Keyword: disease resistance

Eucalyptus grandis anomaly related to expression of defense genes

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

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

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

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

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

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

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.

Impact of white pine blister rust on resistant and previously immune cultivated Ribes and neighboring eastern white pine (Pinus strobus) in New Hampshire, USA

White pine blister rust (WPBR; causal agent: Cronartium ribicola) has been a threat to both forest resources and agricultural commodities since its introduction to North America in the early 1900s. Eastern white pine (Pinus strobus) is the most economically important timber species in New Hampshire (USA). From 1917 to 1970 Ribes throughout the State was eradicated to protect the timber industry.

Adaptation of poplar rust to the poplar varietal landscape

The breakdown of host resistance to plant pathogens is of critical concern in agriculture, forestry, and the management of natural systems. Evolution of the fungal poplar rust pathogen Melampsora larici-populina has been shown to have been dramatically influenced by the deployment of resistance genes in commercial poplar (Populus spp.) plantations, with pathogen populations inundated by virulent genotypes (Xhaard et al. 2011).

Efficacy of early pruning to reduce the incidence of white pine blister rust on sugar pine (Pinus lambertiana)

Sugar pine (Pinus lambertiana) is a five-needle pine native to the mixed-conifer forests of the Sierra Nevada and Cascade Ranges of western North America. Sugar pine has great aesthetic, ecological, and economic value and is among the largest of all pines. Like other five-needle pines, sugar pine is susceptible to white pine blister rust (WPBR), caused by the nonnative pathogen Cronartium ribicola.