Differentiation of Races of Pseudomonas solanacearum by a Leaf Infiltration Technique

Lozano, J. C.

doi:10.1094/phyto-60-833

Cited by 94 publications

(55 citation statements)

References 3 publications

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“…A light-dependent nature of distinct plant defense responses has been established by several laboratories (Lozano and Sequeira, 1970;Guo et al, 1993;Genoud et al, 2002;Zeier et al, 2004;Bechtold et al, 2005;Chandra-Shekara et al, 2006). In Psm avrRpm1-inoculated Col-0 leaves, we have observed that SA accumulation, expression of PAL1 and PR-1, as well as HR cell death are compromised in continuous darkness, whereas camalexin production, JA accumulation, and expression of GST1 are not negatively affected.…”

Section: Cross Talk Of Photoreceptor Signaling and Plant Defensementioning

confidence: 57%

“…Light is the major external factor influencing plant growth and development, and an appropriate light environment is also required for the establishment of a complete set of resistance responses in several plant-pathogen interactions (Roberts and Paul, 2006). In tobacco (Nicotiana tabacum), rice (Oryza sativa), and Arabidopsis (Arabidopsis thaliana), HR-associated programmed cell death triggered by bacterial and viral pathogens is light dependent (Lozano and Sequeira, 1970;Guo et al, 1993;Genoud et al, 2002;Zeier et al, 2004;Chandra-Shekara et al, 2006). Similarly, the constitutive cell death phenotype of Arabidopsis acd11 and lsd1 mutants is only evident when light of a certain quantity or duration is present (Brodersen et al, 2002;Mateo et al, 2004).…”

mentioning

confidence: 99%

“…Thus, lightcontrolled activation of these responses can explain why resistance of plants to many bacterial and viral pathogens is attenuated in the dark (Lozano and Sequeira, 1970;Guo et al, 1993;Genoud et al, 2002;Zeier et al, 2004;Chandra-Shekara et al, 2006). It is noteworthy, however, that several inducible plant defenses occurring at sites of pathogen inoculation do not require the presence of light.…”

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confidence: 99%

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Light Regulation and Daytime Dependency of Inducible Plant Defenses in Arabidopsis: Phytochrome Signaling Controls Systemic Acquired Resistance Rather Than Local Defense

2008

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We have examined molecular and physiological principles underlying the light dependency of defense activation in Arabidopsis (Arabidopsis thaliana) plants challenged with the bacterial pathogen Pseudomonas syringae. Within a fixed light/dark cycle, plant defense responses and disease resistance significantly depend on the time of day when pathogen contact takes place. Morning and midday inoculations result in higher salicylic acid accumulation, faster expression of pathogenesis-related genes, and a more pronounced hypersensitive response than inoculations in the evening or at night. Rather than to the plants' circadian rhythm, this increased plant defense capability upon day inoculations is attributable to the availability of a prolonged light period during the early plant-pathogen interaction. Moreover, pathogen responses of Arabidopsis double mutants affected in light perception, i.e. cryptochrome1cryptochrome2 (cry1cry2), phototropin1phototropin2 (phot1phot2), and phytochromeAphytochromeB (phyAphyB) were assessed. Induction of defense responses by either avirulent or virulent P. syringae at inoculation sites is relatively robust in leaves of photoreceptor mutants, indicating little cross talk between local defense and light signaling. In addition, the blue-light receptor mutants cry1cry2 and phot1phot2 are both capable of establishing a full systemic acquired resistance (SAR) response. Induction of SAR and salicylic-acid-dependent systemic defense reactions, however, are compromised in phyAphyB mutants. Phytochrome regulation of SAR involves the essential SAR component FLAVIN-DEPENDENT MONOOXYGENASE1. Our findings highlight the importance of phytochrome photoperception during systemic rather than local resistance induction. The phytochrome system seems to accommodate the supply of light energy to the energetically costly increase in whole plant resistance.

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Section: Cross Talk Of Photoreceptor Signaling and Plant Defensementioning

confidence: 57%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Light Regulation and Daytime Dependency of Inducible Plant Defenses in Arabidopsis: Phytochrome Signaling Controls Systemic Acquired Resistance Rather Than Local Defense

2008

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“…Light has long been known to be required for a full defense response in plants, as attenuated responses to a range of viral, bacterial, and fungal pathogens have often been observed in the dark (Lozano and Sequeira, 1970;Guo et al, 1993;Genoud et al, 2002;Zeier et al, 2004;Chandra-Shekara et al, 2006). While some plant defense responses occur independently of light, such as camalexin biosynthesis and jasmonic acid production (Zeier et al, 2004), light has been shown to play a particularly important role in salicylic acid (SA)-mediated defense responses.…”

Section: The Role Of Light In the Host Defense Responsementioning

confidence: 99%

Lights, Rhythms, Infection: The Role of Light and the Circadian Clock in Determining the Outcome of Plant–Pathogen Interactions

2009

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The importance of light with respect to the outcome of plant-pathogen interactions is becoming increasingly evident: light affects both the host response and the virulence of some pathogens. The response of plants to environmental signals and stresses is modulated by the circadian clock, and it is apparent that this may include immune responses. Photo and temporal regulation of immune responses may allow plants to anticipate and react more effectively to particular pathogen infections. These aspects of regulation are sometimes overlooked when designing experiments to understand plantpathogen interactions, complicating the interpretation of the outcomes and the direct comparisons of studies. We review recent key findings in these areas and discuss the implications for experimental design and analyses.

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“…As discussed above, a direct relationship between light perception and pathogen virulence has been established. In fact, without light, plants are unable to mount a proper defense response to pathogens (Guo et al, 1993;Lozano and Sequeira, 1970). Recently, progress has been made in model plants to better understand the role of light in regulating a complex network of signaling pathways in response to pathogen invasion (Roden and Ingle, 2009).…”

Section: Potential Roles Of Light In Host Defense Against C Zeaemaydismentioning

confidence: 99%

Regulation of Pathogenesis by Light in Cercospora zeae-maydis: An Updated Perspective

Kim¹,

Ridenour²,

Dunkle³

et al. 2011

The Plant Pathology Journal

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The fungal genus Cercospora is one of the most ubiquitous groups of plant pathogenic fungi, and gray leaf spot caused by C. zeae-maydis is one of the most widespread and damaging foliar diseases of maize in the world. While light has been implicated as a critical environmental regulator of pathogenesis in C. zeae-maydis, the relationship between light and the development of disease is not fully understood. Recent discoveries have provided new insights into how light influences pathogenesis and morphogenesis in C. zeae-maydis, particularly at the molecular level. This review is focused on integrating old and new information to provide an updated perspective of how light influences pathogenesis, and provides a working model to explain some of the underlying molecular mechanisms. Ultimately, a thorough molecular-level understanding of how light regulates pathogenesis will augment efforts to manage gray leaf spot by improving host resistance and disease management strategies.

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Differentiation of Races of Pseudomonas solanacearum by a Leaf Infiltration Technique

Cited by 94 publications

References 3 publications

Light Regulation and Daytime Dependency of Inducible Plant Defenses in Arabidopsis: Phytochrome Signaling Controls Systemic Acquired Resistance Rather Than Local Defense

Light Regulation and Daytime Dependency of Inducible Plant Defenses in Arabidopsis: Phytochrome Signaling Controls Systemic Acquired Resistance Rather Than Local Defense

Lights, Rhythms, Infection: The Role of Light and the Circadian Clock in Determining the Outcome of Plant–Pathogen Interactions

Regulation of Pathogenesis by Light in Cercospora zeae-maydis: An Updated Perspective

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