Methyl jasmonate alters polyamine metabolism and induces systemic protection against powdery mildew infection in barley seedlings

Walters, Dale R.; Cowley, Tracy; Mitchell, Ann D.

doi:10.1093/jexbot/53.369.747

Cited by 136 publications

(85 citation statements)

References 32 publications

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“…An addition of MeJA initiated de novo transcription of genes, such as PAL, that are known to be involved in the chemical defense mechanisms of plants (Gundlach et al, 1992). Another study in barley has found that the systemic protection provided by MeJA against Blumeria graminis accompanied significant increases in activities of PAL and POD (Walters et al, 2002). Response of MeJA-treated Norway spruce stems involves tissue-specific differentiation of traumatic resin ducts, terpenoid accumulation and induction of defense enzyme activities in the developing xylem tissues (Martin et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

Induction of phenolics, lignin and key defense enzymes in eggplant (Solanum melongena L.) roots in response to elicitors

Sudhamoy¹,

al²

2010

Afr. J. Biotechnol.

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Elicitors are capable of mimicking the perception of a pathogen by a plant, thereby triggering induction of a sophisticated defense response in plants. In this study, we investigated an induced resistance in eggplant in respect to cell wall strengthening and defense enzyme activation affected by four elicitors such as, chitosan (CHT), salicylic acid (SA), methyl salicylate (MeSA) and methyl jasmonate (MeJA). The increase in total phenolic content of eggplant roots by the elicitors was significantly higher. Lignin deposition in the cell wall of eggplant roots was increased 5, 4, 3 and 3 times by SA, CHT, MeJA and MeSA at 96 h of elicitation, respectively. Phenylalanine ammonia-lyase (PAL) activity showed an increase of 4.7, 3.7, 3.5 and 3.2 times by SA, CHT, MeJA and MeSA at 36 h of elicitation, respectively. Highest activity of peroxidase (POD) was observed at 24 h after elicitation under the precise influence of CHT and SA. The activities of polyphenol oxidase (PPO), cinnamyl alcohol dehydrogenase (CAD) and catalase (CAT) were also increased several folds by the elicitors. Accumulation of phenolics and lignin in high amounts, together with higher level activity of major defense enzymes in response to the elicitors, may bolster eggplants in mounting practical and effective resistance against Ralstonia solanacearum, the devastating wilt pathogen.

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Section: Discussionmentioning

confidence: 99%

Induction of phenolics, lignin and key defense enzymes in eggplant (Solanum melongena L.) roots in response to elicitors

Sudhamoy¹,

al²

2010

Afr. J. Biotechnol.

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“…PAL has been proven to be a key enzyme in pathogen defense and stress response [69,70]. ZB8 is a rice PAL gene and has been shown to be induced under wounding and fungal cell wall elicitor treatment [71].…”

Section: Overexpression Of Oswrky03 In Rice Leads To Induced Expressimentioning

confidence: 99%

OsWRKY03, a rice transcriptional activator that functions in defense signaling pathway upstream of OsNPR1

et al. 2005

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WRKY family proteins are a class of plant specific transcription factors that involve in many stress response pathways. It has been shown that one Arabidopsis WRKY protein, AtWRKY29/22, is activated by MAP kinase signaling cascade and confers resistance to both bacterial and fungal pathogens. However, little is known about the biological roles of WRKY proteins in rice. In this study, we investigated the expression patterns of rice AtWRKY29/22 homolog, OsWRKY03, under different conditions, and also its possible role involved in plant defense. Our results showed that OsWRKY03 was up-regulated by several defense signaling molecules or different treatments. Further analysis revealed that the expression of OsWRKY03 was light dependent. Transcriptional activation activity of OsWRKY03 was also demonstrated by yeast functional assay. Transient expression of OsWRKY03-GFP fusion protein in onion epidermis cells showed that OsWRKY03 was a nuclear localized protein. OsNPR1 as well as several other pathogenesis-related genes, such as OsPR1b, phenylalanine ammonia-lyase (ZB8) and peroxidase (POX22.3), were induced in OsWRKY03-overexpressing transgenic plants. These results indicated that OsWRKY03 is located upstream of OsNPR1 as a transcriptional activator in salicylic acid (SA)-dependent or jasmonic acid (JA)-dependent defense signaling cascades.

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“…Reduced nitrogen sources such as the amines putrescine and arginine in combination with a low pH are also excellent in vitro inducers of DON production (Gardiner et al, 2009a(Gardiner et al, , 2009cMerhej et al, 2011). Putrescine and arginine accumulate in F. graminearum infected wheat heads (Gardiner et al, 2010) and their biosynthesis is known to be upregulated in plants during defence responses (Haggag and Abd-El-Kareem, 2009;Walters, 2002). However, it is not understood how amines induce DON production in the fungus.…”

Section: Introductionmentioning

confidence: 99%

High-throughput FACS-based mutant screen identifies a gain-of-function allele of the Fusarium graminearum adenylyl cyclase causing deoxynivalenol over-production

Blum

Benfield

Stiller

et al. 2016

Fungal Genetics and Biology

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., High-throughput FACS-based mutant screen identifies a gain-of-function allele of the Fusarium graminearum adenylyl cyclase causing deoxynivalenol over-production, Fungal Genetics and Biology (2016), doi: http://dx.doi. org/10.1016/j.fgb. 2016.02.005 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ABSTRACTFusarium head blight and crown rot, caused by the fungal plant pathogen Fusarium graminearum, impose a major threat to global wheat production. During the infection, plants are contaminated with mycotoxins such as deoxynivalenol (DON), which can be toxic for humans and animals. In addition, DON is a major virulence factor during wheat infection. However, it is not fully understood how DON production is regulated in F. graminearum. In order to identify regulators of DON production, a high-throughput mutant screen using Fluorescence Activated Cell Sorting (FACS) of a mutagenized TRI5-GFP reporter strain was established and a mutant over-producing DON under repressive conditions identified. A gain-of-function mutation in the F. graminearum adenylyl cyclase (FAC1), which is a known positive regulator of DON production, was identified as the cause of this phenotype through genome sequencing and segregation analysis. Our results show that the high-throughput mutant screening procedure developed here can be applied for identification of fungal proteins involved in diverse processes.

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Methyl jasmonate alters polyamine metabolism and induces systemic protection against powdery mildew infection in barley seedlings

Cited by 136 publications

References 32 publications

Induction of phenolics, lignin and key defense enzymes in eggplant (Solanum melongena L.) roots in response to elicitors

Induction of phenolics, lignin and key defense enzymes in eggplant (Solanum melongena L.) roots in response to elicitors

OsWRKY03, a rice transcriptional activator that functions in defense signaling pathway upstream of OsNPR1

High-throughput FACS-based mutant screen identifies a gain-of-function allele of the Fusarium graminearum adenylyl cyclase causing deoxynivalenol over-production

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