Infection Behavior of<i>Venturia nashicola</i>, the Cause of Scab on Asian Pears

Park, P; Ishii, Hideo; Adachi, Yukio; Kanematsu, Satoko; Ieki, Hiroyuki; Umemoto, Seisaku

doi:10.1094/phyto.2000.90.11.1209

Cited by 42 publications

(49 citation statements)

References 17 publications

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“…They were dehydrated in ethanol series and embedded in Spurr's resin mixture (Nisshin EM, Tokyo, Japan). Ultrathin sections (90-120 nm) of macroconidia and vegetative hyphae were then stained with 4% uranyl acetate and lead citrate as described by Park et al (2000). For microconidia, semithin Fig.…”

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confidence: 99%

Cytological characteristics of microconidia of Magnaporthe oryzae

et al. 2009

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The inner cellular structure of microconidia of Magnaporthe oryzae was examined using fluorescent probes and electron microscopic techniques. The volume of the nucleus relative to the cell was significantly larger in microconidia than in macroconidia or vegetative hyphae, similar to observations for spermatia of other fungi. Selective fluorescent staining revealed that cytosolic RNA was less abundant in microconidia than in macroconidia and germ tubes, suggesting that general metabolic activity in microconidia is low. Consistently, GFP expression driven by the TrpC promoter was highly active during the formation of phialides and microconidia but gradually decreased as the microconidia matured. Such data suggest that microconidia are in a quiescent or dormant state.

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confidence: 99%

Cytological characteristics of microconidia of Magnaporthe oryzae

et al. 2009

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“…F, fungus; N, nucleus; OM, opaque matter; P, parenchyma cell; Pm, pit membrane; Sw, vessel secondary wall; VWLM, vessel wall lining material. the explanations given by others for seemingly similar matter (Park et al 2000). If the OM corresponded to altered host cytoplasm, this would not explain how it can infiltrate intact middle lamellae over long distances in a mostly homogeneous, compact form.…”

Section: Discussionmentioning

confidence: 89%

Histopathology of Fusarium wilt of staghorn sumac (Rhus typhina) caused by Fusarium oxysporum f. sp. callistephi race 3. II. Characteristics of opaque matter associated with extensive host cell and cell wall alterations

Ouellette

Rioux

Simard

2006

phyto

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AbstractLight and transmission electron microscopy observations of staghorn sumac plants inoculated or naturally infected withFusarium oxysporumf. sp.callistephiare reported. One aspect of infection was the presence of large intercellular masses of opaque matter (OM) in middle lamellae between ray cells and/or fibres, often bypassing several intercellular areas; similar OM confluent with the intercellular OM also occurred in secondary walls and in the periphery of numerous cells. A gradual increase in the abundance of the OM in host tissues vertically from the inoculation point and then radially was noted over infection time and was related to host wall and cell alterations. In the region of recently deposited tissue, the OM was associated with pronounced cell hyperplasia and hypertrophy. The OM was delimited by thin, compact bands, and when it was less compact, displayed opaque particles and other fine structures. No indications were obtained that it contained or had contained intact or altered organelles. The DNA probe bound to OM in middle lamellae and in cell periplasmic areas, and to material of a similar texture lining vessel walls. Samples fromFusarium-infected plants, incubated on an agar medium before fixing to determine from which elements the pathogens could develop, displayed bodies as the sole elements present in mature xylem cells and in intercellular areas. These bodies were delimited by membranous structures and profiles of a wall layer and contained opaque particles and areas of fine structures. Certain inter- or intracellular fungal cells in the same tissue frequently had similar content. In the light of these observations it is proposed that the OM is primarily of a pathogen rather than of a host origin.

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“…A particular variety of pears called "Singo" is susceptible to pear scab, and this variety constitutes approximately 81.5% of the pears produced in cultivation areas [23]. Pear scab has also affected pears cultivated in China and in Japan [24,25].…”

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confidence: 99%

An Empirical Assessment of the Economic Damage Caused by Apple Marssonina Blotch and Pear Scab Outbreaks in Korea

Kwon

Kim

et al. 2015

Sustainability

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Marssonina blotch in apples and pear scab are diseases that may affect apple and pear production as well as related industries significantly. The range and scale of the economic influence of such outbreaks should be clarified to ensure the sustainable growth of these industries. This study evaluates the direct and indirect economic effects of outbreaks through a partial equilibrium approach and an input-output model; direct influences are measured on the basis of reduced production, and the estimated costs are 34,926 million Korean Won (mKRW) (US$ 29.79 million) and 11,767 mKRW (US$ 10.04 million) for apples and pears, respectively. The indirect effects are determined according to changes in the quantity of apples and pears supplied to the market; these effects can induce social welfare losses. These costs are estimated to be 305,065 mKRW (US$ 259.08 million) for apples infected with Marssonina blotch, which accounts for 186,628 mKRW (US$ 158.50 million) in producer surplus and 118,437 mKRW (US$ 100.58 million) in consumer surplus and 72,693 mKRW (US$ 61.74 million) for pears infected with scab, which accounts for 44,106 mKRW (US$ 37.46 million) in producer surplus and 28,587 mKRW (US$ 24.28 million) in consumer surplus. The findings from this study can be referenced by the Korean government in designing more effective control measures toward sustainable growth of related industry.

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Infection Behavior ofVenturia nashicola, the Cause of Scab on Asian Pears

Cited by 42 publications

References 17 publications

Cytological characteristics of microconidia of Magnaporthe oryzae

Cytological characteristics of microconidia of Magnaporthe oryzae

Histopathology of Fusarium wilt of staghorn sumac (Rhus typhina) caused by Fusarium oxysporum f. sp. callistephi race 3. II. Characteristics of opaque matter associated with extensive host cell and cell wall alterations

An Empirical Assessment of the Economic Damage Caused by Apple Marssonina Blotch and Pear Scab Outbreaks in Korea

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