The isolates differed significantly
on aggressiveness based on pathogenicity assays. rDNA-ITS sequences and phylogenetic analysis confirmed learn more the isolates as Didymella bryoniae. The isolates were found to be highly identical with the exception of 13 isolates, which had a guanine substitution instead of adenine at position 131 of the ITS. “
“Potato plants with symptoms suggestive of potato purple top disease (PPTD) occurred in the central, western and north-western regions of Iran. Polymerase chain reaction (PCR) and nested PCR assays were performed using phytoplasma universal primer pair P1/P7 followed by primer pairs R16F2n/R16R2 and fU5/rU3 for phytoplasma detection. Using primer pairs R16F2n/R16R2 RG7204 concentration and fU5/rU3 in nested PCR, the expected fragments were amplified from 53% of symptomatic potatoes. Restriction fragment length polymorphism (RFLP) analysis using AluI, CfoI, EcoRI, KpnI, HindIII, MseI, RsaI and TaqI restriction enzymes confirmed that different phytoplasma isolates caused PPTD in several Iranian potato-growing areas. Sequences analysis of partial 16S rRNA gene amplified by nested PCR indicated that ‘Candidatus Phytoplasma solani’, ‘Ca. Phytoplasma astris’ and ‘Ca. Phytoplasma trifolii’
are prevalent in potato plants showing PPTD symptoms in the production areas of central, western and north-western regions of Iran, although ‘Ca. Phytoplasma solani’ is more prevalent than other phytoplasmas. This is the first find more report of phytoplasmas related to ‘Ca. Phytoplasma astris’, ‘Ca. Phytoplasma solani’ and ‘Ca. Phytoplasma trifolii’ causing PPTD in Iran. “
“We explored the antifungal activity of thanatin, a 21 amino acid synthetic peptide from the hemipteran spined soldier bug Podisus maculiventris, against the mycotoxin-producing plant pathogenic ascomycete
Fusarium graminearum. In vitro germination assays showed complete inhibition of macroconidia germination and mycelia growth by >10 μm thanatin. Moreover, detached leaves of thanatin-expressing Arabidopsis thaliana plants displayed enhanced resistance towards colonization with F. graminearum. Consistent with this, the plants showed also enhanced resistance of detached leaves to colonization with Botrytis cinerea. The results demonstrate a potential of thanatin for use in plant protection. “
“Three different fungi (isolates IVIA QCV-1, IVIA QCV-3 and IVIA QCV-4) were isolated as potential causal agents of postharvest decay losses observed on sweet persimmons (Diospyros kaki L.) cv. ‘Rojo Brillante’ from commercial packinghouses in the Valencia area (Spain). Disease symptoms were irregular brownish and soft lesions mainly located under and surrounding the fruit calyx (stem-end) that expanded rapidly at room temperature and turned to dark brown or black colour producing apparent and in some cases abundant white to grey mycelium.