Ulvan effect on conidial germination and appressoria formation of Colletotrichum gloeosporioides

Araújo, Leonardo; Gonçalves, Amanda Emy; Stadnik, Marciel J.

doi:10.1007/s12600-014-0404-7

Cited by 23 publications

(13 citation statements)

References 32 publications

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“…Initial events in the pathogenesis of certain pathogens on the surface of their hosts can be distinct according to the levels of resistance against the pathogens; this can therefore result in different levels of disease severity (Araujo et al. ,c, ). The apparent abundance of trichomes on the adaxial leaf surface of plants from cultivar Fundacep 59 in comparison with cultivar TMG 132 may have impaired the deposition and germination of the conidia of C. cassiicola .…”

Section: Discussionmentioning

confidence: 99%

“…Some pathogens are able to form a second appressorium in case the first one fails to penetrate the host tissue; however, not all conidia have sufficient energy to invest in this event (Dean ; Araujo and Stadnik ; Gonçalves and Stadnik ; Araujo et al. ). In the present study, the formation of two appressoria‐like structures per conidium of C. cassiicola indicated that it had sufficient energy to produce them.…”

Section: Discussionmentioning

confidence: 99%

“…An appressorium-like structure was formed by C. cassiicola at one or both extremities of the conidium, and preferentially at the major and minor veins on the adaxial leaf surface of plants from both cultivars. Some pathogens are able to form a second appressorium in case the first one fails to penetrate the host tissue; however, not all conidia have sufficient energy to invest in this event (Dean 1997;Araujo and Stadnik 2011;Gonc ßalves and Stadnik 2012;Araujo et al 2014c). In the present study, the formation of two appressoria-like structures per conidium of C. cassiicola indicated that it had sufficient energy to produce them.…”

Section: Discussionmentioning

confidence: 99%

“…Germinated conidia of Colletotrichum gloeosporioides showed different patterns of appressoria formation and germ tube growth on the leaves of apple cultivars that differed in their levels of resistance to Glomerella leaf spot (Araujo et al. ). Typical host defence mechanisms such as the accumulation of phenolics, as indicated by staining of the leaf tissue with toluidine blue, reduced the colonization of Ceratocystis fimbriata on the stem of mango plants as well as the colonization of Pyricularia oryzae on rice leaves (Rodrigues et al.…”

Section: Introductionmentioning

confidence: 99%

“…At the microscopic level, several studies have demonstrated differences of defence responses between resistant and susceptible plants during the infection process of fungal pathogens (Rodrigues et al 2003;Araujo et al 2014aAraujo et al ,b,c, 2015Araujo et al , 2016Fortunato et al 2014;Silva et al 2015). Germinated conidia of Colletotrichum gloeosporioides showed different patterns of appressoria formation and germ tube growth on the leaves of apple cultivars that differed in their levels of resistance to Glomerella leaf spot (Araujo et al 2014c). Typical host defence mechanisms such as the accumulation of phenolics, as indicated by staining of the leaf tissue with toluidine blue, reduced the colonization of Ceratocystis fimbriata on the stem of mango plants as well as the colonization of Pyricularia oryzae on rice leaves (Rodrigues et al 2003;Araujo et al 2014aAraujo et al , 2015Araujo et al , 2016.…”

Section: Introductionmentioning

confidence: 99%

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Association of the Production of Phenylpropanoid Compounds at the Infection Sites of Corynespora cassiicola with Soybean Resistance against Target Spot

Fortunato

Araújo

Rodrigues

2016

Journal of Phytopathology

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This study investigated, at the microscopic level, whether the differential defence responses of soybean cultivars that are resistant (Fundacep 59) and susceptible (TMG 132) to target spot, caused by Corynespora cassiicola, could be associated with an increase in the production of phenolics, flavonoids and lignin at the infection sites. Many larger necrotic lesions with yellow halos were noticed on the leaves of plants from cultivar TMG 132, in contrast to the leaves of plants from cultivar Fundacep 59. Necrotic lesions also developed on the petioles of leaves of plants from cultivar TMG 132, while on the petioles and veins of leaves of plants from cultivar Fundacep 59, the lesions were of purple colour. The growth of fungal hyphae was reduced on the leaves of plants from cultivar Fundacep 59, and an apparently high density of trichomes was found in comparison with the leaves of plants from cultivar TMG 132. An appressorium‐like structure was produced at one or both extremities of the conidium of C. cassiicola, preferentially at the major and minor veins on the adaxial leaf surface of plants from both cultivars. Most cells on the leaves of plants from cultivar Fundacep 59 reacted against C. cassiicola infection by accumulating phenolic‐like compounds, which contributed to the death of many fungal hyphae and a greater maintenance of cell integrity. In contrast, fungal hyphae grew without any impedance in the leaf cells of plants from cultivar TMG 132, which was associated with signs of intense leaf tissue disorganization. Stronger autofluorescence and deposition of lignin and flavonoids were found in the cells of leaves of plants from cultivar Fundacep 59, in contrast to cultivar TMG 132. It can be concluded that soybean resistance to target spot is probably dependent on the activation of the phenylpropanoid pathway.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%