ANAC055 and ANAC092 contribute non-redundantly in an EIN2-dependent manner to Age-Related Resistance in Arabidopsis

Al-Daoud, Fadi; Cameron, Robin K.

doi:10.1016/j.pmpp.2011.09.003

Cited by 20 publications

(15 citation statements)

References 84 publications

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“…Moreover, these mutants support a higher level of hemibiotrophic pathogens, such as Pst DC3000. The overexpression of these genes confers plant resistance against Pst DC3000, but susceptibility to the necrotrophic pathogens, such as B. cinerea [42][43][44][45]. ORE1 has been shown to mediate PCD via directly targeting and activating a senescence-enhanced gene BIFUNCTIONAL NUCLEASE 1 (BFN1), which is associated with PCD [46].…”

Section: Nac Tfsmentioning

confidence: 99%

Genetic Network between Leaf Senescence and Plant Immunity: Crucial Regulatory Nodes and New Insights

Zhang

Wang

et al. 2020

Plants

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Leaf senescence is an essential physiological process that is accompanied by the remobilization of nutrients from senescent leaves to young leaves or other developing organs. Although leaf senescence is a genetically programmed process, it can be induced by a wide variety of biotic and abiotic factors. Accumulating studies demonstrate that senescence-associated transcription factors (Sen-TFs) play key regulatory roles in controlling the initiation and progression of leaf senescence process. Interestingly, recent functional studies also reveal that a number of Sen-TFs function as positive or negative regulators of plant immunity. Moreover, the plant hormone salicylic acid (SA) and reactive oxygen species (ROS) have been demonstrated to be key signaling molecules in regulating leaf senescence and plant immunity, suggesting that these two processes share similar or common regulatory networks. However, the interactions between leaf senescence and plant immunity did not attract sufficient attention to plant scientists. Here, we review the regulatory roles of SA and ROS in biotic and abiotic stresses, as well as the cross-talks between SA/ROS and other hormones in leaf senescence and plant immunity, summarize the transcriptional controls of Sen-TFs on SA and ROS signal pathways, and analyze the cross-regulation between senescence and immunity through a broad literature survey. In-depth understandings of the cross-regulatory mechanisms between leaf senescence and plant immunity will facilitate the cultivation of high-yield and disease-resistant crops through a molecular breeding strategy.

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Section: Nac Tfsmentioning

confidence: 99%

Genetic Network between Leaf Senescence and Plant Immunity: Crucial Regulatory Nodes and New Insights

Zhang

Wang

et al. 2020

Plants

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“…For example, SENESCENCE‐ASSOCIATED GENE101 ( SAG101 ), initially isolated as a positive regulator of leaf senescence, contributes to a disease resistance pathway in conjunction with PAD4 (Zhu et al ). The leaf senescence‐delayed mutants oresara1 ( ore1 ), ore3 and ore9 also exhibit attenuated defense responses (Bent et al , Carviel et al , Al‐Daoud and Cameron , Piisila et al ). Conversely, several defense response mutants exhibit altered senescence phenotypes.…”

Section: Introductionmentioning

confidence: 99%

NORE1/SAUL1 integrates temperature‐dependent defense programs involving SGT1b and PAD4 pathways and leaf senescence in Arabidopsis

Lee

Kim

et al. 2016

Physiologia Plantarum

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Leaf senescence is not only primarily governed by developmental age but also influenced by various internal and external factors. Although some genes that control leaf senescence have been identified, the detailed regulatory mechanisms underlying integration of diverse senescence-associated signals into the senescence programs remain to be elucidated. To dissect the regulatory pathways involved in leaf senescence, we isolated the not oresara1-1 (nore1-1) mutant showing accelerated leaf senescence phenotypes from an EMS-mutagenized Arabidopsis thaliana population. We found that altered transcriptional programs in defense response-related processes were associated with the accelerated leaf senescence phenotypes observed in nore1-1 through microarray analysis. The nore1-1 mutation activated defense program, leading to enhanced disease resistance. Intriguingly, high ambient temperature effectively suppresses the early senescence and death phenotypes of nore1-1. The gene responsible for the phenotypes of nore1-1 contains a missense mutation in SENESCENCE-ASSOCIATED E3 UBIQUITIN LIGASE 1 (SAUL1), which was reported as a negative regulator of premature senescence in the light intensity- and PHYTOALEXIN DEFICIENT 4 (PAD4)-dependent manner. Through extensive double mutant analyses, we recently identified suppressor of the G2 Allele of SKP1b (SGT1b), one of the positive regulators for disease resistance conferred by many resistance (R) proteins, as a downstream signaling component in NORE1-mediated senescence and cell death pathways. In conclusion, NORE1/SAUL1 is a key factor integrating signals from temperature-dependent defense programs and leaf senescence in Arabidopsis. These findings provide a new insight that plants might utilize defense response program in regulating leaf senescence process, possibly through recruiting the related genes during the evolution of the leaf senescence program.

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“…In many plant-pathogen interactions, the degree of resistance depends on the genotype, growth stage, and leaf age of the host plant (Dolar, 1997;Turechek and Stevenson, 1998;Chang and Hwang 2003;Visker et al, 2003;Rodriguez et al, 2006;Basandrai et al, 2007;Develey-Rivïere and Galiana, 2007;Coelho and Valério, 2009). The difference in resistance to pathogens according to tissue age is age-related resistance (ARR) (Kus et al, 2002;Zeier, 2005;Ando et al, 2009;Al-Daoud and Cameron, 2011). Many previous studies reported that the resistance to chocolate spot disease is affected by the development of FB plant.…”

Section: Introductionmentioning

confidence: 99%

Resistance/susceptibility of Faba Bean to Botrytis fabae: The Causal Agent of Chocolate Spot with Respect to Leaf Position

Mahmoud¹,

El-Komy²,

Saleh³

et al. 2015

IJAB

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Plants have evolved different defense mechanisms to combat pathogen attacks. In this study, detached leaf assays were conducted to estimate the influence of leaf position (leaf age) on the development of chocolate spot disease, caused by Botrytis fabae, in the lower, middle and upper leaves of five faba bean (FB) cultivars with different levels of resistance/susceptibility. Two components of resistance in terms of lesion diameter and spores per lesion were used to evaluate the disease intensity. To evaluate plant defense response, oxidative burst and phenol-oxidizing enzymes were assayed. The results indicated that regardless of the resistance level of the FB cultivar, lower (older) leaves were more severely infected by the chocolate spot pathogen than upper (younger) ones. A comparison of the defense-response behavior of the FB leaves revealed that the chocolate spot pathogen induced lipid peroxidation and the production of reactive oxygen species, peroxidase, and polyphenol oxidase in leaf tissue during the FB-B. fabae interaction. The production of these defense compounds in leaves was not static but governed in time and extent by physiological maturity. Younger leaves exhibited significantly higher oxidizing enzyme activity and lower oxidative stress than older ones. These variations in the levels of defense compounds could explain the differences in leaf resistance. The extreme differences in disease development recorded in upper and lower leaves of all FB cultivars suggest that assessing resistance using leaves from the middle positions would be the most efficient and reliable for evaluating the resistance/susceptibility of FB plants to B. fabae.

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ANAC055 and ANAC092 contribute non-redundantly in an EIN2-dependent manner to Age-Related Resistance in Arabidopsis

Cited by 20 publications

References 84 publications

Genetic Network between Leaf Senescence and Plant Immunity: Crucial Regulatory Nodes and New Insights

Genetic Network between Leaf Senescence and Plant Immunity: Crucial Regulatory Nodes and New Insights

NORE1/SAUL1 integrates temperature‐dependent defense programs involving SGT1b and PAD4 pathways and leaf senescence in Arabidopsis

Resistance/susceptibility of Faba Bean to Botrytis fabae: The Causal Agent of Chocolate Spot with Respect to Leaf Position

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