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Titolo:
Environmentally sensitive, SA-dependent defense responses in the cpr22 mutant of Arabidopsis
Autore:
Yoshioka, K; Kachroo, P; Tsui, F; Sharma, SB; Shah, J; Klessig, DF;
Indirizzi:
Boyce Thompson Inst Plant Res, Ithaca, NY 14853 USA Boyce Thompson Inst Plant Res Ithaca NY USA 14853 s, Ithaca, NY 14853 USA Rutgers State Univ, Waksman Inst, Piscataway, NJ 08854 USA Rutgers State Univ Piscataway NJ USA 08854 Inst, Piscataway, NJ 08854 USA Rutgers State Univ, Dept Mol Biol & Biochem, Piscataway, NJ 08854 USA Rutgers State Univ Piscataway NJ USA 08854 chem, Piscataway, NJ 08854 USA
Titolo Testata:
PLANT JOURNAL
fascicolo: 4, volume: 26, anno: 2001,
pagine: 447 - 459
SICI:
0960-7412(200105)26:4<447:ESSDRI>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
SYSTEMIC ACQUIRED-RESISTANCE; ENHANCED DISEASE SUSCEPTIBILITY; RACE-SPECIFIC ELICITORS; SALICYLIC-ACID; PLANT DEFENSE; SIGNAL-TRANSDUCTION; GENE-EXPRESSION; CELL-DEATH; CLADOSPORIUM-FULVUM; PATHOGEN;
Keywords:
PR-1; PDF1.2; jasmonic acid; ethylene; humidity;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
50
Recensione:
Indirizzi per estratti:
Indirizzo: Klessig, DF Boyce Thompson Inst Plant Res, Tower Rd, Ithaca, NY 14853 USA Boyce Thompson Inst Plant Res Tower Rd Ithaca NY USA 14853 USA
Citazione:
K. Yoshioka et al., "Environmentally sensitive, SA-dependent defense responses in the cpr22 mutant of Arabidopsis", PLANT J, 26(4), 2001, pp. 447-459

Abstract

To investigate the signaling pathways through which defense responses are activated following pathogen infection, we have isolated and characterized the cpr22 mutant. This plant carries a semidominant, conditional lethal mutation that confers constitutive expression of the pathogenesis-related (PR)genes PR-7, PR-2 PR-5 and the defensin gene PDF1.2. cpr22 plants also display spontaneous lesion formation, elevated levels of salicylic acid (SA) and heightened resistance to Peronospora parasitica Emco5. The cpr22 locus was mapped to chromosome 2, approximately 2 cM telomeric to the AthB102 marker. By analyzing the progeny of crosses between cpr22 plants and either NahGtransgenic plants or npr1 mutants, all of the cpr22-associated phenotypes except PDF1.2 expression were found to be SA dependent. However, the SA signal transducer NPR1 was required only for constitutive PR-1 expression. A cross between cpr22 and ndr1-1 mutants revealed that enhanced resistance to P. parasitica is mediated by an NDR1-dependent pathway, while the other cpr22-induced defenses are not. Crosses between either coi1-1 or etr1-1 mutants further demonstrated that constitutive PDF1.2 expression is mediated by aJA- and ethylene-dependent pathway. Based on these results, the cpr22 mutation appears to induce its associated phenotypes by activating NPR1-dependent and NPR1-independent branches of the SA pathway, as well as an ethylene/JA signaling pathway. Interestingly, the SA-dependent phenotypes, but not the SA-independent phenotypes, are suppressed when cpr22 mutants are grown under high humidity.

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Documento generato il 01/04/20 alle ore 11:43:37