Plant Stress Responses: Discussion of Models for Racespecific Resistance

Kuhn, David N.

doi:10.1007/978-1-4757-0274-3_7

Cited by 3 publications

(4 citation statements)

References 42 publications

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“…The induction of CHS mRNA in leaves fits with some of the current hypotheses of the defense response in plants (13). The induction is greater in response to an avirulent race than to a virulent race.…”

Section: Induction Of Mrna In Pathogen Inoculated Leavessupporting

confidence: 79%

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Increase of Chalcone Synthase mRNA in Pathogen-Inoculated Soybeans with Race-Specific Resistance Is Different in Leaves and Roots

Dhawale¹,

Souciet²,

Kuhn³

1989

Plant Physiol.

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Soybeans (Glycine max [L.] Merr.) respond to pathogens by producing isoflavonoid-derived phytoalexins. Chalcone synthase (CHS) is the first enzyme of the flavonoid/isoflavonoid biosynthetic pathway. We investigated changes in the steady state levels of CHS mRNA and other specific mRNAs at increasing times after inoculation in two different race-specific interactions, one between leaves and the bacterium Pseudomonas syringae pv glycinea (Psg), and one between roots and the fungus, Phytophthora megasperma f. sp. glycinea (Pmg). The amount of CHS mRNA increases significantly in soybean leaves inoculated with an avirulent race of Psg but not with a virulent race or water. In contrast, the increase in CHS mRNA is similar in roots inoculated with zoospores of either an avirulent or virulent race of Pmg. CHS mRNA increases significantly in pathogen inoculated roots but not in uninoculated controls. Hydroxyproline-rich glycoprotein (HRGP) has been observed by others to increase in wounded or pathogen-inoculated plants. We report here that HRGP mRNA levels are greater in roots inoculated with an avirulent Pmg race than with a virulent race, but inoculation with either race causes a significant increase in HRGP mRNA with respect to controls. Calmodulin or ubiquitin mRNA do not increase in either uninoculated or inoculated roots and leaves. The possibility that racespecific resistance in soybeans is expressed differently in different organs of the plant is discussed.Soybeans (Glycine max [L.] Merr.) respond actively to pathogen stress by producing phytoalexins and other stress metabolites (13). Stress metabolite production is correlated with resistance but is also observed in susceptible plants. In race-specific resistance, a cultivar is resistant to a particular race of the pathogen but susceptible to another. In a gene-forgene interaction, race-specific resistance is usually inherited as a single gene dominant trait in the host, and closely related avirulent and virulent races can be used to incite resistance

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Section: Induction Of Mrna In Pathogen Inoculated Leavessupporting

confidence: 79%

“…respond actively to pathogen stress by producing phytoalexins and other stress metabolites (13). Stress metabolite production is correlated with resistance but is also observed in susceptible plants.…”

mentioning

confidence: 99%

Increase of Chalcone Synthase mRNA in Pathogen-Inoculated Soybeans with Race-Specific Resistance Is Different in Leaves and Roots

Dhawale¹,

Souciet²,

Kuhn³

1989

Plant Physiol.

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“…Such stress can result from injuries caused by the attack of insects and microbes or by mechanical wounding, and can induce many distinctive biochemical changes. These include the production of protective compounds either at the site of injury, or systemically in distant unwounded tissues (Kuhn 1988 ; Bowles 1990 ; Ryan 1990 ). In plants, phenylalanine is derived from the precursor chorismate and leads to the flavonoid, phenylpropanoid and stilbenoid biosynthetic pathways.…”

Section: Introductionmentioning

confidence: 99%

Chalcone synthase and its functions in plant resistance

2011

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Chalcone synthase (CHS, EC 2.3.1.74) is a key enzyme of the flavonoid/isoflavonoid biosynthesis pathway. Besides being part of the plant developmental program the CHS gene expression is induced in plants under stress conditions such as UV light, bacterial or fungal infection. CHS expression causes accumulation of flavonoid and isoflavonoid phytoalexins and is involved in the salicylic acid defense pathway. This review will discuss CHS and its function in plant resistance.

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“…Il existe toutefois des exemples où une action sur la respiration cellulaire est signalée (Yoshikawa et al, 1987). Enfin (Yoshikawa et al, 1978b;Yoshikawa, 1983;Chappell et Hahlbrock, 1984;Ryder et al, 1984;Schmelzer et al, 1984;Cramer et al, 1985;Ryder et al, 1986;Hamdan et Dixon, 1987;Kuhn, 1988).…”

Section: Déterminisme Génétiqueunclassified

Les phytoalexines et leur intervention dans la résistance hypersensible aux champignons phytopathogènes

Rouxel¹

1989

Agronomie

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Plant Stress Responses: Discussion of Models for Racespecific Resistance

Cited by 3 publications

References 42 publications

Increase of Chalcone Synthase mRNA in Pathogen-Inoculated Soybeans with Race-Specific Resistance Is Different in Leaves and Roots

Increase of Chalcone Synthase mRNA in Pathogen-Inoculated Soybeans with Race-Specific Resistance Is Different in Leaves and Roots

Chalcone synthase and its functions in plant resistance

Les phytoalexines et leur intervention dans la résistance hypersensible aux champignons phytopathogènes

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