Metabolism of 1-Aminocyclopropane-1-Carboxylic Acid

Yang, Shang Fa; Liu, Y.; Su, Ling-Yuan; Peiser, Galen; Hoffman, Neil E.; McKeon, Thomas A.

doi:10.1016/b978-0-407-00920-2.50006-8

Cited by 6 publications

(3 citation statements)

References 42 publications

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“…This is in line with earlier works indicating that plants transformed with the antisense construct AC0lAs give abnormally small ethylene yields when supplted with ACC (Hamilton et al, 1990) and that expression of the sense gene correlates positively with ethylene production in ripening fruits and wounded leaves (Holdsworth et al, 1987). However, the view that a moderate decrease in ACC oxidase can regulate ethylene biosynthesis is contrary to the generally accepted view (Yang et al, 1985) that the amounts of the enzyme are constitutively in excess and that changes in activity levels have little regulatory significance compared to that of the unstable enzyme ACC synthase (Theologis et al, 1992).…”

Section: Scussl Oncontrasting

confidence: 56%

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Increased 1-Aminocyclopropane-1-Carboxylic Acid Oxidase Activity in Shoots of Flooded Tomato Plants Raises Ethylene Production to Physiologically Active Levels

et al. 1995

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Soil flooding increased 1 -aminocyclopropane-1 -carboxylic (ACC) acid oxidase activity in petioles of wild-type tomato (Lycopersicon esculentum 1.) plants within 6 to 12 h in association with faster rates of ethylene production. Petioles of flooded plants transformed with an antisense construct to one isoform of an ACC oxidase gene (ACO1) produced less ethylene and had lower ACC oxidase activity than those of the wild type. Flooding promoted epinastic curvature but did so less strongly in plants transformed with the antisense construct than in the wild type. Exogenous ethylene, supplied to well-drained plants, also promoted epinastic curvature, but transformed and wild-type plants responded similarly. Flooding increased the specific delivery (flux) of ACC to the shoots (picomoles per second per square meter of leaf) in xylem sap flowing from the roots. The amounts were similar in both transformed and wild-type plants. These observations demonstrate that changes in ACC oxidase activity in shoot tissue resulting from either soil flooding or introducing ACC oxidase antisense constructs can influence rates of ethylene production to a physiologically significant extent. They also implicate systemic root to shoot signals in regulating the activity of ACC oxidase in the shoot.In this paper we examine the possible role of ACC oxidation in regulating ethylene biosynthesis in vegetative shoots of flooded tomato (Lycopersicon esculentum) plants.We also assess whether changes in ethylene production attributable to different levels of ACC oxidase activity are of physiological significance for the shoots of flooded plants. During soil flooding, the root environment becomes depleted of oxygen (Grable, 1966). In response, shoot systems show a wide range of physiological and biochemical changes. Some of these changes, such as petiole epinasty in tomato, may be adaptive (Armstrong et al., 1994). Epinasty can be observed within 6 to 12 h of flooding (Jackson and Campbell, 1975) and is brought about by the action of ethylene, following enhanced accumulation (Kawase, 1972) and production (Bradford and Dilley, 1978;

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Section: Scussl Oncontrasting

confidence: 56%

“…Thus, ACC oxidase could regulate ethylene biosynthesis in the leaves of flooded tomato plants when ACC is plentiful. However, such a conclusion would be contrary to the generally accepted view of ACC oxidase as a highly expressed enzyme present in amounts that exceed those needed to oxidize endogenous ACC (Yang et al, 1985).…”

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confidence: 50%

Increased 1-Aminocyclopropane-1-Carboxylic Acid Oxidase Activity in Shoots of Flooded Tomato Plants Raises Ethylene Production to Physiologically Active Levels

et al. 1995

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“…In addition to ethylene formation, ACC can be conjugated to form N-malonyl-1-aminocyclopropane-l-carboxylic acid (MACC) (Hoffman et al 1982). The conjugation of ACC to MACC is essentially irreversible and has been suggested to have a role in controlling ethylene biosynthesis (Yang et al 1985) 9 The phenomena of stress to promote ethylene biosynthesis, and the ability of the triazoles to protect plants from stress, suggests an interesting relationship between ethylene and triazoles.…”

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confidence: 99%

Uniconazole inhibits stress-induced ethylene in wheat and soybean seedlings

Kraus

Murr

Fletcher

1991

J Plant Growth Regul

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Abstract.Previous studies have shown that uniconazole inhibits ethylene synthesis and protects plants from various stresses. The present research was conducted to delineate the mechanism of ethylene inhibition by uniconazole [(E)-(p-chlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-1-yl)-l-penten-3-ol]. Following heat stress of 48~ for 3 h, the shoots of the control wheat seedlings became desiccated, and the seedlings lost 23% of their fresh mass 8 h after stress. The control soybean seedlings had epinastic unifoliate leaves 5 h after foliar application (4.4 g.a.i./ha) of the herbicide triclopyr [(3,5,6-trichloro-2-pyridinyl)oxyacetic acid]. Soil drench applications of uniconazole, a potent member of the triazole family, reduced these symptoms associated with heat and herbicide stress in wheat (5.0 mg/L) and soybean (0.4 mg/L) seedlings, respectively.Basal ethylene production was inhibited 32 and 48% by uniconazole in the wheat and acotyledonous soybean seedlings, respectively. Following a 48~ heat stress, 1-aminocyclopropane-1-carboxylic acid (ACC) levels increased 40% in both the control and uniconazole-treated wheat seedlings. After triclopyr application, ACC levels increased 400% in botl?, the control and uniconazoletreated soybean seedlings: The increased ACC levels, following stress, Were accompanied by increased ethylene production from the control, but not from the uniconazole-trea~ed wheat and acotyledonous soybean seedlings. ~iconazole treat-" ment did not significantly chang,e the basal or stress-induced N-malonyl-1-aminoc~r~lopropane-1-carboxylic acid (MACC) levels compa~ to controis. These results suggest that uniconazo"le inhibits ethylene synthesis by interfering with the conversion of ACC to ethylene in wheat and acotyledonous soybean seedlings. Ethylene production and ACC conversion were not inhibited by uniconazole in excised soybean cotyledons. These results indicate that different ethylene-forming enzyme (EFE) systems operate in the soybean acotyledonous seedling and cotyledon, and the system in the former is inhibited by uniconazole.

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Cell Separation Events in Poplar in Response to Sulphur Dioxide and Ozone: Involvement of Ethylene

Kargiolaki

1989

Cell Separation in Plants

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Metabolism of 1-Aminocyclopropane-1-Carboxylic Acid

Cited by 6 publications

References 42 publications

Increased 1-Aminocyclopropane-1-Carboxylic Acid Oxidase Activity in Shoots of Flooded Tomato Plants Raises Ethylene Production to Physiologically Active Levels

Increased 1-Aminocyclopropane-1-Carboxylic Acid Oxidase Activity in Shoots of Flooded Tomato Plants Raises Ethylene Production to Physiologically Active Levels

Uniconazole inhibits stress-induced ethylene in wheat and soybean seedlings

Cell Separation Events in Poplar in Response to Sulphur Dioxide and Ozone: Involvement of Ethylene

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