Models to predict potato tuber infection by Pythium ultimum from duration of wetness and temperature, and leak-lesion expansion from storage duration and temperature

Lui, Lei; Kushalappa, Ajjamada C.

doi:10.1016/s0925-5214(02)00114-x

Cited by 8 publications

(8 citation statements)

References 12 publications

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“…They can be considered as biological control agents. Some biological control agents can act directly against fungal pathogens by enzymatic degradation of their cell walls (Kamensky et al 2002;Li et al 2002), by parasitism-as it seems to be the case against numerous nematodes-(Nunez-Camargo et al. 2003;Papert et al 2004), by antibiotics production (Grosch et al 2005), by siderophore secretion that reduces the availability of iron needed by plant pathogens (Bharadwaj et al 2008) or by interfering with communication between pathogens, i.e., by degrading molecules involved in the "quorum sensing" mechanisms of Pectobacterium spp.…”

Section: Interactions Between Microorganisms Organisms and Pathogensmentioning

confidence: 99%

Potato soil-borne diseases. A review

Fiers¹,

Edel-Hermann²,

Chatot³

et al. 2011

Agron. Sustain. Dev.

139

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Potato crop is the fourth main food crop in the world and it will certainly feed a big part of the global population in the next years. The economical outlets for this crop are great; however, numerous diseases either soil-or airborne can cause huge losses in the production. Worldwide, about 40 soil-borne diseases affect potato and cause severe damages especially on tubers, the economically most important part of the plant. The occurrence and development of soilborne diseases depend on very diverse factors affecting either the pathogen or the plant. Favorable conditions for potato diseases development are frequently the same as the conditions needed for potato growth: temperature between 10°C and 25°C, high humidity, medium pH, etc. Adapted cultural practices such as a rotation longer than 4 years, appropriate fertilization and water management, an adapted delay between haulm killing and harvest, and dry and cool conditions for tuber storage are good ways to control potato diseases. In most cases, potato pathogens develop specific survival forms, dissemination ways and host penetration methods. The genetic variability of the pathogens implies the use of adapted diagnostic and control methods. Decision support systems developed to predict yield losses allow choosing good control methods such as the use of healthy seeds, adapted pesticides, cultural practices, and biological control agents for each potato disease. The complexity of the interactions between a pathogen and its host, influenced by biotic and abiotic factors of the environment, make the control of the diseases often very difficult. However, deep knowledge of pathosystems allows setting up integrated pest management systems allowing the production of healthy and good quality potatoes.

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Section: Interactions Between Microorganisms Organisms and Pathogensmentioning

confidence: 99%

Potato soil-borne diseases. A review

Fiers¹,

Edel-Hermann²,

Chatot³

et al. 2011

Agron. Sustain. Dev.

139

View full text Add to dashboard Cite

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“…In general, Pythium infections are severe at high temperatures [ 40 ], and reduced storage conditions would have slowed the rate of infection and disease development. Previous studies also reported that storage temperature and time significantly affect the lesion expansion of the leak [ 17 , 36 ].…”

Section: Resultsmentioning

confidence: 97%

“…El-Marzoky [ 46 ] also observed the lowest growth of P. ultimum isolates on PDA at 5 °C. The leak’s overall infection reduction could be the effect of the exposure of the pathogen to lower air temperature around the tuber shortly after the inoculation [ 17 , 36 ]. Storage temperatures below 18.3 °C are also reported as advantageous to limit bruise and remove field heat in typical storage designs to avoid Pythium leak infection [ 37 ].…”

Section: Resultsmentioning

confidence: 99%

“…The greatest pathogenic activity was observed in the tubers stored at room temperature. Limited infection potential at low temperature [ 17 , 36 , 51 ] resulted in limited VOC release, where the differences in FAIMS spectral patterns between control and inoculated samples were not prominent. Temporal progression of the VOCs released from the healthy control and inoculated tuber samples was captured by the Box–Whisker plots at −131 V CV and 74% DF intensity, which showed consistent differences in both the classes.…”

Section: Discussionmentioning

confidence: 99%

“…Gas chromatography–mass spectrometry (GC-MS) has been used for volatile organic compounds (VOCs) profiling to differentiate potato tubers infected with the dry and soft rot pathogens [ 17 ]. Stored potatoes infected with storage rot pathogens produce VOCs that could be proportional to the disease severity of physical damage [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

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Feasibility of Volatile Biomarker-Based Detection of Pythium Leak in Postharvest Stored Potato Tubers Using Field Asymmetric Ion Mobility Spectrometry

Kothawade

Sankaran

Bates

et al. 2020

Sensors

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The study evaluates the suitability of a field asymmetric ion mobility spectrometry (FAIMS) system for early detection of the Pythium leak disease in potato tubers simulating bulk storage conditions. Tubers of Ranger Russet (RR) and Russet Burbank (RB) cultivars were inoculated with Pythium ultimum, the causal agent of Pythium leak (with negative control samples as well) and placed in glass jars. The headspace in sampling jars was scanned using the FAIMS system at regular intervals (in days up to 14 and 31 days for the tubers stored at 25 °C and 4 °C, respectively) to acquire ion mobility current profiles representing the volatile organic compounds (VOCs). Principal component analysis plots revealed that VOCs ion peak profiles specific to Pythium ultimum were detected for the cultivars as early as one day after inoculation (DAI) at room temperature storage condition, while delayed detection was observed for tubers stored at 4 °C (RR: 5th DAI and RB: 10th DAI), possibly due to a slower disease progression at a lower temperature. There was also some overlap between control and inoculated samples at a lower temperature, which could be because of the limited volatile release. Additionally, data suggested that the RB cultivar might be less susceptible to Pythium ultimum under reduced temperature storage conditions. Disease symptom-specific critical compensation voltage (CV) and dispersion field (DF) from FAIMS responses were in the ranges of −0.58 to −2.97 V and 30–84% for the tubers stored at room temperature, and −0.31 to −2.97 V and 28–90% for reduced temperature, respectively. The ion current intensities at −1.31 V CV and 74% DF showed distinctive temporal progression associated with healthy control and infected tuber samples.

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