Storage Diseases of Sweet Potato (Ipomoea Batatas L.) in Kenya

Kihurani, A W; Gatumbi, R.W.; Skoglund, Linnea G.

doi:10.17660/actahortic.1994.380.94

Cited by 2 publications

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“…Lui et al [ 17 ] observed reduced mycelial growth and low lesion expansion potential at a temperature of less than 12 °C. Reduced pathogenicity indicates the virulence or aggressiveness may be very nominal under reduced temperatures [ 49 ]. Olson et al [ 50 ] reported that the pathogenicity of the Pythium species in infected snap beans from pod to seedling stage differed.…”

Section: Resultsmentioning

confidence: 99%

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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Section: Resultsmentioning

confidence: 99%

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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“…Several F. solani isolates were recovered from Ipomoea batatas affected by root rot [42], and S. sclerotiorum was also isolated from sweet potato showing white rot symptoms [43]. Grey mold of sweet potato tubers during storage caused by Botrytis cinerea [44], leaf and stem blight caused by A. solani [45], and anthracnose caused by Colletotrichum [46] are known from the literature. We also evaluated the BCI values against further filamentous fungi that are not known as pathogens of sweet potato to investigate the potential applica-bility of the selected strains against pathogens of other crops.…”

Section: Discussionmentioning

confidence: 99%

Development of a Multicomponent Microbiological Soil Inoculant and Its Performance in Sweet Potato Cultivation

et al. 2023

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The cultivation and consumption of sweet potato (Ipomoea batatas) are increasing globally. As the usage of chemical fertilizers and pest control agents during its cultivation may lead to soil, water and air pollution, there is an emerging need for environment-friendly, biological solutions enabling increased amounts of healthy crop and efficient disease management. Microbiological agents for agricultural purposes gained increasing importance in the past few decades. Our goal was to develop an agricultural soil inoculant from multiple microorganisms and test its application potential in sweet potato cultivation. Two Trichoderma strains were selected: Trichoderma ghanense strain SZMC 25217 based on its extracellular enzyme activities for the biodegradation of plant residues, and Trichoderma afroharzianum strain SZMC 25231 for biocontrol purposes against fungal plant pathogens. The Bacillus velezensis strain SZMC 24986 proved to be the best growth inhibitor of most of the nine tested strains of fungal species known as plant pathogens, therefore it was also selected for biocontrol purposes against fungal plant pathogens. Arthrobacter globiformis strain SZMC 25081, showing the fastest growth on nitrogen-free medium, was selected as a component with possible nitrogen-fixing potential. A Pseudomonas resinovorans strain, SZMC 25872, was selected for its ability to produce indole-3-acetic acid, which is among the important traits of potential plant growth-promoting rhizobacteria (PGPR). A series of experiments were performed to test the selected strains for their tolerance to abiotic stress factors such as pH, temperature, water activity and fungicides, influencing the survivability in agricultural environments. The selected strains were used to treat sweet potato in two separate field experiments. Yield increase was observed for the plants treated with the selected microbial consortium (synthetic community) in comparison with the control group in both cases. Our results suggest that the developed microbial inoculant has the potential to be used in sweet potato plantations. To the best of our knowledge, this is the first report about the successful application of a fungal-bacterial consortium in sweet potato cultivation.

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Storage Diseases of Sweet Potato (Ipomoea Batatas L.) in Kenya

Cited by 2 publications

References 0 publications

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

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

Development of a Multicomponent Microbiological Soil Inoculant and Its Performance in Sweet Potato Cultivation

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