Pigments and Pathogenesis

Saviola, Beatrice

doi:10.4172/2161-1068.1000168

Cited by 7 publications

(5 citation statements)

References 32 publications

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“…Diverse pigmentation among the isolates were observed ranging from white to violet to brown may suggest differences in the virulence of the isolates in this study towards P. nigrum L. Duarte and Archer, (2003) suggested that different pigmentation of the pathogen may have different toxigenic activity. Similarly, Saviola (2014) also reported pigment production in pathogen associated with increment in their virulence towards the host. Shahnazi et al, (2012) reported that F. solani isolated from P. nigrum L. with dark red pigmentation showed stronger pathogenicity.…”

Section: Discussionmentioning

confidence: 84%

Morphological and molecular characterization of Fusarium spp. associated with Fusarium wilt disease of Piper nigrum L. in Northwestern region of Sarawak

Tan¹,

Thanh²,

Rafael³

et al. 2021

MJM

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Aims: Piper nigrum L. (black pepper) is an economically important commodity plant in Malaysia, which generated RM 200.95 million from pepper export in the year of 2018. However, the increase in pepper production is restricted by diseases. Fusarium wilt is one of the major diseases of P. nigrum L. The objectives for this study were to isolate Fusarium spp. associated with Fusarium wilt of P. nigrum L. from selected pepper farms in the northwestern region of Sarawak and to characterize the Fusarium spp. isolated morphologically and molecularly. Methodology and results: Fusarium spp. were isolated from diseased root samples. The pathogen was grown on potato dextrose agar (PDA) under dark condition at circa (ca.) 25 °C for morphological characterisation. Molecular characterisation was done by using internal transcribed spacer (ITS). Phylogenetic tree was constructed to study the genetic relationship of the isolates. Fusarium solani, Fusarium oxysporum, Fusarim proliferatum were the three Fusarium species identified. There were variations in morphological characters observed between and among the species, including the colony form, margin, elevation, surface appearance and pigmentation. No distinctive morphological characteristic was specific to a location. In addition, growth rate, macroconidia sporulation rate, and microconidia sporulation rate of the isolates were not correlated. In molecular phylogeny, the three Fusarium species were separated into three distinct clades representing the three identified species. The genetic relatedness between isolates within each species was depicted in the tree. Conclusion, significance and impact of study: Variations were observed among isolates in this study based on morphological and molecular characterization. This study would contribute information on the variations of Fusarium spp. associated with Fusarium wilt of P. nigrum L. from the northwestern region of Sarawak.

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Section: Discussionmentioning

confidence: 84%

Morphological and molecular characterization of Fusarium spp. associated with Fusarium wilt disease of Piper nigrum L. in Northwestern region of Sarawak

Tan¹,

Thanh²,

Rafael³

et al. 2021

MJM

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“…A study found that pink pigment production in Acinetobacter wofii was induced by methanol as sole source of carbon [144]. Mycobacterium tuberculosis was found to produce carotenoid pigments in acidic stress at pH 5.0–6.0 and long-term growth in anaerobic culture conditions [145], and several other Mycobacterium species appeared to produce different pigments [146].…”

Section: Factors Affecting Pigment Productionmentioning

confidence: 99%

Multifaceted Applications of Microbial Pigments: Current Knowledge, Challenges and Future Directions for Public Health Implications

et al. 2019

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Microbial oddities such as versatile pigments are gaining more attention in current research due to their widely perceived applications as natural food colorants, textiles, antimicrobial activities, and cytotoxic activities. This indicates that the future generation will depend on microbial pigments over synthetic colorants for sustainable livelihood. Although several reviews have detailed the comprehensive applications of microbial pigments extensively, knowledge on several aspects of pigmented microbes is apparently missing and not properly reviewed anywhere. Thus, this review has been made to provide overall knowledge on biodiversity, distribution, pathogenicity, and ecological and industrial applications of microbial pigments as well as their challenges and future directions for food, industrial, and biomedical applications. Meticulously, this compendious review treatise on the pigments from bacteria, fungi, yeasts, and microalgae includes reports from the 1970s to 2018. A total of 261 pigment compounds produced by about 500 different microbial species are included, and their bioactive nature is described.

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“…On the other hand, they may exhibit virulence in bacteria. Pathogens survive for long term in abscesses, immune cells, and invasiveness due to pigment production [27,28].…”

Section: Discussionmentioning

confidence: 99%

Pseudomonas gessardii—A novel pathogenic bacterium associated with the cases of corneal ulcers and producing virulent pyoverdine pigment

Deepika¹

2022

J Appl Biol Biotech

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Bacterial corneal ulcer (BCU) is an infection that results into loss of vision (approx. 10%) and blindness. BCU requires constant attention since antibiotic treatment failure due to genetic alteration is common in microorganisms but the present study confirms that the ineffective treatment of corneal blindness is due to this novel bacterium. Around 300 corneal scrapings were performed in patients presenting with corneal ulcers from ophthalmology hospitals, government hospitals, and clinical laboratories of different places in Maharashtra, India. The novel pathogenic bacterium, i.e., Pseudomonas gessardii, was isolated from corneal ulcer samples from patients and identified using molecular characterization. The most common risk factors associated with BCU are contact lens and trauma. The pathogen produces a pyoverdine pigment, nitric oxide scavenger, exhibiting antioxidant activity. The novel bacterium is sensitive to the fluoroquinolones group of antibiotics and tobramycin. It is necessary to diagnose corneal ulcers at an early stage to reduce the probability of permanent loss of eye sight and corneal structural damage.Bacteria, fungi, viruses, parasites, or remote infections in the body account for the cause of corneal ulcers [5,6], and bacterial corneal ulcers (BCU) account for nearly 65%-90% of the infections. Tears and corneal scratches pave way for the entrance of bacteria resulting in an infection. Staphylococcus aureus, Streptococcus pneumoniae, Escherichia coli, Enterococci, Pseudomonas, Klebsiella, Proteus, Bacillus cereus, and many other bacteria are reported to cause corneal ulcers [2,5,[7][8][9][10].

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Pigments and Pathogenesis

Cited by 7 publications

References 32 publications

Morphological and molecular characterization of Fusarium spp. associated with Fusarium wilt disease of Piper nigrum L. in Northwestern region of Sarawak

Morphological and molecular characterization of Fusarium spp. associated with Fusarium wilt disease of Piper nigrum L. in Northwestern region of Sarawak

Multifaceted Applications of Microbial Pigments: Current Knowledge, Challenges and Future Directions for Public Health Implications

Pseudomonas gessardii—A novel pathogenic bacterium associated with the cases of corneal ulcers and producing virulent pyoverdine pigment

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