Sanidade de sementes de arroz, biocontrole, caracterização e transmissão de Curvularia lunata em semente-plântula de arroz

Silva, Mônica Shirley Brasil dos Santos e; Rodrigues, Antônia Alice Costa; Oliveira, Leonardo Pestillo de; Silva, Erlen Keila Candido e; Pereira, Tainan dos Santos

doi:10.1590/0034-737x201461040009

Cited by 14 publications

(14 citation statements)

References 6 publications

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“…These results are in agreement with Casa et al (2006), who stated that the pathogen makes use of organs or parts of the host for its survival and dissemination. Silva et al (2014) observed results similar to those of the present study in rice seeds when they reported that the fungus Curvularia lunata was detected in all the seedling organs at the three assessment times, where the mean transmission rates in the three periods were 51.75, 44.16 and 73.12 %, for the primary root, stalks and leaves, respectively. Corroborating this study, Casa et al (2006) stated that fungi associated with the seed can cause deterioration, or be transmitted to the seedling, colonizing the root and canopy organs.…”

Section: Quantification Of the Transmission Rate Of The Main Fungi Assupporting

confidence: 91%

Health quality and reduction of pathogenic transmission in tomato seeds using plant extracts

et al. 2019

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The objective of the present study was to assess the seed health quality, quantification of seed-seedling pathogen transmission and the effect of plant extracts in reducing plant pathogens in the seeds of the tomato varieties San Marzano and Ipa 6. For the seed health, the samples were disinfested, plated and assessed after seven days, according to the Brazilian Seed Analysis Rule. For the transmission rate, 12 trays were prepared with 100 seeds each and assessed at 7, 14 and 21 d.a.s. (days after seeding) using 100 seedlings. The plant (main root, stalk and leaves) tissues were plated in PDA culture medium and assessed after seven days of incubation. Aqueous extracts were prepared from cinnamon, basil, neem and eucalyptus with 0.5% concentration and the seeds were immersed in each solution for 10 minutes. Then, they plated and assessed after seven days. The health test showed that biggest incidences of Aspergillus fumigatus (26 %) and Aspergillus flavus (26 %) were occurred in the seeds of the varieties Ipa 6 and San Marzano, respectively. The fungi A. flavus, A. fumigatus, A. niger, R. stolonifer and Curvularia sp. were detected in quantification of transmission in the seeds of the two tomato varieties. The treatment with basil extract resulted in the least fungus incidence in the transmission quantification of ‘San Marzano’ tomato seeds, while on Ipa 6 seeds the eucalyptus treatment performed better. The interference of treatments was not observed in tomato seed germination. However, there was decrease in incident of pathogens in seeds treated with the plant extracts and different effects was observed based on type and species of the pathogen.

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Section: Quantification Of the Transmission Rate Of The Main Fungi Assupporting

confidence: 91%

Health quality and reduction of pathogenic transmission in tomato seeds using plant extracts

et al. 2019

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“…The morphological characteristics observed during the microscopic analysis suggested that the fungus genus isolated from Andropogon seeds is Curvularia lunata, similar to that described in the relevant literature (Ellis 1971;Sivanesan 1987). Other authors have also obtained similar results when examining species infecting other plants, for example, rice, Silva et al (2014) and Kusai et al (2016), characterized C. lunata colonies in BDA with cottony appearance and blackish-gray coloration. Also for these authors, the conidia presented three transverse septa, with a more voluminous median cell, pronounced curvature and dark hilum at one end, having average dimensions of 20.62 μm × 8.58 μm.…”

supporting

confidence: 63%

“…Most of these species are pathogenic and give rise to losses in agricultural production. In vegetables, there are several examples of diseases caused by this genus responsible in the main part for necrotic spots in the leaves of several plant families (Dasgupta et al 2005), especially Poaceae (Toledo et al 1990;Yago et al 2011;Silva et al 2014;Santos et al 2014;Kusai et al 2016).…”

mentioning

confidence: 99%

Morphological and molecular characterization of Curvularia lunata pathogenic to andropogon grass

et al. 2018

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The fungal genus Curvularia is associated with a number of diseases in plants, commonly producing foliar spots in forage grasses. The objective of this study was to characterize the morphological and molecular diversity of the isolates of Curvularia sp. associated with Andropogon seeds, and to assess both their capacity to transmit disease and the pathogenicity of this fungus to crop. Ten isolates of Curvularia sp. were sourced from Andropogon seeds from agricultural producing regions in the Brazilian states Tocantins and Pará. Morphological characterization was achieved by observing fungus colonies and conidia and molecular characterization by DNA extraction and amplification with sequence-specific primers.

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“…Several species of this genus may cause leaf spots, mainly in grasses FURTADO, 2007;YAGO et al, 2011). It may also be transmitted by seedplant (SILVA et al, 2014).…”

Section: Pathogenicitymentioning

confidence: 99%

Seeds of weeds as an alternative host of phytopathogens

Oliveira

Santos

2018

Arq. Inst. Biol.

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Weeds compete with agricultural crops for water, light, nutrients and space, besides having an extensive seed bank. However, another aspect to be considered relates to few studies pointing out weeds as hosts of phytopathogenic fungi. Many fungi, the main cause of diseases in plants, are known to use seeds as an efficient means of survival and dispersal. The objective of this work was to evaluate the health of weed seeds and the pathogenicity of fungi associated to plants of agricultural importance. The seeds were collected manually in Cerrado areas located in the municipality of Gurupi, Tocatins, Brazil. The blotter test method was used to evaluate seed health. The incidence of fungi was evaluated through an individual analysis of seeds using a stereoscopic and an optical microscope. The pathogenicity of fungi from weed seeds was evaluated by inoculation in plants of agronomic interest and, when pathogenic, we inoculated them in the host plant of the fungus. Weed seeds have been identified in fungi of the genus Alternaria, Aspergillus, Bipolaris, Cladosporium, Curvularia, Fusarium, Nigrospora, Papularia, Rhizopus and Pythium. The seeds of Acanthospermum australe, Bidens pilosa, Cenchrus echinatus, Digitaria horizontalis, Echinochloa crus-pavonis, Eleusine indica, Ipomoea sp., Pennisetum setosum, Sida rhombifolia, Spermacoce latifolia, Tridax procumbens and Vernonia polyanthes carry and disseminate fungi that, once inoculated, cause infection in plants of agricultural importance, such as Oryza sativa, Phaseolus vulgaris, Vigna unguiculata, Zea mays and Glycine max.

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Sanidade de sementes de arroz, biocontrole, caracterização e transmissão de Curvularia lunata em semente-plântula de arroz

Cited by 14 publications

References 6 publications

Health quality and reduction of pathogenic transmission in tomato seeds using plant extracts

Health quality and reduction of pathogenic transmission in tomato seeds using plant extracts

Morphological and molecular characterization of Curvularia lunata pathogenic to andropogon grass

Seeds of weeds as an alternative host of phytopathogens

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