Infection process and host range of Colletotrichum capsici

Pring, R. J.; Nash, C.; Zakaria, Maziah; Bailey, J. A.

doi:10.1006/pmpp.1995.1011

Cited by 63 publications

(61 citation statements)

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“…Based on these results they concluded that turgor pressure of C. kahawae appressoria might play a major role in coffee cuticle penetration. Following penetration, Colletotrichum species use two main strategies to successfully colonise host tissues and avoid host defence responses: subcuticular intramural colonization and intracellular colonization (Benhamou et al, 1991;O´Connell and Bailey, 1991;Bailey et al, 1992;Pring et al, 1995;Latunde-Dada et al, 1996;O´Connell et al, 1996;Latunde-Dada et al, 1997;O´Connell et al, 2000;LatundeDada, 2001;Mendgen and Hahn, 2002;Diéguez-Uribeondo et al, 2005). For Colletotrichum species exhibiting a subcuticular intramural mode of infection, penetration is followed by growth of hyphae beneath the cuticle and within the periclinal and anticlinal walls of epidermal cells in a necrotropic manner, which involve the massive secretion of cell wall-degrading enzymes.…”

Section: Fungal Infection Processmentioning

confidence: 99%

Coffee resistance to the main diseases: leaf rust and coffee berry disease

Silva

Várzea

Guerra‐Guimarães

et al. 2006

Braz. J. Plant Physiol.

188

147

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Considerable success has been obtained in the use of classical breeding to control economically important plant diseases, such as the coffee leaf rust and the coffee berry disease (CBD). There is a strong consensus that growing genetically resistant varieties is the most appropriate cost effective means of managing plant diseases and is one of the key components of crop improvement. It has also been recognized that a better knowledge of both, the pathogens and the plant defence mechanisms will allow the development of novel approaches to enhance the durability of resistance. After a brief description of concepts in the field of plant disease resistance, we attempt to give a view of the research progress on coffee leaf rust and CBD concerned with the pathogens infection and variability, coffee breeding for resistance and coffee resistance mechanisms. Key words: Coffea, Colletotrichum kahawae, Hemileia vastatrix, coffee breeding, resistance.Resistência do cafeeiro para suas principais doenças: ferrugem alaranjada das folhas e antracnose dos frutos: Sucesso considerável tem sido obtido no uso do melhoramento clássico para o controle de doenças de plantas economicamente importantes, tais como a ferrugem alaranjada das folhas e a antracnose dos frutos do cafeeiro (CBD). Há um grande consenso de que o uso de plantas geneticamente resistentes é o meio mais apropriado e eficaz em termos de custos do controle das doenças das plantas, sendo também um dos elementos chave do melhoramento da produção agrícola. Tem sido também reconhecido que um melhor conhecimento do agente patogênico e dos mecanismos de defesa das plantas permitirá o desenvolvimento de novas abordagens no sentido de aumentar a durabilidade da resistência. Após uma breve descrição de conceitos na área da resistência das plantas às doenças, nesta revisão tentou-se dar uma idéia do progresso na investigação da ferrugem alaranjada do cafeeiro e do CBD relativamente ao processo de infecção e variabilidade dos agentes patogênicos, melhoramento do cafeeiro para a resistência e mecanismos de resistência do cafeeiro. Palavras-chave: Coffea, Colletotrichum kahawae, Hemileia vastatrix, melhoramento do cafeeiro, resistência.

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Section: Fungal Infection Processmentioning

confidence: 99%

Coffee resistance to the main diseases: leaf rust and coffee berry disease

Silva

Várzea

Guerra‐Guimarães

et al. 2006

Braz. J. Plant Physiol.

188

147

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“…The subcuticular intramural invasion strategy is characterised by the growth of the pathogen beneath the cuticle and within the periclinal walls of epidermal cells (Bailey et al 1990). Colletotrichum capsici (Pring et al 1995), C. truncatum (Manandhar et al 1985), C. circinans, and C. phomoides (Bailey et al 1992) have been reported to use this strategy.…”

Section: Introductionmentioning

confidence: 99%

Ultrastructure of the early stages of Colletotrichum acutatum infection of strawberry tissues

Arroyo¹,

Moreno²,

Garcı́a-Herdugo³

et al. 2005

Can. J. Bot.

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Abstract:The early stages of the infection of attached leaves and petioles of strawberry (Fragaria ×ananassa Duch. 'Camarosa') by Colletotrichum acutatum Simmonds were studied using scanning and transmission electron microscopy. Pre-penetration events of these tissues were similar, but the production of secondary conidia (microcyclic conidiation) was detected only on leaves. At the ultrastructural level, different stages of maturation of appressoria were observed and described. In young appressoria, the cell wall was composed of two layers and the plasma membrane displayed a wavy appearance. In the following stage, the appressorium developed a third electron-transparent layer between the cell wall and the plasma membrane. This new electron-transparent material was especially visible in the region of the appressorium near the cuticle. The plasma membrane of this appressorium showed a smooth appearance. Afterwards, a penetration peg emerged through the pore penetrating the cuticle and reached the epidermal wall where it enlarged to form an intramural infection vesicle. Both structures of infection, the penetration peg and the intramural infection vesicle, produced during the early phases of infection of strawbery tissues by C. acutatum, have not been previously reported and confirm that its invasion strategy is that of a subcuticular intramural pathogen. Once the infection was well established, abundant subcuticular and intramural hyphae were produced on petioles, causing severe degradation of the host cell walls. Occasionally, the cuticle appeared disrupted in those regions where the host walls were very degraded and dilated. Differences between colonization of petioles and leaves were observed.Key words: Colletotrichum acutatum, Fragaria ×ananassa, infection vesicle, invasion strategy, penetration peg.Résumé : À l'aide de la microscopie électronique par balayage et par transmission, les auteurs ont étudié les premiers stades de l'infection des feuilles attachées et des pétioles du fraisier (Fragaria ×ananassa Duch. 'Camarosa'), par le Colletotrichum acutatum Simmonds. Les évènements de pré-pénétration de ces tissus sont similaires, mais la production de conidies secondaires (conidiation microcyclique) ne s'observe que sur les feuilles. Les auteurs ont observé et décrivent les ultrastructures, aux différents stades de maturation des appressoriums. Chez les jeunes appressoriums, la paroi cellulaire est composée de deux couches et la membrane plasmique montre une apparence ondulée. Au stade suivant, l'appressorium développe une troisième couche transparente aux électrons, entre la paroi cellulaire et la plasmalemme. Ce nouveau matériel transparent aux électrons est particulièrement visible dans la région de l'appressorium voisin de la cuticule. La plasmalemme de cet appressorium est d'apparence lisse. Par après, l'hyphe de pénétration émerge à travers le pore et pénètre la cuticule pour atteindre la paroi épidermique, où il s'élargit pour former une vési-cule d'infection intramurale. Les deux structures d'infection...

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“…At 120 h.a.i, vesicles and hyphae were found in the epidermal ( Figure 2C), and in the parenchymal cells ( Figure 2D). Figure 3 summarizes the chronology of events involved in infection and colonization of guava fruit by Colletotrichum gloeosporioides.On the other hand, different colonization strategies were observed by C. acutatum and C. fragariae in strawberry (CURRY et al, 2002), C. capsici in cowpea (PRING et al, 1995) and C. gloeosporioides in papaya (CHAU; ALVAREZ, 1983) because these species did not invade the host cells to form a biotrophic relationship with the protoplast. Instead, the infection hyphae grow underneath the cuticle and inside the periclinal and anticlinal wall of the epidermal cells.…”

mentioning

confidence: 99%

Histopathology of Colletotrichum gloeosporioides on guava fruits (Psidium guajava L.)

2013

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-Anthracnose, caused by Colletotrichum gloeosporioides, produces brown lesions on guava fruits, causing severe losses on postharvest. In this study, the infection and colonization of guava fruits by C. gloeosporioides has been examined using scanning and transmission electron microscopy. Fruits at the physiologically mature stage were inoculated with a 10 5 conidia/mL spore suspension. Afterward, fruits were incubated at 25 °C in a wet chamber for periods of 6, 12, 24, 48, 96 and 120 h to allow examination of the infection and colonization process. Conidia germination and appressoria formation occurred six hours after inoculation (h.a.i). Penetration occurred directly via penetration pegs from appressoria, which penetrated the host cuticle 48 h.a.i. Notably, the appressoria did not produce an appressorial cone surrounding the penetration pore. Infection vesicles were found in epidermal cells 96 h.a.i. The same fungal structures were found in epidermal and parenchymal cells of the host 120 h.a.i. Colonization strategy of C. gloeosporioides on guava fruit was intracellular hemibiotrophic. Index terms: colonization, penetration, pre-penetration, ultrastructure. HISTOPATOLOGIA DE Colletotrichum gloeosporioides EM FRUTOS DE GOIABEIRA (Psidium guajava L.).RESUMO -A antracnose, causada por Colletotrichum gloeosporioides, é caracterizada por lesões marrons nos frutos de goiabeira, causando severas perdas em pós-colheita. Os processos de infecção e colonização de C. gloeosporioides foram estudados usando microscópio eletrônico de varredura e transmissão. Frutos em plena maturação fisiológica foram inoculados com suspensão de 10 5 conídios/mL. Posteriormente, os frutos foram incubados em câmara úmida a 25 °C, por períodos de molhamento de 6; 12; 24; 48; 96 e 120 h para o estudo do processo de infecção e colonização. Germinação de conídios e formação de apressórios ocorreram seis horas após a inoculação (h.a.i). A penetração ocorreu diretamente, por meio da formação do peg de penetração emitido da base do apressório, o qual penetrou na cutícula 48 h.a.i. O apressório não produziu o cone apressorial ao redor do poro de penetração. Foram observadas vesículas de infecção nas células epidérmicas 96 h.a.i. As mesmas estruturas fúngicas foram encontradas nas células epidérmicas e parenquimáticas do hospedeiro, após 120 h da inoculação. A estratégia de colonização de C. gloeosporioides foi do tipo hemibiotrófica intracelular. Termos para indexação: Colonização, penetração, pré-penetração, ultraestrutura. JEGER, 1992;JEFFRIES et al., 1990;PRUSKY;FREEMAN;DICKMAN, 2000). Although anthracnose symptoms may appear in the field, depending on the host and environmental conditions, Colletotrichum also cause quiescent infections in fruit, placing them amongst the most important postharvest pathogen. Thereby the pathogen infects the fruit still in the field, but symptoms appear only during ripening (JEFFRIES et al. 1990).Anthracnose is one of the main guava diseases in all guava-growing countries, causing considerable postharvest...

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Infection process and host range of Colletotrichum capsici

Cited by 63 publications

References 0 publications

Coffee resistance to the main diseases: leaf rust and coffee berry disease

Coffee resistance to the main diseases: leaf rust and coffee berry disease

Ultrastructure of the early stages of Colletotrichum acutatum infection of strawberry tissues

Histopathology of Colletotrichum gloeosporioides on guava fruits (Psidium guajava L.)

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