Phytoalexins in defense against pathogens

Ahuja, Ishita; Kissen, Ralph; Bones, Atle M.

doi:10.1016/j.tplants.2011.11.002

Cited by 924 publications

(667 citation statements)

References 157 publications

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“…These biotic stress-induced antifungal compounds are defined as phytoalexins (Ahuja et al, 2012). Phytoalexins have a crucial role in plant defense against pathogens.…”

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confidence: 99%

“…Phytoalexins have a crucial role in plant defense against pathogens. Camalexin (Tsuji et al, 1992;Glazebrook and Ausubel, 1994) and rapalexin A (Pedras and Adio, 2008;Ahuja et al, 2012) are known to be phytoalexins of Arabidopsis. The biosynthesis pathway and the related enzymes of camalexin have been well characterized (Ahuja et al, 2012).…”

mentioning

confidence: 99%

“…Camalexin (Tsuji et al, 1992;Glazebrook and Ausubel, 1994) and rapalexin A (Pedras and Adio, 2008;Ahuja et al, 2012) are known to be phytoalexins of Arabidopsis. The biosynthesis pathway and the related enzymes of camalexin have been well characterized (Ahuja et al, 2012). PHYTOALEXIN DEFICIENT3, which encodes an enzyme catalyzing the final step of camalexin biosynthesis, is required for defense against the necrotrophic fungus Alternaria brassicicola (Thomma et al, 1999).…”

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confidence: 99%

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Leaf Oil Body Functions as a Subcellular Factory for the Production of a Phytoalexin in Arabidopsis

et al. 2013

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“…These biotic stress-induced antifungal compounds are defined as phytoalexins (Ahuja et al, 2012). Phytoalexins have a crucial role in plant defense against pathogens.…”

mentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Leaf Oil Body Functions as a Subcellular Factory for the Production of a Phytoalexin in Arabidopsis

et al. 2013

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“…(Lugtenberg and Kamilova 2009;Sarma et al 2015). Further there are reports that induced defense signalling via priming with microbes have indirect effect on the concentration of various biomolecules having medicinal properties like antioxidant compounds and polyphenols (Ahuja et al 2012;Wang and Zheng 2005). Thus, since last decade, in order to harness the beneficial biological activities of the microbes they have been actively used as live cultures in the fields.…”

Section: Introductionmentioning

confidence: 99%

Microbial secondary metabolites ameliorate growth, in planta contents and lignification in Withania somnifera (L.) Dunal

Singh

Gupta

Srivastava

et al. 2016

Physiol Mol Biol Plants

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In the present investigation, metabolites of Streptomyces sp. MTN14 and Trichoderma harzianum ThU significantly enhanced biomass yield (3.58 and 3.48 fold respectively) in comparison to the control plants. The secondary metabolites treatments also showed significant augmentation (0.75-2.25 fold) in withanolide A, a plant secondary metabolite. Lignin deposition, total phenolic and flavonoid content in W. somnifera were maximally induced in treatment having T. harzianum metabolites. Also, Trichoderma and Streptomyces metabolites were found much better in invoking in planta contents and antioxidants compared with their live culture treatments. Therefore, identification of new molecular effectors from metabolites of efficient microbes may be used as biopesticide and biofertilizer for commercial production of W. somnifera globally.

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“…Phytoalexin plays a key role in the plant defense system against several harmful microbes and herbivores (Ahuja et al 2012;Ali and Agrawal 2012). Umbelliferone has been reported as a phytoalexin of Platanus acerifolia and is phytotoxic (Afek et al 1999).…”

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confidence: 99%

Molecular cloning and characterization of coumarin glucosyltransferase in hairy roots of Pharbitis nil (Ipomoea nil)

Kanoh

Kawauchi

Kuroyanagi

et al. 2014

Plant Biotechnology

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The hairy roots induced from Pharbitis nil (Ipomoea nil) by infection of the plant pathogen Agrobacterium rhizogenes produced and released the phytoalexin of umbelliferone into the culture medium by treatment with copper sulfate. However, this umbelliferone was immediately recovered in the hairy roots as its glucoside, skimmin, after a few hours. To analyze the details of these phenomena, we searched for glucosyltransferase (GTase) genes related to skimmin production and isolated two full-length cDNAs, named PNgt1 and PNgt2. They contain the plant secondary product glucosyltransferase (PSPG) box that is a common signature of plant GTases. Phylogenetic analyses of PNgt1 and PNgt2 indicated that they encode a broad substrate-specific GTase and an unclassified GTase, respectively. An enzyme assay of the recombinant PNGT1 protein showed a high glucosylation rate against coumarin and benzaldehyde derivatives, especially umbelliferone. The expression level of PNgt1 after treatment with umbelliferone showed a correlation with skimmin production. Moreover, we found the expression levels of PNgt1 were altered by the plant hormones salicylic acid and methyl jasmonate. These results suggest the importance of plant GTases in phytoalexin production and plant defense mechanisms.

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Phytoalexins in defense against pathogens

Cited by 924 publications

References 157 publications

Leaf Oil Body Functions as a Subcellular Factory for the Production of a Phytoalexin in Arabidopsis

Leaf Oil Body Functions as a Subcellular Factory for the Production of a Phytoalexin in Arabidopsis

Microbial secondary metabolites ameliorate growth, in planta contents and lignification in Withania somnifera (L.) Dunal

Molecular cloning and characterization of coumarin glucosyltransferase in hairy roots of Pharbitis nil (Ipomoea nil)

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