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In 1986, four allopatric Eucalyptus species ( E. camaldulensis Dehnh, E. saligna Smith, E. leucoxylon F. Muell and E. platypus Hook.) were planted together in a 480-mm rainfall zone, in 8-m wide contour belts as part of a plan to minimize waterlogging and secondary salinization. Throughout 1997,...
Many evergreen mahogany ( Swietenia macrophylla King) trees in the seasonally dry Bajo Paragua forest in northeast Bolivia carry substantial liana loads. Evergreen lianas may impede the growth of their host trees in various ways, including competition for water. Hypotheses tested were that water...
Variations in radial patterns of xylem water content and sap flow rate were measured in five laurel forest tree species ( Laurus azorica (Seub.) Franco, Persea indica (L.) Spreng., Myrica faya Ait., Erica arborea L. and Ilex perado Ait. ssp. platyphylla (Webb & Berth.) Tutin) growing in an...
Changes in nutrient availability significantly affect canopy dynamics in conifers. To elucidate these effects, we experimentally fertilized mixed conifer stands at several sites across the northern Rocky Mountains. We measured needle longevity, total branch length and foliated length along the...
Timing of bud burst and frost damage risk for leaves of Betula spp. in response to climatic warming in Finland was examined with two models. In the first model, ontogenetic development in spring was triggered by an accumulation of chilling temperatures. The second model assumed an additional...
Absorption and utilization of photosynthetically active radiation (PAR) were investigated in Scots pine ( Pinus sylvestris L.) and birch ( Betula pendula Roth.) stands that were 41 years old at the end of the experimental period. Canopy depth of the Scots pine stand was about half that of the...
In preliminary experiments on Agrobacterium -mediated transformation of citrus, we found transformation events occurring in callus formed from the cambium. Factors affecting Agrobacterium –sour orange ( Citrus aurantium L.) interactions, such as culture medium, explant source and culture...
Many plants emit isoprene, a hydrocarbon that has important influences on atmospheric chemistry. Pathogens may affect isoprene fluxes, both through damage to plant tissue and by changing the abundance of isoprene-emitting species. Live oaks ( Quercus fusiformis (Small) Sarg. and Q. virginiana...
We investigated physiological responses of radiata pine ( Pinus radiata D. Don) roots to soil strength and soil water deficit by measuring the osmotic potential (Ψ π ) and yield turgor ( Y ) in the elongation zone of root segments of seedlings growing (i) in polyethylene glycol 4000-containing...
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