Incidence of Alternaria brassicicola (Schw.) Wiltsh. on Brassica oleracea seeds

1992 ◽  
Vol 32 (4) ◽  
pp. 535 ◽  
Author(s):  
A Sivapalan ◽  
JW Browning
Keyword(s):  
Brassica Oleracea ◽  
Primary Source ◽  
Alternaria Brassicicola ◽  
Alternaria Brassicae ◽  
Brassica Crops

Samples of Brassica oleracea seed from Victoria, were tested for the presence of seed-borne Alternaria brassicicola and Alternaria brassicae. A. brassicicola was detected in 26 of 44 samples tested but A. brassicae was not detected in any. Between 24 and 37% of seed was infected, with 4-8% of infection found in the embryo tissues. Inoculation of seed with A. brassicicola resulted in loss of vigour in germinated seedlings, followed by death. The fungus retained its viability and pathogenicity on seed stored for up to 12 months. This investigation indicates that a high proportion of commercially available brassica seed are contaminated with A. brassicicola and may therefore be a primary source of disease for brassica crops in Australia.

Infection cycle of Alternaria brassicicola on Brassica oleracea leaves under growth room conditions

2018 ◽  
Vol 67 (5) ◽  
pp. 1088-1096 ◽  
Author(s):  
V. K. Macioszek ◽  
C. B. Lawrence ◽  
A. K. Kononowicz
Keyword(s):  
Brassica Oleracea ◽  
Alternaria Brassicicola ◽  
Infection Cycle ◽  
Growth Room

scholarly journals Levantamento da intensidade da alternariose e da podridão negra em cultivos orgânicos de brássicas em Pernambuco e Santa Catarina

2006 ◽  
Vol 24 (4) ◽  
pp. 464-469 ◽  
Author(s):  
Luiz A M Peruch ◽  
Sami J Michereff ◽  
Issac B Araújo
Keyword(s):  
Xanthomonas Campestris ◽  
Alternaria Brassicicola ◽  
Alternaria Brassicae ◽  
Santa Catarina ◽  
Xanthomonas Campestris Pv Campestris

O objetivo deste trabalho foi avaliar a intensidade da alternariose, causada por Alternaria brassicicola e/ou Alternaria brassicae, e da podridão negra, causada por Xanthomonas campestris pv. campestris, em cultivos orgânicos de brássicas em Pernambuco e Santa Catarina. Os levantamentos foram realizados no período de novembro de 2001 a fevereiro de 2002, num total de 103 cultivos orgânicos de várias espécies de brássicas. Foram registradas elevadas prevalências das doenças nos estados, com exceção em couve-chinesa em Santa Catarina. A prevalência da alternariose foi 100% nos cultivos de brócolis em Pernambuco, bem como em couve-flor nos dois estados, enquanto a podridão negra atingiu esse nível nos cultivos de brócolis e couve-flor em Santa Catarina. Na média das diferentes espécies de brássicas, as doenças foram mais prevalentes em Pernambuco que Santa Catarina. Entretanto, as médias de severidade de cada doença no conjunto das brássicas não foram diferentes entre os estados, embora as condições climáticas tenham sido nitidamente distintas. A severidade da alternariose variou entre as espécies de brássicas somente em Pernambuco, com a menor severidade registrada em couve-manteiga. Em relação à podridão negra, apenas em Santa Catarina houve diferença na severidade entre as brássicas, sendo registrados os menores níveis em couve-chinesa. Não foram constatadas correlações significativas entre os níveis de severidade da alternariose e da podridão negra, bem como da severidade destas com o número total de plantas e a idade das plantas nos cultivos.

On the promotion of senescence in Brassica oleracea var. capitata by Alternaria brassicicola and by Botrytis cinerea

1979 ◽  
Vol 57 (21) ◽  
pp. 2378-2386 ◽  
Author(s):  
P. A. Poapst ◽  
B. Anne Ramsoomair ◽  
C. O. Gourley
Keyword(s):  
Carbon Dioxide ◽  
Gibberellic Acid ◽  
Brassica Oleracea ◽  
Botrytis Cinerea ◽  
Ethylene Production ◽  
Ferrous Sulfate ◽  
Potassium Salt ◽  
Alternaria Brassicicola ◽  
Stimulation Of ◽  
Floating Leaf

Alternaria brassicicola and Botrytis cinerea stimulated ethylene production in closed culture with floating leaf discs from cabbage (Brassica oleracea var. capitata). Production with A. brassicicola had an observed maximum at 18 °C and was speeded by preculturing the fungus on media containing cabbage components, but which contained little or no methionine.In the absence of cabbage tissue, both organisms demonstrated a latent capacity to generate ethylene from closed shake cultures of Czapek's medium containing L-methionine. With A. brassicicola in a modified Czapek's medium (minus ferrous sulfate) containing 10−3 ML-methionine, there was a stimulation of ethylene production at 18 °C by the addition of Fe2+, Fe3+, Cu2+, ca. 8% carbon dioxide, or the potassium salt of gibberellic acid (GA3). With B. cinerea, 4% carbon dioxide was stimulatory, 29% carbon dioxide was inhibitory, whereas less than 4% oxygen arrested the production of ethylene completely for 48 h.Results suggest that the nature of parasitism of A. brassicicola and B. cinerea on cabbage is characterized by a latent capability to cause the production of, and to produce, the plant-senescing hormone ethylene.

scholarly journals Near-Complete Genome Assembly of Alternaria brassicae—A Necrotrophic Pathogen of Brassica Crops

2019 ◽  
Vol 32 (8) ◽  
pp. 928-930 ◽  
Author(s):  
Sivasubramanian Rajarammohan ◽  
Deepak Pental ◽  
Jagreet Kaur
Keyword(s):  
Genome Assembly ◽  
Fungal Pathogen ◽  
Complete Genome ◽  
Alternaria Brassicae ◽  
Necrotrophic Pathogen ◽  
Alternaria Blight ◽  
Brassica Crops ◽  
Genome Information ◽  
Important Disease ◽  
Chromosome Level

Alternaria brassicae, a necrotrophic fungal pathogen, causes Alternaria blight, an important disease of brassica crops. Although many Alternaria spp. have been sequenced, no genome information is available for A. brassicae, a monotypic lineage within the Alternaria genus. A highly contiguous genome assembly of A. brassicae has been generated using Nanopore MinION sequencing with an N50 of 2.98 Mb, yielding nine full chromosome-level sequences. This study adds to the current genomic resources available for the genus Alternaria and will provide opportunities for further analyses to unravel the mechanisms underlying pathogenicity of this important necrotrophic pathogen.

Diversity in Alternaria brassicae (Berk.) Sacc. isolates and characterization of host response in different oilseed Brassica species

2019 ◽  
Vol 4 (01) ◽  
pp. 41-48
Author(s):  
Geeta Devi ◽  
R. P. Awasthi ◽  
A. K. Tiwari ◽  
Arvind Kumar
Keyword(s):  
Solid Medium ◽  
Morphological Variability ◽  
Brassica Species ◽  
Alternaria Brassicae ◽  
Quantitative Characters ◽  
Brassica Crops ◽  
Percent Disease Index ◽  
Qualitative Characters ◽  
Variability Study

Alternaria brassicae (Berk.) Sacc., a necrotrophic fungus devastating oilseed Brassica crops in India, causes up to 47% reduction in seed yield. So the study is conducting to develop the knowledge about the variability of A. brassicae in terms of cultural, morphological, pathogenic characters and their effects on different Brassica species of rapeseed mustard, for minimizing the losses caused by A. brassicae and help to stabilize the rapeseed mustard production. In variability study, all the isolates showed cultural, morphological variability. Average conidial length was maximum in isolate Ab2 (21.7μ) followed by Ab4 (20.7μ) and minimum in Ab8 (15.6μ). Septation in conidia, both horizontal and vertical also showed variation in different isolates. Finally it was revealed that smallest size of conidia in isolates Ab8 and longest size of conidia in isolates Ab4 were observed. On solid medium, maximum sporulation was observed in Ab7 followed while minimum sporulation recorded in Ab8. On liquid medium, maximum sporulation was observed in Ab7 while minimum sporulation recorded in Ab8. All the isolates showed the variability in qualitative characters i.e. spot colour, presence or absence of central point, concentric rings and yellow halo and as well as in quantitative characters i.e. incubation period and Percent Disease Index.

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