80 research outputs found
Parallel fuel injection from the base of an extended strut into supersonic flow
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76778/1/AIAA-1994-711-873.pd
A genome-wide identification and comparative analysis of the lentil MLO genes
Revista electrĂłnica on linePowdery mildew is a widespread fungal plant disease that can cause significant losses in
many crops. Some MLO genes (Mildew resistance locus O) have proved to confer a durable
resistance to powdery mildew in several species. Resistance granted by the MLO gene family
members has prompted an increasing interest in characterizing these genes and implementing
their use in plant breeding. Lentil (Lens culinaris Medik.) is a widely grown food
legume almost exclusively consumed as dry seed with an average world production of 4.5
million tons. Powdery mildew causes severe losses on certain lentil cultivars under particular
environmental conditions. Data mining of the lentil CDC Redberry draft genome allowed to
identify up to 15 gene sequences with homology to known MLO genes, designated as
LcMLOs. Further characterization of these gene sequences and their deduced protein
sequences demonstrated conformity with key MLO protein characteristics such as the presence
of transmembrane and calmodulin binding domains, as well as that of other conserved
motifs. Phylogenetic and other comparative analyses revealed that LcMLO1 and LcMLO3
are the most likely gene orthologs related to powdery mildew response in other species,
sharing a high similarity with other known resistance genes of dicot species, such as pea
PsMLO1 and Medicago truncatula MtMLO1 and MtMLO3. Sets of primers were designed
as tools to PCR amplify the genomic sequences of LcMLO1 and LcMLO3, also to screen
lentil germplasm in search of resistance mutants. Primers were used to obtain the complete
sequences of these two genes in all of the six wild lentil relatives. Respective to each gene,
all Lens sequences shared a high similarity. Likewise, we used these primers to screen a
working collection of 58 cultivated and 23 wild lentil accessions in search of length polymorphisms
present in these two genes. All these data widen the insights on this gene family and
can be useful for breeding programs in lentil and close related species.S
A review of the phytochemical support for the shifting defence hypothesis
Several theories have been developed to explain why invasive species are very successful and develop into pest species in their new area. The shifting defence hypothesis (SDH) argues that invasive plant species quickly evolve towards new defence levels in the invaded area because they lack their specialist herbivores but are still under attack by local (new) generalist herbivores. The SDH predicts that plants should increase their cheap, toxic defence compounds and lower their expensive digestibility reducing compounds. As a net result resources are saved that can be allocated to growth and reproduction giving these plants a competitive edge over the local plant species. We conducted a literature study to test whether toxic defence compounds in general are increased in the invaded area and if digestibility reducing compounds are lowered. We specifically studied the levels of pyrrolizidine alkaloids, a toxin which is known for its beneficial and detrimental impact against specialists and generalists, respectively. Digestibility reducers did not show a clear trend which might be due to the small number of studies and traits measured. The meta analysis showed that toxic compounds in general and pyrrolizidine alkaloid levels specifically, increased significantly in the invaded area, supporting the predictions of the SDH that a fast evolution takes place in the allocation towards defence
Isolation of Geotrichum candidum pathogenic to tomato (Solanum lycopersicum) in Washington State
Geotrichum candidum was isolated from fruit of tomato (Solanum lycopersicum) in Washington state. Cultural and morphological features, and rDNA sequence data, are reported. Koch's postulates were completed on tomato fruit. This is the first report of this fungus causing disease of tomato in Washington state
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