genetic mapping of the pear scab resistance gene vnk of japanese pear cultivar kinchaku.pear scab (caused by venturia nashicola) is one of the most harmful diseases of pears, especially japanese and chinese pear species. the molecular identification and early selection of resistant plants could greatly improve pear breeding. we have identified the position of the scab resistance gene, designated vnk in an indigenous japanese pear cultivar kinchaku, within the pear genome by using simple sequence repeat (ssr) markers derived from pear and apple. the position of vnk was identified in ...200616838137
ultrastructural study on acibenzolar-s-methyl-induced scab resistance in epidermal pectin layers of japanese pear leaves.the infection behavior of japanese pear scab pathogen venturia nashicola race 1 was studied ultrastructurally in acibenzolar-s-methyl (asm)-pretreated susceptible japanese pear (cv. kousui) leaves to determine the mechanism of asm-induced scab resistance. on asm-pretreated leaf surfaces, the infection behavior (conidial germination and appressorial formation) was similar to that on distilled water (dw)-pretreated leaves prior to cuticle penetration by the pathogen. however, after penetration, di ...200818943227
acibenzolar-s-methyl-induced resistance to japanese pear scab is associated with potentiation of multiple defense responses.abstract this study reports the mode of action of acibenzolar-s-methyl (asm) against japanese pear scab, caused by venturia nashicola. pretreatment of potted japanese pear trees with asm reduced scab symptoms and potentiated several lines of plant defense response. this included transcripts encoding polygalacturonase-inhibiting protein (pgip) that were highly and transiently promoted after scab inoculation of plants pretreated with asm, suggesting a possible role for defenses involved in direct ...200418943485
infection behavior of venturia nashicola, the cause of scab on asian pears.abstract the infection of japanese pear by venturia nashicola, the cause of scab on asian pears (japanese pear, pyrus pylifolia var. culta; chinese pear, p. ussuriensis), was examined using light and electron microscopy to determine the mechanism of resistance in pears. early stages of infection were similar on the susceptible cv. kosui, the resistant cv. kinchaku, and the nonhost european pear (p. communis) cv. flemish beauty. v. nashicola penetrated only the cuticle layer on pear leaves and fo ...200018944422
specific polymerase chain reaction identification of venturia nashicola using internally transcribed spacer region in the ribosomal dna.abstract a technique based on the polymerase chain reaction (pcr) was developed for the identification of venturia nashicola using nucleotide sequence information of the ribosomal dna region. the complete internal transcribed spacer (its) region of v. nashicola strains and phylo-genetically related species was amplified with the two universal its1 and its4 primers, sequenced, and digested with five restriction enzymes. the alignment of nucleotide sequences and analyses of digestion patterns indi ...200118944236
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