Variability of aggressiveness and virulence of Phytophthora palmivora influencing the severity of papaya fruit rot in postharvest in Bahia, Brazil

Oliveira, Thiago Alves Santos de; Blum, Luiz Eduardo Bassay; Duarte, Elizabeth Amélia Alves; Moreira, Zayda Piedad Morales; Luz, Edna Dora M. Newman

doi:10.15361/1984-5529.2016v44n2p185-195

Cited by 10 publications

(5 citation statements)

References 14 publications

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“…effect. The mycelial growth speed index (MGSI) was calculated according to Oliveira et al (2016). The MGSI was determined according to Eq.…”

Section: In Vitro Antagonism Assaysmentioning

confidence: 99%

The plant growth effect and biocontrol potential of Trichoderma sp. inoculation in tomatoes are dependent of the inoculation way

Sandri,

Cavião,

Oliveira

et al. 2024

Bragantia

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Tomato is an important economic crop due to its consumption and production worldwide. However, like other crops, it is susceptible to pathogens, being necessary agrochemicals to prevent diseases and improve the production of fruits. Among the sustainable alternatives to crop production, microbial inoculants are used as biofungicide and biostimulants for plant development. Thus, this work aimed to evaluate the biocontrol potential of seven Trichoderma spp. isolates (T1, T2, T3, T4, T15, T17, and T19) against tomato pathogens in vitro experiments, and their potential to improve tomato growth. The Trichoderma spp. antagonism was investigated against Alternaria sp. 003/09, Botrytis sp. 006/13, Fusarium sp. 007/09, and Stemphylium sp. A73. Dual culture, volatile, and diffusible compounds activity tests showed that all new Trichoderma spp. tested could reduce the mycelial growth of all tested pathogens, highlighting T15 and T17 isolates. Seed and soil inoculation revealed very contrasting results: Trichoderma sp. T17 showed a beneficial effect when inoculated in soil, reducing the percentage of yellowish leaves, and increasing dry weight and stem diameter. Inoculation of Trichoderma sp. T17 in the seed increases hypocotyl and radicle lengths, and the seed vigor index. Finally, the strains studied present the potential to be used to develop biocontrol products.

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“…effect. The mycelial growth speed index (MGSI) was calculated according to Oliveira et al (2016). The MGSI was determined according to Eq.…”

Section: In Vitro Antagonism Assaysmentioning

confidence: 99%

The plant growth effect and biocontrol potential of Trichoderma sp. inoculation in tomatoes are dependent of the inoculation way

Sandri,

Cavião,

Oliveira

et al. 2024

Bragantia

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show abstract

“…The mycelial growth was daily measured using a digital caliper, and the data was converted into the mycelial growth rate index (MGRI) by using the formula: Σ [(ddp)/N], where: d represents the mean colony diameter at the present day; dp represents mean colony diameter from the previous day; and N represents number of days after incubation. Furthermore, the mycelial growth inhibition (MGI) was determined in the 14 th day of the experiment according to [(dc -dt)/dc] × 100, where: dc and dt represent the mean colony diameters of control and treated groups, as described by Oliveira et al (2016).…”

Section: In Vitro Antagonismmentioning

confidence: 99%

Bacillus subtilis strain F62 against Fusarium oxysporum and promoting plant growth in the grapevine rootstock SO4

Russi

Almança

Schwambach

2022

An. Acad. Bras. Ciênc.

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Fusarium wilt is a fungal disease that causes economic losses to viticulture, whose causal agent Fusarium sp. has been associated with the decline and death of young vines. This work had the objective of evaluating the antagonistic potential of Bacillus subtilis F62 against F. oxysporum in vitro and in vivo, as well as the growth promotion in the grapevine rootstock SO4. In the in vitro assay, the antagonism by diffusible and volatile compounds of B. subtilis F62 and the inhibition of conidial germination of four Fusarium sp. isolates were evaluated. In the in vivo assay, cuttings and micropropagated plants of SO4 were submitted to four treatments: control, Bac (B. subtilis F62 inoculation), Fus (F. oxysporum inoculation) and Bac + Fus. We observed that inhibition of mycelial growth occurred mainly by diffusible compounds. B. subtilis F62 had a positive effect on the growth promotion and in the biocontrol of F. oxysporum, reducing the frequency of pathogen re-isolation in cuttings (18.1%) and in micropropagated plants (52.4%). These results demonstrate the ability of B. subtilis F62 to upgrade plant development and assist in controlling of the Fusarium wilt in the grapevine rootstock SO4.

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“…P. capsici dilaporkan memproduksi sporangia dengan bentuk dan ukuran yang beragam (Wahyuno, Manohara, & Susilowati, 2007). Selain itu, Phytophthora pada umumnya juga mempunyai patogenisitas yang beragam sehingga akan mempengaruhi keparahan penyakit dengan intensitas yang berbeda (de Oliveira, Blum, Duarte, Moreira, & Luz, 2016;Wahyuno, et al, 2007).…”

Section: Pendahuluanunclassified

Patogen Penyakit Busuk Buah Kakao: Karakter dan Patogenisitas Phytophthora palmivora Isolat Asal Pakuwon, Sukabumi

Wartono

Taufiq

2021

J. tanam. industri dan penyegar

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Phytophthora palmivora (Butl.) is a major obstacle in cocoa cultivation worldwide. The study aimed to determine the morphological character and pathogenicity of P. palmivora Pakuwon isolate. The study was carried out from November 2020 to January 2021, which consisted of 3 activities e.g. (1) pathogen isolation, tests on growth rate and colony formation, and stimulation of sporangia, zoospore, and clamydospore formation, which was performed in CMA, PDA, and mung bean media. The parameters observed were colony shape, growth rate, shape and size of sporangia, papillae, and sporangiophores, also chlamydospore and hyphal diameters; (2) To determine the possibility of different mating types, two isolates were grown on CMA medium in one petri dish; (3) The pathogenicity test, using a detached fruit assay by inoculating the cocoa pods with mycelium plug and zoospores. The patogenicity test was conducted in a completely randomized design with 4 replications, and the parameter observed was the area of the spot. The isolation obtained 3 isolates, the mycelium of all three isolates showed white in color, cottony, and no pattern in shape. The diameters of hyphae and chlamydospores were 5.6 - 6.3 mm and 39.0 - 43.2 mm, respectively. The sporangia were ovoid, ellipsoid, subsperic, obpyriform, and irregular. Sporangia measured 5.6 - 60.1 mm in length and 30.4 - 32.9 mm in width. Papillae were obviously visible with an average length of 6.8 mm. Test on mating types showed no oospores formed. PPkw1 isolates showed higher growth rates and more pathogenic than PPkw2 and PPkw3. The difference of pathogenicity of each P. palmivora isolates originated from Pakuwon can be used for selection of cocoa resistance in the future.

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Variability of aggressiveness and virulence of Phytophthora palmivora influencing the severity of papaya fruit rot in postharvest in Bahia, Brazil

Cited by 10 publications

References 14 publications

The plant growth effect and biocontrol potential of Trichoderma sp. inoculation in tomatoes are dependent of the inoculation way

The plant growth effect and biocontrol potential of Trichoderma sp. inoculation in tomatoes are dependent of the inoculation way

Bacillus subtilis strain F62 against Fusarium oxysporum and promoting plant growth in the grapevine rootstock SO4

Patogen Penyakit Busuk Buah Kakao: Karakter dan Patogenisitas Phytophthora palmivora Isolat Asal Pakuwon, Sukabumi

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