The nt sequence identities of resultant CP- and polyprotein-encoding sequences against the type isolate of the AO strain were >98.5 and >98.8%, respectively, confirming that all the 17 isolates are of the same genetic group. Estimates of nt diversity showed that the EAPV population in Amami-O-shima had low diversity through the genome and all the genes were under negative selection, but the genetic constraints were varied
between different protein-encoding regions. Phylogenetic analyses revealed that EAPV isolates showed a star-like phyl-ogeny based on their CP-encoding regions, and it is suggested that the population in Sumiyo has expanded recently. “
“Reduced flower pigmentation in the legume Swainsona formosa is associated with increased susceptibility to Phytophthora cinnamomi and other soil-borne
pathogens. U0126 cost This study aimed to identify the mechanism for these differences in susceptibility. Chemical analyses of stem tissues that had been previously inoculated with P. cinnamomi revealed that neither anthocyanin nor total phenolic content increased with infection. Such results suggested that observed differences in susceptibility, as indicated by flower colour, were related to preformed rather than induced stem chemistry. Acetone extracts from healthy, uninfected stem tissues of a red-flowered line were highly toxic to the fungus, while extracts from a white-flowered line were non-toxic and those from a pink-flowered line were intermediate selleck kinase inhibitor in toxicity and this was correlated with the total phenolic and proanthocyanidin concentration of the extracts. Precipitation of proanthocyanidins with bovine serum albumen removed the toxicity of the extracts. It was concluded that differences in the proanthocyanidin content of tissues contributed selleck products to the differences in disease susceptibility of plants with different flower colours. “
“The castor bean cercospora leaf
spot (Cercospora ricinella Sacc. & Berl.) is a common disease in castor bean crop (Ricinus communis L.), causing defoliation and losses. In spite of this, the evaluation of disease severity is an important decision support for adoption of strategies and tactics for disease control. Therefore the objective of this work was to elaborate and to validate a diagrammatic to evaluate cercospora leaf spot severity in the castor bean. The scale was developed based on six treatments with different irrigation depths plus the control treatment without irrigation. Based on disease incidence analysis, it was possible to select different severity levels per treatment, which were used to define the percentage intervals of foliar diseased area of the diagrammatic scale.
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