Evidence for a transmissible factor that causes rapid stomatal closure in soybean at sites adjacent to and remote from hypersensitive cell death induced by Phytophthora sojae

McDonald, Kerrie L.; Cahill, David M.

doi:10.1006/pmpp.1999.0220

Cited by 27 publications

(16 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We have shown that lettuce is able to mount stomatal immunity against bacteria similar to what has been observed in other plants such as Arabidopsis, tomato, tobacco, soybean, and common beans (11, 19, 22, 24). These results reinforce the notion that stomatal immunity is a widespread mechanism of defense among plants extending to both plant and human pathogens.…”

Section: Discussionsupporting

confidence: 77%

Escherichia coli O157:H7 Induces Stronger Plant Immunity than Salmonella enterica Typhimurium SL1344

Roy¹,

Panchal²,

Rosa³

et al. 2013

Phytopathology®

View full text Add to dashboard Cite

Consumption of fresh produce contaminated with bacterial human pathogens has resulted in various, sometimes deadly, disease outbreaks. In this study, we assessed plant defense responses induced by the fully pathogenic bacteria Escherichia coli O157:H7 and Salmonella enterica serovar Typhimurium SL1344 in both Arabidopsis thaliana and lettuce (Lactuca sativa). Unlike SL1344, O157:H7 induced strong plant immunity at both pre-invasion and post-invasion steps of infection. For instance, O157:H7 triggered stomatal closure even under high relative humidity (RH); an environmental condition that generally weakens plant defenses against bacteria in the field and laboratory conditions. SL1344 instead induced a transient stomatal immunity. We also observed that PR1 gene expression was significantly higher in Arabidopsis leaves infected with O157:H7 as compared to SL1344. These results suggest that plants may recognize and respond to some human pathogens more effectively than others. Furthermore, stomatal immunity can diminish the penetration of human pathogens through the leaf epidermis resulting in low bacterial titers in the plant apoplast suggesting that additional control measures can be employed to prevent food contamination. The understanding of how plant responses can diminish bacterial contamination is paramount in preventing outbreaks and improving the safety of food supplies.

show abstract

Section: Discussionsupporting

confidence: 77%

Escherichia coli O157:H7 Induces Stronger Plant Immunity than Salmonella enterica Typhimurium SL1344

Roy¹,

Panchal²,

Rosa³

et al. 2013

Phytopathology®

View full text Add to dashboard Cite

show abstract

“…syringae (Di Giorgio et al 1996) and Phytophthora sojae (McDonald and Cahill 1999), which rapidly reduce host transpiration, V. inaequalis is not known to produce toxic metabolites that may affect stomatal conductivity directly. The pathogen, however, induces a transpiration sink to divert plant solutes (Hignett and Kirkham 1967) to the subcuticular space for its own growth.…”

Section: Discussionmentioning

confidence: 98%

Thermographic assessment of scab disease on apple leaves

2010

View full text Add to dashboard Cite

Phytopathogenic fungi may affect both the cuticular and the stomatal conductance of plant tissue resulting in significant modifications of leaf temperature. Venturia inaequalis colonizes apple leaves below the cuticle (subcuticularly) causing scab disease. The suitability of digital infrared thermography for sensing and quantifying apple scab was assessed by investigating the effects of V. inaequalis on the water balance of apple leaves in relation to the disease stage and the severity of scab. Transpiration was measured by infrared thermo-imaging to evaluate spatial heterogeneity of the leaves in response to localized infections. Fungal development was assessed microscopically. Subcuticular growth of the pathogen caused localized decreases in leaf temperature before symptoms appeared that significantly increased the maximum temperature difference (MTD) of leaves. The MTD increased with scab development and was strongly correlated to the size of infection sites (r 2 linear = 0.85) and overall disease severity (% diseased leaf area, r 2 square = 0.71). In later stages of the disease, the MTD decreased because of leaf senescence. Thermographic measurements revealed differences in disease severity resulting from disease stage, resistance of host tissue and differences in the aggressiveness of V. inaequalis isolates. Subcuticular growth of the pathogen was beyond the area of conidia production, therefore, the area of leaf with increased transpiration was larger than the scab lesions; the proportion decreased from [70% in the early stages to \20% for mature lesions. Leaf transpiration was increased by all stages of scab development, therefore, MTD may be used not only for the differentiation between diseased and non-diseased leaves, but also for disease quantification, e.g. in screening systems and monitoring in precision agriculture.

show abstract

“…The different leaf temperature after inoculation may due to the different abscisic acid (ABA) content in response to the different N forms and supplies [46]. Generally, pathogen infection can induce stomatal closure [47,48], which is mediated by ABA content [7,49], thus decreasing the transpiration rate and increasing the leaf temperature [50,51]. …”

Section: Discussionmentioning

confidence: 99%

Nitrate Increased Cucumber Tolerance to Fusarium Wilt by Regulating Fungal Toxin Production and Distribution

Zhou

Wang

Sun

et al. 2017

Toxins

View full text Add to dashboard Cite

Cucumber Fusarium wilt, induced by Fusarium oxysporum f. sp. cucumerinum (FOC), causes severe losses in cucumber yield and quality. Nitrogen (N), as the most important mineral nutrient for plants, plays a critical role in plant–pathogen interactions. Hydroponic assays were conducted to investigate the effects of different N forms (NH4+ vs. NO3‒) and supply levels (low, 1 mM; high, 5 mM) on cucumber Fusarium wilt. The NO3‒-fed cucumber plants were more tolerant to Fusarium wilt compared with NH4+-fed plants, and accompanied by lower leaf temperature after FOC infection. The disease index decreased as the NO3‒ supply increased but increased with the NH4+ level supplied. Although the FOC grew better under high NO3− in vitro, FOC colonization and fusaric acid (FA) production decreased in cucumber plants under high NO3− supply, associated with lower leaf membrane injury. There was a positive correlation between the FA content and the FOC number or relative membrane injury. After the exogenous application of FA, less FA accumulated in the leaves under NO3− feeding, accompanied with a lower leaf membrane injury. In conclusion, higher NO3− supply protected cucumber plants against Fusarium wilt by suppressing FOC colonization and FA production in plants, and increasing the plant tolerance to FA.

show abstract

Evidence for a transmissible factor that causes rapid stomatal closure in soybean at sites adjacent to and remote from hypersensitive cell death induced by Phytophthora sojae

Cited by 27 publications

References 27 publications

Escherichia coli O157:H7 Induces Stronger Plant Immunity than Salmonella enterica Typhimurium SL1344

Escherichia coli O157:H7 Induces Stronger Plant Immunity than Salmonella enterica Typhimurium SL1344

Thermographic assessment of scab disease on apple leaves

Nitrate Increased Cucumber Tolerance to Fusarium Wilt by Regulating Fungal Toxin Production and Distribution

Contact Info

Product

Resources

About