radiata D. Don) planted across the radiata pine plantation estate in southeast Australia. The genetic pool included 466 open-pollinated families collected from Año Nuevo, Monterey and Cambria provenances on the Californian mainland coast in the USA and from(More)
The Forestry Commission of Zimbabwe initiated a hybrid breeding program of Eucalyptus grandis with E. tereticornis (G × T) and E. camaldulensis (G × C) in order to provide suitable genotypes for planting in areas that are marginal for E. grandis in terms of drought and frost. A total of seven hybrid trials were established at four sites, representative of(More)
Insights into the relative contributions of locus specific and genome-wide effects on population genetic diversity can be gained through separation of their resulting genetic signals. Here we explore patterns of adaptive and neutral genetic diversity in the disjunct natural populations of Pinus radiata (D. Don) from mainland California. A first-generation(More)
Based on analyses using 20 genetically connected radiata pine trials and on the pattern of trial-trial genetic correlations, current regionalisation of breeding in southern Australia seems justified. However, relationships between environmental variables and genotype by environment interaction are complex. Current radiata pine breeding and deployment in(More)
Major challenges exist for applied gene conservation of forest genetic resources in native habitats of the Mexican and Central American Pines, Pinus radiata and the Southern US pines. They include population decline and population structure changes, due to forest removal, conversion of forest land to other uses, fires, climate change, diseases and pests.(More)
Productivity of forest tree plantations can be maximised by matching genetically improved planting stock to environments where it performs best. Radiata pine (Pinus radiata D. Don) breeding and deployment of genetically improved stock in Australia are currently based on the National Plantation Inventory (NPI) regions. These regions are not based on(More)
Cotton bunchy top (CBT) is an aphid transmitted Polerovirus disease and a significant threat to the Australian cotton industry. Symptoms include stunted plant growth, and leaves often display pale green angular patterns at the leaf margins and dark green centers with a leathery texture. Resistance to CBT was evaluated in 206 F2 plants and 76 F2:3 families(More)