Phenotypic Reversion of
            <i>Flacca</i>
            , a Wilty Mutant of Tomato, by Abscisic Acid

Imber, D.; Tal, Moshe

doi:10.1126/science.169.3945.592

Cited by 118 publications

(54 citation statements)

References 19 publications

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“…Paradoxically to the long-standing view that ABA is generally inhibitory to shoot growth, it has been observed for over 30 years that ABA-deficient mutants are often shorter and have smaller leaves than the corresponding wild types, and that leaf and stem growth can be substantially restored by applying ABA (Imber & Tal 1970;Bradford 1983;Quarrie 1987). As already mentioned, in addition to reduced growth, ABA-deficient mutants are typically wilty even when the soil is well supplied with water.…”

Section: Reassessment Of the Role Of Aba In Shoot Growth Of Tomato Anmentioning

confidence: 99%

“…This results from high stomatal conductance and has also been shown to involve decreased root hydraulic conductance. These effects can also be prevented by applying ABA (Imber & Tal 1970;Tal & Nevo 1973;Koornneef et al 1982;Bradford 1983). Accordingly, the inhibited shoot growth of ABAdeficient mutants of tomato and Arabidopsis has been attributed to shoot water deficits (Bradford 1983;Neill, McGaw & Horgan 1986;Nagel, Konings & Lambers 1994;Léon-Kloosterziel et al 1996).…”

Section: Reassessment Of the Role Of Aba In Shoot Growth Of Tomato Anmentioning

confidence: 99%

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Interaction with ethylene: changing views on the role of abscisic acid in root and shoot growth responses to water stress

Sharp

2002

Plant Cell & Environment

409

248

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Shoot and root growth are differentially sensitive to water stress. Interest in the involvement of hormones in regulating these responses has focused on abscisic acid (ABA) because it accumulates in shoot and root tissues under water-limited conditions, and because it usually inhibits growth when applied to well-watered plants. However, the effects of ABA can differ in stressed and non-stressed plants, and it is therefore advantageous to manipulate endogenous ABA levels under water-stressed conditions. Studies utilizing ABA-deficient mutants and inhibitors of ABA synthesis to decrease endogenous ABA levels, and experimental strategies to circumvent variation in plant water status with ABA deficiency, are changing the view of the role of ABA from the traditional idea that the hormone is generally involved in growth inhibition. In particular, studies of several species indicate that an important role of endogenous ABA is to limit ethylene production, and that as a result of this interaction ABA may often function to maintain rather than inhibit shoot and root growth. Despite early speculation that interaction between these hormones may influence many of the effects of water deficit, this topic has received little attention until recently.

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Section: Reassessment Of the Role Of Aba In Shoot Growth Of Tomato Anmentioning

confidence: 99%

Section: Reassessment Of the Role Of Aba In Shoot Growth Of Tomato Anmentioning

confidence: 99%

Interaction with ethylene: changing views on the role of abscisic acid in root and shoot growth responses to water stress

Sharp

2002

Plant Cell & Environment

409

248

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“…It was also reported recently that ABA increases the permeability of plant tissues to water (Glinka and Reinhold 1971). In addition, work on a wilty tomato mutant has shown that the impairment of the closure of its stomata may be corrected by treatment with ABA (Imber and Tal 1970).…”

Section: Introductionmentioning

confidence: 99%

Hormonal Modification of Plant Response to Water Stress

Mizrahi¹,

Richmond²

1972

Aust. Jnl. Of Bio. Sci.

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Addition of either kinetin or abscisic acid (ABA) to the root medium of tobacco plants grown in culture solution greatly modified their response to different types of root stresses that were applied 48 hr after the addition of the hormones.All the stresses employed impaired the water balance of the plants as evidenced by a decline of shoot turgor. The stresses consisted of cessation in root aeration, reduction of root temperature, and decrease in the osmotic potential of the root media by addition of either N aCl or mannitol.Response of plants to a stress was estimated by measuring the water saturation deficit (W.S.D.) in the leaves 3 hr after the stress started. Pretreatment with kinetin resulted in an increased W.S.D. in the leaves whereas pretreatment with ABA, with the exception of the 3-hr saline stress, effected decreased W.S.D. in comparison with the appropriate controls.A possible explanation of this phenomenon and its practical applications are discussed.

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“…However, several lines of evidence suggested increased pollutant uptake may not be responsible for the increased injury with FC. In the tomato mutant, the stomata remain open under conditions that induce closure in normal tomato plants (7), which would ensure similar SO2 uptake in FC treated and untreated plants. In peas exposed to a low concentrationof SO2 (0.12 ,ul I'),S02 fluxes were similar for both FC treated and untreated plants (TableI).…”

Section: Methodsmentioning

confidence: 99%

“…To separate the effects of FC on cellular transport processes from effects on stomatal conductance, a tomato mutant (Lycopersicon esculentum Mill. var Flacca) was used which has permanently open stomata (7), and peas (Pisum sativum L. cv Alsweet) were exposed in the light when leaf conductance was assumed to be at maximum for both FC treated and untreated plants. 6 1 1-').…”

mentioning

confidence: 99%

Fusicoccin and Air Pollutant Injury to Plants

Olszyk¹,

Tingey²

1984

Plant Physiol.

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Garden peas (Pisum satiram L. cv Alsweet) and a tomato mutant (Lyceperuicon ncuewkatwm Mill. varflacca) were sprayed with fusicoccin, a fungal toxin affecting membrane transport properties, before exposure to S02 or 03. Tomatoes treated with 10 micromolar fusicoccin and exposed to S02 (0.6 microliter per liter for 2 hours) exhibited twice as much foliar necrosis as untreated plants exposed to SO2. Peas treated with fusicoccin and exposed to SO2 (0.7 to 1.0 microliter per liter for 2 hours) exhibited 2 to 6 times more injury than untreated plants exposed to SO2. Peas treated with fusicoccin and exposed to 03 had less injury than untreated plants exposed to 03(0.1 to 03 microliter per liter for 2 hours). Several lines of evidence suggested that the fusicocNA n en ment of S02 injury is not the result of increased gas exchange, iUe. the tomato mutant has permanently open stomata under all conditions, and in peas fusicoccin had no effect on 52 or H20 flux in plants exposed to 0.12 microliter per liter SO2. However, a 21% greater leaf conductance in fusicoccin treated versus untreated plants indicated the possibility of some differences in gas exchange for peas exposed to 1.0 microliter per liter S02.The phytotoxicity of SO2 and 03 is determined by pollutant uptake, detoxification, and metabolism at cellular perturbation sites (17, 18). The cellular metabolism of the pollutants is especially important since gas-phase conductance alone cannot fully explain plant response to either SO2 or 03 (5, 15, 17, 18). Sulfite and bisulfite are the likely SO2 metabolites transported into cells since the gas is rapidly hydrated following dissolution into water on cellular surfaces (12). The mechanism and importance of sulfite transport into cells in relation to injury has not been directly investigated; however, Bressan et al. (1) suggested that intraspecific variability in SO2 sensitivity in cucumber resulted from differences in the uptake and transport of SO2 and sulfite across the plasma membrane. Ozone is less water soluble than SO2 but may be transported into cells as 03 (10) or as free oxyradicals which can be produced when 03 dissolves in water at high pH (5).The fungal toxin FC2 is widely used in studying membrane transport processes. Marre (9) suggested that FC activated a plasma membrane system which uses ATP for HI extrusion with an accompanying hyperpolarization of the transmembrane elec-

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Phenotypic Reversion of Flacca , a Wilty Mutant of Tomato, by Abscisic Acid

Cited by 118 publications

References 19 publications

Interaction with ethylene: changing views on the role of abscisic acid in root and shoot growth responses to water stress

Interaction with ethylene: changing views on the role of abscisic acid in root and shoot growth responses to water stress

Hormonal Modification of Plant Response to Water Stress

Fusicoccin and Air Pollutant Injury to Plants

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