Infection ofStylosanthes guianensisandS. scabrabyColletotrichum gloeosporioides

Ogle, H. J.

doi:10.1094/phyto-80-837

Cited by 21 publications

(8 citation statements)

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“…De acordo com Ogle et al (1990), em espécies de Stylosanthes, as hifas subcuticulares de Colletotrichum gloeosporioides podem iniciar nova infecção sem a formação do apressório, pois essas hifas emergem do próprio tecido infectado. Na cultivar moderadamente resistente (Pérola), foi observado pouco micélio sobre os tricomas, sem indício de colonização tissular, ou seja, não havendo necroses evidentes (Figura 3, C e D).…”

Section: Análise Pré-infeccionalunclassified

Relação entre a estrutura foliar de feijoeiro e a pré-infecção por Glomerella cingulata f.sp. phaseoli

Jerba¹,

Rodella

Furtado

2005

Pesq. agropec. bras.

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Resumo -Os objetivos deste trabalho foram mensurar a área da nervura secundária e quantificar o número de tricomas da superfície foliar de cultivares de feijoeiro suscetível (Carioca), moderadamente resistente (Pérola) e resistente (IAPAR-81) à antracnose, e observar as relações entre tais características com o estágio pré-infeccional. Para mensurar a área da nervura secundária, fragmentos foliares foram amostrados, fixados em FAA 50, conservados em álcool 70%, infiltrados em resina glicol-metacrilato, cortados transversalmente e corados com azul de toluidina. Os tricomas foram quantificados em impressões epidérmicas em microscópio de projeção. Na análise pré-infeccional, o material foi fixado em glutaraldeído 2,5% e processado para o estudo ao microscópio eletrônico de varredura. A cultivar resistente apresentou menor área de nervura secundária e maior pilosidade que a cultivar moderadamente resistente e a suscetível. Na cultivar resistente, por causa da menor área de nervura e maior pilosidade, o patógeno permaneceu sobre a nervura e envolvido com o tricoma. Na cultivar suscetível, com maior área de nervura e menor pilosidade, foram observadas necrose e estruturas fúngicas na superfície foliar. Há relação entre estas características foliares e a resistência à antracnose durante o estágio pré-infeccional do patógeno.Termos para indexação: Phaseolus vulgaris, antracnose do feijoeiro, superfície foliar, tigmotropismo, tricomas. Relationship between bean leaf structure and the Glomerella cingulata f.sp. phaseoli preinfectionAbstract -The objectives of this work were to measure the secondary vein area and to quantify the trichomes of leaf surface in bean cultivar susceptible (Carioca), medium resistant (Pérola) and resistant (IAPAR-81) to anthracnose, and to observe relationships between leaf blade characteristics with the preinfectional stages. In order to measure the secondary vein area, sample leaf pieces were fixed in FAA 50 and conserved in 70% alcohol. These leaf samples were infiltrated in glycol metacrylate resin, cut transversally and stained with toluidine blue. The trichomes were quantified in epidermical impressions in projection microscopy. The material for preinfection analysis was fixed in 2.5% glutaraldehyde and processed to study the scanning electron microscopy. The resistant cultivar showed minor secondary vein area and high pilosity than the cultivar medium resistant and susceptible. In the resistant cultivar, due to minor vein area and high pilosity, the pathogen stayed on the vein and involved on the trichomes. In susceptible cultivar, with high vein and minor pilosity, necrosis and fungal structure on the leaf surface were observed. The results show a relation between the minor vein and high leaf trichomes quantity with the resistance to the anthracnose in pathogen preinfection stages.

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Section: Análise Pré-infeccionalunclassified

Relação entre a estrutura foliar de feijoeiro e a pré-infecção por Glomerella cingulata f.sp. phaseoli

Jerba¹,

Rodella

Furtado

2005

Pesq. agropec. bras.

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“…Type B strains cause extensive brown necrosis on S. guianensis . The two types were partially distinguished by classical morphological characteristics (Irwin & Cameron, 1978), by the mode of infection (Ogle et al ., 1990) and at the molecular level using various markers such as dsRNA (Dale et al ., 1988), rDNA (Braithwaite et al ., 1990a,b), RAPD (Manners et al ., 1993), and chromosomal number and arrangement (Masel et al ., 1990, 1993a,b, 1996).…”

Section: Introductionmentioning

confidence: 99%

Genetic relationships among isolates of Colletotrichum gloeosporioides from Stylosanthes spp. in Africa and Australia using RAPD and ribosomal DNA markers

et al. 1998

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Thirty-three isolates of Colletotrichum gloeosporioides from various Stylosanthes species collected in Africa and Australia and associated with restricted (type A), extensive (type B) or nontypical anthracnose lesions (type C) were first compared by random amplified polymorphic DNA (RAPD) analysis. A phylogenetic tree was constructed based on 118 reproducible polymorphic bands generated with 16 random primers, using the upgma method. Twenty-nine isolates were grouped in two main clusters, corresponding to types A and B, within which polymorphic subgroups were partially related to geographical origin. Strong similarities were observed among isolates of distant origin. Four isolates presented profiles completely different from the A and B types and were grouped in two additional clusters. To assess the phylogenetic relationship among isolates of various types and origins at the species level, the lnternal Transcribed Spacer region (ITS 1) of the ribosomal DNA was sequenced. Type A isolates and a restricted number of type B isolates selected in the RAPD clusters showed an homology of 99·4-100%. When compared with published sequence data, the isolates that were clustered separately in the phylogenetic tree, had the exact sequence of a C. gloeosporioides strain associated with the rotting of coffee berries, or of C. kahawae, the causal agent of coffee berry disease.

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“…The sub-cuticular RH are reported for C. gloeosporioides on the leaves of Stylosanthes spp. (Ogle et al 1990) and in many tropical and sub-tropical fruits (Coates and Gowanlock 1994). While the emerged hyphae of C. gloeosporioides on Stylosanthes leaves re-entered the host leaf by direct penetration of epidermal cells, in the present study, the SIH of C. gloeosporioides re-entered the castor leaves only through the stomata as in the case of C. dematium on mulberry leaf (Babu et al 2008).…”

Section: Discussionmentioning

confidence: 99%

An unusual method of development and sporulation ofColletotrichum gloeosporioideson castor leaf – an SEM account

Babu

Philip

Rajan

et al. 2011

Archives Of Phytopathology And Plant Protection

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Development and sporogenesis of Colletotrichum gloeosporioides on castor leaf differed from that on other known host plants. C. gloeosporioides had three kinds of hyphae on castor leaf: primary infection hyphae (PIH), runner hyphae (RH) and secondary infection hyphae (SIH). The PIH originated from conidia, grew on leaf surface and entered the leaf by direct penetration of the cuticle without forming appressoria. The RH were sub-cuticular hyphae, the track of which was traceable by the bulgings on the leaf surface, and the SIH were the hyphae that emerged to leaf surface from RH through the cuticle or stomata. Conidia were initiated as small protrusions along the lengths of RH and SIH that got differentiated into distinct conidia, each born on a short stumpy conidiophore without forming any congregation. The protrusions from RH emerged to the leaf surface by piercing the cuticle, and they developed into distinct conidia on the leaf surface. The conidia developed from RH and SIH were identical in size and shape. Even though conidia were occasionally found emerged through stomata, that appeared to be random than a preferred route for the discharge of conidia. The penetration and sporogenesis of C. gloeosporioides on castor leaf differed from that reported on mulberry leaf.

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Infection ofStylosanthes guianensisandS. scabrabyColletotrichum gloeosporioides

Cited by 21 publications

References 0 publications

Relação entre a estrutura foliar de feijoeiro e a pré-infecção por Glomerella cingulata f.sp. phaseoli

Relação entre a estrutura foliar de feijoeiro e a pré-infecção por Glomerella cingulata f.sp. phaseoli

Genetic relationships among isolates of Colletotrichum gloeosporioides from Stylosanthes spp. in Africa and Australia using RAPD and ribosomal DNA markers

An unusual method of development and sporulation ofColletotrichum gloeosporioideson castor leaf – an SEM account

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