Advanced backcross families derived from Oryza sativa cv MR219/O. rufipogon IRGC105491 were utilized for identification of quantitative trait loci (QTL) for blast resistance using simple sequence repeat markers. Two hundred and sixty-one BC(2)F(3) families were used to construct a linkage map, using 87 markers, which covered 2375.2 cM of 12 rice chromosomes, with a mean density of 27.3 cM. The ...

Bursaphelenchus xylophilus isolate MPSy-1av was subcultured from pathotype MPSy-1. MPSy-1av is nonparasitic and does not establish in Pinus sylvestris, P. strobus, P. nigra, or P. taeda. This isolate produces ethanol as an end product of carbohydrate metabolism, whereas its parent pathotype, MPSy-1, does not. Alcohol dehydrogenase activity was easily detectable in homogenates of MPSy-1av but ba...

Abstract Background Verticillium dahliae Kleb. is a soil-borne pathogen with broad host spectrum and causes yield losses in cotton cultivation worldwide. Beauveria bassiana an environmentally friendly entomopathogenic fungus (EPF) that has been recognized, used studied for many years. Results As control, all local of B. isolates inhibited mycelial growth the at different rates. The highest perc...

Alternaria brown spot disease is caused by the alternata tangerine pathotype, which relies on ACT-toxin for infection. At present, all identified biosynthesis-related genes are multi-copy genes. In this study, we summarized advances in important host-specific toxins (HSTs), and listed key required pathogenicity of A. pathotype. Toxin virulence test results revealed that different citrus species...

spot blotch caused by bipolaris sorokiniana is a serious disease of barley in western canada. it has become the predominant barley leaf spot disease in the province of manitoba, canada, since 2001. a new pathotype of b. sorokiniana with virulence on seedlings of ‘resistant’ six-rowed barley cultivars grown in manitoba was recently identified. to determine the adult plant infection response of b...

Turnip mosaic virus (TuMV), a species of the genus Potyvirus, occurs worldwide. Seventy-six isolates of TuMV were collected from around the world, mostly from Brassica and Raphanus crops, but also from several non-brassica species. Host tests grouped the isolates into one or other of two pathotypes; Brassica (B) and Brassica-Raphanus (BR). The nucleotide sequences of the first protein (P1) and ...

in iran, common bunt of wheat is one of the most important diseases of wheat and using resistant varieties is the best strategy against it. in order to find resistance sources against the disease for effective breeding programs, determining races of the pathogen is critical. in this study, spikes infected with common bunt of wheat were collected from different farms of khuzestan province in 200...

Among 120 simple sequence repeat (SSR) markers, 23 polymorphic markers were used to identify the segregation ratio in 320 individuals of an F(2) rice population derived from Pongsu Seribu 2, a resistant variety, and Mahsuri, a susceptible rice cultivar. For phenotypic study, the most virulent blast (Magnaporthe oryzae) pathotype, P7.2, was used in screening of F(2) population in order to unders...

Escherichia coli O103, harbored in the hindgut and shed in the feces of cattle, can be enterohemorrhagic (EHEC), enteropathogenic (EPEC), or putative non-pathotype. The genetic diversity particularly that of virulence gene profiles within O103 serogroup is likely to be broad, considering the wide range in severity of illness. However, virulence descriptions of the E. coli O103 strains isolated ...