Interactions of air temperature, relative humidity and biological control agents on grey mold of bean

Hannusch, D. J.; Boland, G. J.

doi:10.1007/bf01877100

Cited by 45 publications

(20 citation statements)

References 18 publications

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“…The lesion diameter of P. italicum dropped with decreasing temperature and RH values with a maximum growth at 25°C and 100% RH, and no growth detected at 35°C (data not shown) regardless of the RH value. This result is in concordance with those of Lahlali et al (2006) and Plaza et al (2003) and that reported on B. cinerea (Hannusch and Boland, 1996). The study of strain Z1 cell survival in wounded citrus fruits demonstrated a good adaptation of this BCA to cold storage temperatures.…”

Section: Discussionsupporting

confidence: 92%

Efficacy assessment of Pichia guilliermondii strain Z1, a new biocontrol agent, against citrus blue mould in Morocco under the influence of temperature and relative humidity

et al. 2011

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a b s t r a c tThe interactions of Penicillium italicum, which causes blue mould, and antagonistic yeast Pichia guilliermondii strain Z1 were examined in controlled environments, to determine the influence of relative humidity (RH) (45%, 75%, 85%, 98%, and 100%) and temperature (T) (5, 10, 15, 20, and 25°C). All main effects and interactions were significant (P 6 0.05), with the exception of interactions RHÂT and strain Z1 (BCA)ÂRHÂT. In the pathogen control, the lesion diameter of blue mould developed under all environmental conditions but was the largest at a RH range between 98% and 100%, independent of the temperature. The efficacy of strain Z1 appeared to be independent of the environment and reduced disease incidence by more than 85% in all environmental conditions. Rapid colonization of the antagonistic yeast strain Z1 on citrus wounded sites was recorded during the first week at 5°C. Colonization then stabilized at ±6.9 Â 10 6 CFU/ml for 30 days. This indicates that P. guilliermondii is able to adapt itself and colonize the wound sites prior to the arrival of the pathogen, displaying greater efficiency than when colonizing wounds after pathogen. The antagonist was capable of growing in low concentrations of orange juice (0.1-5%), with greatest growth at 5%. Applying strain Z1 (1 Â 10 8 CFU/ml) as a formulated product significantly reduced the incidence of infected fruits and the percentage of infected wounds relative to the pathogen control. Disease control with formulated product (45%) was slightly lower than that obtained with thiabendazole (20%) or strain Z1 culturable cells (25%). These results suggest that strain Z1 may be a useful BCA for control of blue mould under varying environmental conditions, and control may be enhanced by combining with other eco-friendly post-harvest treatments or improved formulation.

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Section: Discussionsupporting

confidence: 92%

Efficacy assessment of Pichia guilliermondii strain Z1, a new biocontrol agent, against citrus blue mould in Morocco under the influence of temperature and relative humidity

et al. 2011

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“…And one of the major problems with applications of biological control for plant disease management in the field has been the vulnerability of biocontrol agent populations to environmental variation and environmental extremes (59,147). If appropriate temperature and moisture are not consistently available, biocontrol agent populations may reach densities that are too small to have important effects, and may not recover as rapidly as pathogen populations when conducive conditions recur (57,61).…”

Section: Plant Disease Managementmentioning

confidence: 99%

Climate Change Effects on Plant Disease: Genomes to Ecosystems

Garrett

Dendy

Frank

et al. 2006

Annu. Rev. Phytopathol.

815

536

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Research in the effects of climate change on plant disease continues to be limited, but some striking progress has been made. At the genomic level, advances in technologies for the high-throughput analysis of gene expression have made it possible to begin discriminating responses to different biotic and abiotic stressors and potential trade-offs in responses. At the scale of the individual plant, enough experiments have been performed to begin synthesizing the effects of climate variables on infection rates, though pathosystemspecific characteristics make synthesis challenging. Models of plant disease have now been developed to incorporate more sophisticated climate predictions. At the population level, the adaptive potential of plant and pathogen populations may prove to be one of the most important predictors of the magnitude of climate change effects. Ecosystem ecologists are now addressing the role of plant disease in ecosystem processes and the challenge of scaling up from individual infection probabilities to epidemics and broader impacts.

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“…Electronic mail: ldong@iastate.edu and growth and studying interactions between plants and biological species (e.g., microbes, pathogens, and pests). 4 Current greenhouse and growth chamber technologies require sensors and computer-assisted water spray and air ventilation to obtain specified humidity levels. 5,6 Air humidity-regulating control of commercial plant growth environments is often obtained by combining humidifier and dehumidifier.…”

Section: Introductionmentioning

confidence: 99%

Humidity assay for studying plant-pathogen interactions in miniature controlled discrete humidity environments with good throughput

Jiang

Sahu

et al. 2016

Biomicrofluidics

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This paper reports a highly economical and accessible approach to generate different discrete relative humidity conditions in spatially separated wells of a modified multi-well plate for humidity assay of plant-pathogen interactions with good throughput. We demonstrated that a discrete humidity gradient could be formed within a few minutes and maintained over a period of a few days inside the device. The device consisted of a freeway channel in the top layer, multiple compartmented wells in the bottom layer, a water source, and a drying agent source. The combinational effects of evaporation, diffusion, and convection were synergized to establish the stable discrete humidity gradient. The device was employed to study visible and molecular disease phenotypes of soybean in responses to infection by Phytophthora sojae, an oomycete pathogen, under a set of humidity conditions, with two near-isogenic soybean lines, Williams and Williams 82, that differ for a Phytophthora resistance gene (Rps1-k). Our result showed that at 63% relative humidity, the transcript level of the defense gene GmPR1 was at minimum in the susceptible soybean line Williams and at maximal level in the resistant line Williams 82 following P. sojae CC5C infection. In addition, we investigated the effects of environmental temperature, dimensional and geometrical parameters, and other configurational factors on the ability of the device to generate miniature humidity environments. This work represents an exploratory effort to economically and efficiently manipulate humidity environments in a space-limited device and shows a great potential to facilitate humidity assay of plant seed germination and development, pathogen growth, and plant-pathogen interactions. Since the proposed device can be easily made, modified, and operated, it is believed that this present humidity manipulation technology will benefit many laboratories in the area of seed science, plant pathology, and plant-microbe biology, where humidity is an important factor that influences plant disease infection, establishment, and development. Published by AIP Publishing. [http://dx

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Interactions of air temperature, relative humidity and biological control agents on grey mold of bean

Cited by 45 publications

References 18 publications

Efficacy assessment of Pichia guilliermondii strain Z1, a new biocontrol agent, against citrus blue mould in Morocco under the influence of temperature and relative humidity

Efficacy assessment of Pichia guilliermondii strain Z1, a new biocontrol agent, against citrus blue mould in Morocco under the influence of temperature and relative humidity

Climate Change Effects on Plant Disease: Genomes to Ecosystems

Humidity assay for studying plant-pathogen interactions in miniature controlled discrete humidity environments with good throughput

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