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Titolo:
A deficiency of coproporphyrinogen III oxidase causes lesion formation in Arabidopsis
Autore:
Ishikawa, A; Okamoto, H; Iwasaki, Y; Asahi, T;
Indirizzi:
Fukei Prefectural Univ, Dept Biosci, Fukui 9101195, Japan Fukei Prefectural Univ Fukui Japan 9101195 Biosci, Fukui 9101195, Japan
Titolo Testata:
PLANT JOURNAL
fascicolo: 2, volume: 27, anno: 2001,
pagine: 89 - 99
SICI:
0960-7412(200107)27:2<89:ADOCIO>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
SYSTEMIC ACQUIRED-RESISTANCE; PLANT-DISEASE RESISTANCE; PROGRAMMED CELL-DEATH; SALICYLIC-ACID; UROPORPHYRINOGEN DECARBOXYLASE; PROTOPORPHYRINOGEN OXIDASE; CHLOROPHYLL BIOSYNTHESIS; DEFENSE RESPONSES; ANTISENSE RNA; TETRAPYRROLE-BIOSYNTHESIS;
Keywords:
CPO; tetrapyrrole; porphyrin; lesion; salicylic acid; defense response;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
59
Recensione:
Indirizzi per estratti:
Indirizzo: Ishikawa, A Fukei Prefectural Univ, Dept Biosci, Fukui 9101195, Japan Fukei Prefectural Univ Fukui Japan 9101195 ui 9101195, Japan
Citazione:
A. Ishikawa et al., "A deficiency of coproporphyrinogen III oxidase causes lesion formation in Arabidopsis", PLANT J, 27(2), 2001, pp. 89-99

Abstract

We isolated an Arabidopsis lesion initiation 2 (lin2) mutant, which develops lesion formation on leaves and siliques in a developmentally regulated and light-dependent manner. The phenotype of the lin2 plants resulted from asingle nuclear recessive mutation, and LIN2 was isolated by a T-DNA tagging approach. LIN2 encodes coproporphyrinogen III oxidase, a key enzyme in the biosynthetic pathway of chlorophyll and heme, a tetrapyrrole pathway, in Arabidopsis. The lin2 plants express cytological and molecular markers associated with the defense responses, usually activated by pathogen infection. These results demonstrate that a porphyrin pathway impairment is responsible for the lesion initiation phenotype, which leads to the activation of defense responses, in Arabidopsis. Lesion formation was not suppressed, and was even enhanced when accumulation of salicylic acid (SA) was prevented in lin2 plants by the expression of an SA-degrading salicylate hydroxylase (nahG) gene. This suggests that the lesion formation triggered in lin2 plants is determined prior to or independently of the accumulation of SA but that the accumulation is required to limit the spread of lesions in lin2 plants.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 01:01:21