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Keyword: Pinus

Processes underlying restoration of temperate savanna and woodland ecosystems: Emerging themes and challenges

Publications Posted on: November 09, 2020
Open forests of savanna and woodlands span the spectrum between closed canopy forests and treeless grasslands, and therefore contain structure, composition, and function distinctive from either endpoint. In this special issue, researchers provide examples from different open forest ecosystems to examine the underlying ecological principles and specific management challenges affecting successful restoration of these systems.

Is three a crowd? The effect of stand density reduction on drought response

Science Spotlights Posted on: July 13, 2020
Three drought-tolerant tree species – Scots pine, sessile oak, and ponderosa pine – differ somewhat in their response to drought after stand density reductions. In this study, all species grew more each year on average when stand density was low rather than at maximum levels. Lower stand density reduced the drought susceptibility of Scots pine and sessile oak. Ponderosa pine, however, showed greater resistance and resilience to drought under higher, rather than lower, stand densities. Measures that reduce competition between trees are likely to help Scots pine and sessile oak adapt to a potentially drier and warmer climate, but such measures may have muted results compared to the effects of ponderosa pine’s adaptations to historically severely water-stressed conditions.

Implications of reduced stand density on tree growth and drought susceptibility: A study of three species under varying climate

Publications Posted on: June 20, 2020
A higher frequency of increasingly severe droughts highlights the need for short-term measures to adapt existing forests to climate change. The maintenance of reduced stand densities has been proposed as a promising silvicultural tool for mitigating drought stress. However, the relationship between stand density and tree drought susceptibility remains poorly understood, especially across ecological gradients.

Eucalyptus grandis anomaly related to expression of defense genes

Publications Posted on: August 30, 2018
In collaboration with the Suzano Papel and Celulose SA company, we identified an anomaly derived from a full-sib population in a controlled cross between two Eucalyptus grandis individuals. Abnormal seedlings died in a few months and showed significant phenotypic differences (P 0.1), suggesting that the lethality phenotype is controlled by a recessive allele (Tambarussi 2006).

Research on the rust hyperparasite Coregonladosporium tenuissimum: Status and prospects

Publications Posted on: August 30, 2018
The use of biological agents to control plant diseases is an attractive approach, especially at a time when managers and other stakeholders seek to limit the impact of synthetic pesticides. Further, chemical pesticides cannot be used in natural habitats because of their expense and potential negative effects on ecosystems.

Discovery of mycovirus community in the white pine blister rust ecosystems by rust transcriptome profiling

Publications Posted on: August 30, 2018
In North America, the nonnative rust fungus Cronartium ribicola kills immature native five-needle pine trees and indirectly predisposes maturing trees to secondary attack by insects and other fungi, which may result in severe mortality. Since the early 1900s when C.

Cytological analyses reveal variations in nuclear content along the urediniosporic infection cycle of Hemileia vastatrix and other rust fungi

Publications Posted on: August 30, 2018
The recent completion of genome sequencing for some rust fungi has contributed to suggest a link between biotrophic specialization and genome size expansion. The measurement of genome sizes for a selection of rust fungi has revealed some of the largest genomes among fungi, with nine rust species with haploid genomes between 300 and 780 Mbp. In particular, Uromyces appendiculatus, Phakopsora pachyrhizi, U.

The proactive strategy: Preparing the landscape for invasion by accelerating the evolution of resistance

Publications Posted on: August 30, 2018
Restoration of forests devastated by nonnative invaders often dominates the attention of forest managers and their actions. However, taking a broader view of the invasion beyond the crisis areas reveals opportunities where proactive management can alter the outcome of the invasion in threatened areas.

Barcoding the rust fungi of Germany

Publications Posted on: August 30, 2018
The German Barcode of Life (GBOL) project is a large-scale DNA barcoding initiative to assess the biodiversity of animals, fungi, and plants of Germany. Here we introduce the subproject focusing on rust fungi (Pucciniales, Basidiomycota). This is the only group of fungi represented in the initial 3.5-year phase of the project.

Stem rust diseases of Pinus kesiya in Vietnam

Publications Posted on: August 30, 2018
Surveys of two stem rust diseases of Pinus kesiya were implemented in Da Lat, Lam Dong province, in the Central Highlands of Vietnam. Symptoms of the first disease, a gall rust, are very similar to those of Cronartium quercuum in North America.