Studies on the diurnal courses of the contents of abscisic acid, 1-aminocyclopropane carboxylic acid and its malonyl conjugate in needles of damaged and undamaged spruce trees

Yang, Chien-Wen; Wessler, A.; Wild, Aloysius

doi:10.1016/s0176-1617(11)80467-0

Cited by 10 publications

(3 citation statements)

References 13 publications

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“…However, this is a speculative, albeit testable, hypothesis. Indeed, some experimental papers show contrary dynamics to what is assumed here (Dingkuhn et al, 1991; Jackson et al, 1995; Lee et al, 2006; Lovisolo et al, 2008; Qiu et al, 2017; Yang et al, 1993) while others are (partially) in line with the hypothesized time course of ABA (Corlett et al, 1998; Dingkuhn et al, 1991; Elamry & Hegazy, 1997; Haque et al, 2017; Jackson et al, 1995; Lovisolo et al, 2008; McAdam et al, 2011; Socias et al, 1997; Tardieu & Simonneau, 1998). Apparently, the literature seems inconclusive in this regard, underscoring the need for further experiments.…”

Section: Discussioncontrasting

confidence: 65%

Stomatal regulation prevents plants from critical water potentials during drought: Result of a model linking soil–plant hydraulics to abscisic acid dynamics

Wankmüller

Carminati

2021

Ecohydrology

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Understanding stomatal regulation during drought is essential to correctly predict vegetation-atmosphere fluxes. Stomatal optimization models posit that stomata maximize the carbon gain relative to a penalty caused by water loss, such as xylem cavitation. However, a mechanism that allows the stomata to behave optimally is unknown. Here, we introduce a model of stomatal regulation that results in similar stomatal behaviour without presupposing an optimality principle. By contrast, the proposed model explains stomatal closure based on a well-known component of stomatal regulation: abscisic acid (ABA). The ABA level depends on its production rate, which is assumed to increase with declining leaf water potential, and on its degradation rate, which is assumed to increase with assimilation rate. Our model predicts that stomata open until the ratio of leaf water potential to assimilation rate, proportional to ABA level, is at a minimum. As a prerequisite, the model simulates soil-plant hydraulics and leaf photosynthesis under varying environmental conditions. The model predicts that in wet soils and at low vapour pressure deficit (VPD), when there is no water limitation, stomatal closure is controlled by the relationship between photosynthesis and stomatal conductance. In dry soils or at high VPD, when the soil hydraulic conductivity limits the water supply, stomatal closure is triggered by the sharp decline in leaf water potential as transpiration rate increases. Being adaptive to changing soil and atmospheric conditions, the proposed model can explain how plants are enabled to avoid critical water potentials during drought for varying soil properties and atmospheric conditions. K E Y W O R D S abscisic acid (ABA), drought, root water uptake, soil-plant hydraulics, stomatal regulation 1 | INTRODUCTION Stomata regulate gas exchange between plants and the atmosphere allowing plants to take up CO 2 while controlling water loss. During drought, uncertainties in stomatal behaviour challenge the predictions of vegetation-atmosphere fluxes (Trugman et al., 2018). It includes uncertainties related to future terrestrial carbon cycling and underscores the need to better understand stomatal behaviour during drought.Stomata adjust to drought conditions by reducing plant water loss. This is a response to declining plant water status and has been

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Section: Discussioncontrasting

confidence: 65%

Stomatal regulation prevents plants from critical water potentials during drought: Result of a model linking soil–plant hydraulics to abscisic acid dynamics

Wankmüller

Carminati

2021

Ecohydrology

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“…In these experimental systems, the first step in ethylene biosynthesis is the conversion of methionine to S-adenosylmethionine (AdoMet), which is subsequently converted to 1-aminocyclopropane-1-carboxylic acid (ACC) by ACC synthase. 1-Aminocyclopropane-1-carboxylic acid has been identified in several conifers (Savidge et al 1983, Yang et al 1993, Ievinsh and Tillberg 1995, Christmann and Frenzel 1997, Ingemarsson and Bollmark 1997. It is either converted to ethylene by ACC oxidase or conjugated to malonyl-ACC (MACC) by ACC malonyltransferase (Abeles et al 1992, Martin and or to glutamyl-ACC (GACC) by ACC-γ-glutamyltranspeptidase .…”

Section: Introductionmentioning

confidence: 99%

“…1-Amino-cyclopropane-1-carboxylic acid oxidase activity, measured as the ability to convert ACC to ethylene, has been observed in many conifers (Chen et al 1990, Chen and Welburn 1991, Ievinsh and Tillberg 1995, Ingemarsson and Bollmark 1997, Kruzmane and Ievinch 1999, Reynolds and John 2000. There is also evidence that conifers contain conjugated ACC (Yang et al 1993, Christmann and Frenzel 1997, Ingemarsson and Bollmark 1997. However, reports concerning the presence of ACC malonyltransferase, MACC, GACC and ACC-glutamyltranspeptidase in conifers are lacking.…”

Section: Introductionmentioning

confidence: 99%

Ethylene metabolism in Scots pine (Pinus sylvestris) shoots during the year

2002

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Ethylene evolution, concentrations of 1-aminocyclopropane-1-carboxylic acid (ACC) and ACC conjugates, activities of ACC synthase and ACC oxidase, and cambial growth as measured by tracheid production were monitored from November to July in 1-year-old shoots, and between July and September in current-year shoots, of Scots pine (Pinus sylvestris L.). Needles, buds and four stem parts (cortex, phloem, cambial region and mature xylem) were surveyed. Ethylene evolution was quantified by gas chromatography. Free ACC and bound ACC (after acidic hydrolysis of ACC conjugates) were quantified by combined gas chromatography-mass spectrometry, with [2H]ACC as an internal standard. Activities of ACC synthase and ACC oxidase were measured in crude protein extracts. We detected high activities of ACC synthase in needles and buds, but not in stem fractions except the phloem. In July, during the period of intensive shoot growth, we found ACC only in buds and needles. In contrast, ACC oxidase activity was high in stem tissues, particularly in the cambial region during the period of rapid tracheid production, but no ACC oxidase activity was detected in needles and buds. Nevertheless, needles evolved large amounts of ethylene. Ethylene was produced by all stem fractions, and the peak rate of ethylene evolution in the cambial region coincided with the period of maximal tracheid production. Conjugated ACC was present in every fraction except mature xylem. The concentration of conjugated ACC decreased when rates of tracheid production and ethylene evolution were high, suggesting that conjugated ACC may serve as a source for ACC in the cambial region. The regulation of ethylene biosynthesis in Scots pine shoots is discussed.

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The quantification of 1-(malonylamino)cyclopropane-1-carboxylic acid in plant tissues by quantitative mass spectrometry

1996

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A method for the quantitation of I-(malonylamino)cyclopropane-1-carboxylic acid (MACC), a conjugated form of l-aminocyclopropane-1-carboxylic acid (ACC), in plants is described. [2,2,3,3-2H4]MACC has been used as an internal standard for selected ion monitoring/isotope dilution quantitation of MACC in wheat seedlings and in tomato leaves. This method is compared with a widely-used two step indirect assay for MACC, which is based upon hydrolysis of MACC to ACC and conversion of ACC by hypochlorite reagent to ethylene which is subsequently quantified by gas chromatography.

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Studies on the diurnal courses of the contents of abscisic acid, 1-aminocyclopropane carboxylic acid and its malonyl conjugate in needles of damaged and undamaged spruce trees

Cited by 10 publications

References 13 publications

Stomatal regulation prevents plants from critical water potentials during drought: Result of a model linking soil–plant hydraulics to abscisic acid dynamics

Stomatal regulation prevents plants from critical water potentials during drought: Result of a model linking soil–plant hydraulics to abscisic acid dynamics

Ethylene metabolism in Scots pine (Pinus sylvestris) shoots during the year

The quantification of 1-(malonylamino)cyclopropane-1-carboxylic acid in plant tissues by quantitative mass spectrometry

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