Induction of Peroxidase Activity by Ethylene in Sweet Potato

Imaseki, Hidemasa

doi:10.1104/pp.46.1.172

Cited by 47 publications

(15 citation statements)

References 15 publications

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“…Imasaki (12) found only a 10 to 20% inhibition of peroxidase development at 0 to 10 pd of ethylene/ 1 air only after 40 to 50 hr exposure to CO.. As reported, CO2 has failed to reverse also other ethylene-enhanced processes (3,6,15).…”

Section: Discussionmentioning

confidence: 80%

“…Previous work (6) has shown that cut injury is responsible for the alteration of the pattern and for the increase in activity of isoperoxidases in the pith following excision. Injury-induced increases in peroxidase activity are known to occur in various organs of many plants, particularly in sweet potato roots (12,14,16). These increases are attributed to the action of injury-induced ethylene, especially since exogenous ethylene has been shown to promote peroxidase activity in injured tissue (13,21).…”

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confidence: 99%

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Comparative Studies on Tobacco Pith and Sweet Potato Root Isoperoxidases in Relation to Injury, Indoleacetic Acid, and Ethylene Effects

Birecka¹,

Briber²,

Catalfamo³

1973

Plant Physiol.

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Sweet potato (Ipomoea batatas) root parenchyma and tobacco (Nicotiana tabacum) stem pith, both known to increase peroxidase activity after excision, differed from each other in their isoperoxidase patterns and in the isoperoxidase responses to injury and exogenous ethylene.In potato root sections, the injury-dependent peroxidase increase was due to an induction of two isoenzymes, as well as to a promotion of some constitutive ones. In tobacco pith, this increase was entirely due to seven isoperoxidases not detectable, or detectable only in traces, immediately after excision. Actinomycin D did not inhibit the development of any isoperoxidases in the potato root sections and strongly repressed the development of all injury-induced isoenzymes in tobacco pith. Cycloheximide totally inhibited the development of all isoperoxidases in both species, with the exception of two injuryenhanced isoenzymes in root parenchyma.In root sections, indoleacetic acid had a weak inhibitory effect on one injury-induced isoperoxidase only, whereas in tobacco pith it inhibited the development of the injury-induced, as well as the constitutive, isoperoxidases.Exogenous ethylene did not induce, enhance, or significantly suppress any of the tobacco pith isoenzymes, whereas in potato root sections, it suppressed slightly the development of the injury-induced, had no effect on some of the injuryenhanced, and greatly promoted some of the injury-unaffected or-enhanced isoperoxidases. Removal of ethylene stopped the ethylene-dependent peroxidase increase without affecting the injury-induced increase. When applied to intact potato roots, ethylene did not induce any new isoperoxidases and promoted the same constitutive isoenzymes as it did in root sections.

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Section: Discussionmentioning

confidence: 80%

mentioning

confidence: 99%

Comparative Studies on Tobacco Pith and Sweet Potato Root Isoperoxidases in Relation to Injury, Indoleacetic Acid, and Ethylene Effects

Birecka¹,

Briber²,

Catalfamo³

1973

Plant Physiol.

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“…et al (24) reported that sweet potato slices infected with the black rot fungus produced low concentrations of ethylene and that ethylene per se stimulated peroxidase formation, even in uninoculated tissue. Imaseki et al (10,12) also showed that the peroxidase content of sweet potato slices was significantly enhanced by a low concentration of ethylene exogenously supplied to the slices. It was noted by Imaseki et al (11) that even though ethylene caused a marked increase in peroxidase activity in sweet potato slices, the ethylene did not alter the qualitative complement isozymes.…”

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confidence: 98%

De Novo Synthesis of Peroxidase Isozymes in Sweet Potato Slices

1971

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(1,3,4,9,18,(20)(21)(22). The rise usually begins after a lag of several hours and continues to increase over a period of several days, at which time the activity may be many times larger than in fresh tissue. Included among the metabolic changes is the increase in the activities of several enzymes, including peroxidase (E.C.1.-11.1.7) (8,15). Kawashima and Uritani (15) showed that peroxidase activity increased even more rapidly when the slices were infected with the black rot fungus, Ceratocystis fimbriata. Stahmann I

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“…In (10). By contrast, CO, (5%) increases the threshold for ethylene action by acting as a competitive inhibitor (4,6,10). Thus, by employing reduced pressure, reduced oxygen levels, and enrichment of CO2, we simultaneously promote ethylene escape, diminish ethylene production, and lower ethylene action.…”

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confidence: 99%

“…The present study was conducted to determine whether the previously observed repression of newly appearing isoperoxidases in tobacco pith is due to auxin itself or to ethylene. In (10). By contrast, CO, (5%) increases the threshold for ethylene action by acting as a competitive inhibitor (4,6,10).…”

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confidence: 99%

Differential Effects of Ethylene on Pith Peroxidase of Intact Tobacco Plants and Excised Tissue

Adams

Galston²

1974

Plant Physiol.

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Ethylene increases the pith peroxidase activity of intact tobacco plants (Nicotiana tabacum) but not of excised pith, either at atmospheric or reduced pressures. In the intact plant, the increased activity involves augmentation of the two constitutive anodic isoperoxidases. In the excised pith, ethylene strongly represses one injury-induced isoperoxidase, while not markedly affecting other isozymes known to be repressed by auxin. Thus, the previously described auxin-induced repression of peroxidase is not due mainly to auxin-induced ethylene formation.Freshly excised tobacco pith has low peroxidase activity, attributable mainly to a rapidly moving group of constitutive anodic isozymes. Following excision and aseptic culture of the pith, new cathodic and slowly moving anodic isoperoxidases appear and increase rapidly in activity. Treatment of excised pith with physiological levels of auxins largely inhibits the appearance and increase of these new isoperoxidases (3,8 RESULTS AND DISCUSSIONConfirming the results of numerous authors with many plant materials (1), ethylene treatment of intact tobacco plants resulted in a large enhancement of total peroxidase activity in the pith of upper, middle, and lower internodes by all concentrations of ethylene employed (Fig. 1)

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Induction of Peroxidase Activity by Ethylene in Sweet Potato

Cited by 47 publications

References 15 publications

Comparative Studies on Tobacco Pith and Sweet Potato Root Isoperoxidases in Relation to Injury, Indoleacetic Acid, and Ethylene Effects

Comparative Studies on Tobacco Pith and Sweet Potato Root Isoperoxidases in Relation to Injury, Indoleacetic Acid, and Ethylene Effects

De Novo Synthesis of Peroxidase Isozymes in Sweet Potato Slices

Differential Effects of Ethylene on Pith Peroxidase of Intact Tobacco Plants and Excised Tissue

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