First Report of <i>Pantoea stewartii</i> subsp. <i>indologenes</i> Causing Leaf Blight on Rice in Malaysia

Azizi, Mohammad Malek Faizal; Ismail, Siti Izera; Hata, Erneeza Mohd; Zulperi, Dzarifah; Yasin, Ina Salwany Md; Abdullah, M. A. F.

doi:10.1094/pdis-08-18-1403-pdn

Cited by 19 publications

(15 citation statements)

References 4 publications

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“…In the period of November-December 2017 of the second season of rice planting in Malaysia, several rice plots showed water-soaked lesions at the tip of the leaf and became brownish lines along the leaf margin. The causative pathogen was subsequently identified as P. stewartii [31]. Similar symptoms had also been detected in another local case at Selangor, Malaysia in 2016.…”

Section: Detrimental Impacts Of Pantoea-rice Plant Interactions Leading To Rice Diseasessupporting

confidence: 65%

“…They show negative reactions towards oxidation, arginine dihydrolase, citrate utilization, sorbitol fermentation and nitrate test. On the other hand, these species are positive for catalase, gelatine and starch hydrolysis tests [29][30][31]. Bacteria from this genus are also capable of exhibiting acid production from various carbon sources such as maltose, trehalose, palatinose and L-arabinose [32].…”

Section: Classification and Biology Of Pantoea Speciesmentioning

confidence: 99%

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Associations of Pantoea with Rice Plants: As Friends or Foes?

et al. 2021

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Pantoea species are gram-negative bacteria from the Enterobacteriaceae family, generally associated with plants, either as epiphytes or as pathogens. In the last decade, Pantoea species are being regarded as re-emerging pathogens that are the causal agents of various diseases in rice plants. Inherently, they are also known to be opportunistic plant symbionts having the capacity to enhance systemic resistance and increase the yield of rice plants. It is unclear how they can express both beneficial and pathogenic traits, and what factors influence and determine the outcome of a particular Pantoea–rice plant interaction. This review aims to compare the characteristics of rice plant-beneficial and pathogenic strains belonging to the Pantoea species and gain new insights, enabling distinction among the two types of plant–microbe interactions.

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Section: Detrimental Impacts Of Pantoea-rice Plant Interactions Leading To Rice Diseasessupporting

confidence: 65%

Section: Classification and Biology Of Pantoea Speciesmentioning

confidence: 99%

Associations of Pantoea with Rice Plants: As Friends or Foes?

et al. 2021

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“…On the other hand, we summarized the physiological and biochemical properties of three major pathogenic Pantoea spp. in rice plants [ 5 , 8 , 72 , 115 , 119 ], which can be used to detect and differentiate Pantoea species associated with rice diseases. Results showed positive reactions towards hydrolysis of starch and catalase, and negative reactions for oxidase reaction and hydrogen sulphide production.…”

Section: Detection and Differentiation Of Pantoea Sppmentioning

confidence: 99%

“…The Pantoea is defined as aerobic or facultative anaerobic, gram-negative, rod-shaped bacteria, which are typically motile by virtue of peritrichous flagella [ 2 , 5 ]. Bacteria belonging to the genus showed positive reactions for catalase, gelatin and starch hydrolysis tests [ 6 , 7 , 8 ], and are able to produce acid from the four carbon sources, including trehalose, palatinose, maltose and L-arabinose [ 9 ], but exhibited negative reactions for test of citrate utilization, nitrate, arginine dihydrolase, oxidation and sorbitol fermentation [ 5 , 10 , 11 , 12 , 13 , 14 ]. Colonies on nutrient agar medium were circular, smooth, mucoid convex with clear edges and yellow after 24 h of incubation at 28 °C [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Beneficial Effect and Potential Risk of Pantoea on Rice Production

Luo²,

Zaki

et al. 2022

Plants

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Bacteria from the genus Pantoea have been reported to be widely distributed in rice paddy environments with contradictory roles. Some strains promoted rice growth and protected rice from pathogen infection or abiotic stress, but other strain exhibited virulence to rice, even causing severe rice disease. In order to effectively utilize Pantoea in rice production, this paper analyzed the mechanisms underlying beneficial and harmful effects of Pantoea on rice growth. The beneficial effect of Pantoea on rice plants includes growth promotion, abiotic alleviation and disease inhibition. The growth promotion may be mainly attributed to nitrogen-fixation, phosphate solubilization, plant physiological change, the biosynthesis of siderophores, exopolysaccharides, 1-aminocyclopropane-1-carboxylic acid deaminase and phytohormones, including cytokinin, indole-3-acetic acid (IAA), auxins, abscisic acid and gibberellic acid, while the disease inhibition may be mainly due to the induced resistance, nutrient and spatial competition, as well as the production of a variety of antibiotics. The pathogenic mechanism of Pantoea can be mainly attributed to bacterial motility, production of phytohormones such as IAA, quorum sensing-related signal molecules and a series of cell wall-degrading enzymes, while the pathogenicity-related genes of Pantoea include genes encoding plasmids, such as the pPATH plasmid, the hypersensitive response and pathogenicity system, as well as various types of secretion systems, such as T3SS and T6SS. In addition, the existing scientific problems in this field were discussed and future research prospects were proposed.

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“…The impact of leaf blight on rice farming systems is likely to increase, with output losses of up to 70% in some regions (IRRI, 2019). Bacteria belonging to the genus Pantoea have been documented to cause leaf blight disease in various rice-growing regions worldwide (Lee et al, 2010;Mondal et al, 2011;González et al, 2015;Azizi et al, 2019aAzizi et al, , 2019bToh et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

The effect of lactic acid fermentation of Bactronophorus thoracites on antimicrobial activity against rice pathogens

Jamal¹,

Muhialdin²,

Saidi³

et al. 2022

MJM

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Aims: Leaf blight disease caused by Pantoea spp. reduces rice yields in numerous nations. However, the exact strategy to combat Pantoea spp. has yet to be determined. Bactronophorus thoracites is a promising source of natural antimicrobial agents due to their potential as a substrate to generate peptides with high antimicrobial activity. This study determined the effects of lactic acid fermentation using Lactobacillus casei ATCC334 as a starter culture on antimicrobial activity against rice pathogens, proximate composition, and amino acid profiles from B. thoracites crude extract. Methodology and results: Bactronophorus thoracites was washed and deshelled to collect the flesh and homogenised at 4 °C before freeze-drying. The freeze-dried samples were fermented with L. casei for 4 to 8 days at 37 °C. The antimicrobial activity, MIC and MBC were determined using a spectrometer. The fermented protein was subjected to proximate and amino acid analyses. The antimicrobial activity of fermented B. thoracites protein (FBTP) was significantly (p<0.05) decreased with the increased fermentation days (from 4 to 8 days). The antimicrobial activity was also increased when the glucose concentration increased from 2% to 3%. However, raising the glucose concentration to 4% decreased the antimicrobial activity. The antimicrobial activity was significantly (p<0.05) increased when the substratewater (S/W) ratio increased from 0.84% to 0.96%. The FBTP (4 days, 3% glucose concentration and 0.96% S/W ratio) showed high antimicrobial activity against Pantoea ananatis and P. stewartii. The MIC and MBC values for FBTP were 500 µg/mL and 250 µg/mL against P. ananatis and P. stewartii. The zones of inhibition value for FBTP were 16.0 ± 0.5 mm (1000 µg/mL) and 9.33 ± 0.57 mm (500 µg/mL) for P. ananatis, and 11.7 ± 0.61 mm (1000 µg/mL), 9.33 ± 0.58 mm (500 µg/mL) and 7.17 ± 0.77 mm (250 µg/mL) for P. stewartii. The proximate composition and amino acid profiles of the freeze-dried protein hydrolysate powder were characterised. FBTP produced a higher value of protein (61.56%) and ash (32.38%) and a lower value of total fat (0.273%) and carbohydrates (6.27%) than the B. thoracites crude extract. Total amino acid content was 39.480 g/100 g in B. thoracites crude extract and 155.442 g/100 g in FBTP. The essential amino acid glutamine was the most abundant in B. thoracites crude extract and methionine in FBTP. Conclusion, significance and impact of study:This study showed that lactic acid fermentation could produce FBTP using L. casei with improved functional characteristics and as a source of a natural antimicrobial agent against rice pathogens.

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First Report of Pantoea stewartii subsp. indologenes Causing Leaf Blight on Rice in Malaysia

Cited by 19 publications

References 4 publications

Associations of Pantoea with Rice Plants: As Friends or Foes?

Associations of Pantoea with Rice Plants: As Friends or Foes?

Beneficial Effect and Potential Risk of Pantoea on Rice Production

The effect of lactic acid fermentation of Bactronophorus thoracites on antimicrobial activity against rice pathogens

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