0000000000702433
AUTHOR
Christiane Grünewald
Rapid adaptation of signaling networks in the fungal pathogen Magnaporthe oryzae
Abstract Background One fundamental question in biology is how the evolution of eukaryotic signaling networks has taken place. “Loss of function” (lof) mutants from components of the high osmolarity glycerol (HOG) signaling pathway in the filamentous fungus Magnaporthe oryzae are viable, but impaired in osmoregulation. Results After long-term cultivation upon high osmolarity, stable individuals with reestablished osmoregulation capacity arise independently from each of the mutants with inactivated HOG pathway. This phenomenon is extremely reproducible and occurs only in osmosensitive mutants related to the HOG pathway – not in other osmosensitive Magnaporthe mutants. The major compatible so…
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Additional file 7: Figure S6. qPCR results of selected genes. qRT-PCR analysis of putative genes in MoWT, the “lof” mutants ΔMohog1 and ΔMohog1(adapted). The M. oryzae cultures were grown for 96 h in CM at 26 °C and 100 rpm. Each of the cultures was separated into two samples, one mixed with 0.5 M KCl and one untreated control further grown in CM at 26 °C and 100 rpm). Samples were taken after 25 min. The RNA was isolated from the mycelium samples and the results of transcript abundance given relative to quantification in the MoWT untreated control. Three biological replicates were used of each.
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Additional file 4: Figure S3. Mycelium dry weight of the Magnaporthe oryzae wildtype strain, mutants with inactivated components of the HOG signaling cascade and the “adapted” strains after growth in liquid culture upon sorbitol-stress. The fungal colonies were grown in 250 ml complete medium inclusive 1,5 M sorbitol for 6 d at 26 °C and 120 rpm. Error bars represent the standard deviation of three biological replicates of each strain.
MOESM6 of Rapid adaptation of signaling networks in the fungal pathogen Magnaporthe oryzae
Additional file 6: Figure S5. VENN diagram of putative structural variations in promotor [A] and in coding sequences (CDS) [B] within the genome of ΔMohog1, ΔMohog1(adapted) and ΔMopbs2(adapted). Numbers in the intersection regions represent overlapping SNPs among the strains. Numbers in parentheses show the corresponding relative percentage of genes harbouring the SNPs.
The Determination of Carbohydrates by High-Performance Anion-Exchange Chromatography Coupled with Pulsed Amperometric Detection (HPAEC-PAD)
Chromatography techniques are widely used to separate, identify, and quantify molecules depending on their physicochemical properties. Standard methods range from simple size exclusion to separation based on affinity or ion exchange. Here, we present a method for the direct analysis of carbohydrates in Magnaporthe oryzae using high-performance anion-exchange chromatography (HPAEC) coupled with pulsed amperometric detection (PAD). The combination of HPAEC with PAD provides the highest selectivity and sensitivity with minimal sample preparation and cleanup time. Utilizing our HPAEC-PAD approach, we obtain reliable and highly reproducible determination of carbohydrates produced as osmotic stre…