The Effects of Temperature and ABA on Stomata of<i>Zea mays</i>L.

Rodriguez, J. L.; Davies, W. J.

doi:10.1093/jxb/33.5.977

Cited by 64 publications

(34 citation statements)

References 17 publications

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“…Such comparisons indicate that differences in plant ionchannel kinetics may be species-dependent and highlight the need for comparative electrophysiological studies of cell types in other species, such as V. faba. The kinetics of changes in stomatal aperture are generally faster in grasses than in non-grass species (Raschke 1972;Rodriguez and Davies 1982;Johnsson et al 1976;Grantz and Zeiger 1986;Vavasseur et al 1988Vavasseur et al , 1990Karlsson et al 1990). In order to evaluate the implications of K § kinetics vis-a-vis rates of stomatal response in the intact leaf it will be necessary to obtain additional information on rates of membrane hyperpolarization and depolarization, since such voltage changes regulate both channel activation and the extent of associated ion flux.…”

Section: Discussionmentioning

confidence: 99%

Whole-cell K+ current across the plasma membrane of guard cells from a grass: Zea mays

Fairley-Grenot

Assmann

1992

Planta

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Knowledge of ion fluxes in the dumbell-shaped guard cells of grass species has been limited by the difficulty of obtaining isolated epidermes or guard-cell protoplasts for use in radioactive-tracer or electrophysiological studies. We describe here a method for isolating guard-cell protoplasts from Zea mays L. Whole-cell patch clamp has been used to measure K(+)-channel current across the plasma membrane surrounding these protoplasts. Two populations of K(+)-permeable channels have been identified. Hyperpolarization of the membrane to potentials (Vm) more negative than -100 mV results in inward K(+) current through one population of channels. Inward current activation is faster than in the dicotyledon, Vicia faba L. (mean activation half-time 26 ms (Z. mays) versus 123 ms (V. faba) at Vm=-180 mV). Steady-state current density is less than in V. faba (-22 μA · cm(-2) (Z. mays) versus -40 μA · cm(-2) (V. faba) at Vm=- 180 mV in 12 mM external K(+)). Depolarization of the membrane to potentials more positive than -20 mV results in outward K(+) current through a second population of channels; these channels activate and (upon repolarization of the membrane) deactivate more slowly than in V. faba (mean activation half-time 375 ms (Z. mays) versus 187 ms (V. faba) at Vm=+ 80 mV) but result in a similar steady-state current density (23.8 μA · cm(-2) (Z. mays) versus 28.7 μA · cm(-2) (V. faba) at Vm= + 80 mV with 105 mM internal K(+)). Omission of K(+) eliminates the current. The K(+) current is sensitive to both internal and external Ca(2+) concentration: increasing internal Ca(2+) from 2 nM to 0.2 μM or increasing external Ca(2+) from 1 mM to 8.5 mM reduces the magnitude of both inward and outward current.

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Section: Discussionmentioning

confidence: 99%

Whole-cell K+ current across the plasma membrane of guard cells from a grass: Zea mays

Fairley-Grenot

Assmann

1992

Planta

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“…Stomatal responses to ABA can also be suppressed or even reversed by other stresses (e.g. chilling –Rodriguez & Davies 1982; Wilkinson, Clephan & Davies 2001), or by developmental cues (leaf aging –Atkinson et al. 1989–Fig.…”

Section: Interactions Between Drought and Ozone Stressmentioning

confidence: 99%

Drought, ozone, ABA and ethylene: new insights from cell to plant to community

Wilkinson¹,

Davies²

2010

Plant Cell & Environment

629

376

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Recent reports show ethylene-dependent reductions in stomatal sensitivity to abscisic acid (ABA) under ozone stress. These changes reduce stomatal control of plant water loss in drying soil. Here we review evidence that ABA and ethylene, and interactions between these two stress-induced hormones, control many of the responses of intact plants to drought and ozone stress, with emphasis on effects on stomata and shoot growth. We draw attention to convergent signalling and response pathways induced by ozone and drought that can increase production of hydrogen peroxide (H2O2) and nitric oxide (NO). Stomatal responses to a wider range of stresses and developmental cues may also be controlled via the same sets of signalling pathways. Other hormones, or effectors such as xylem/apoplastic pH or changes in plant water status, also play a role in signalling within and between organs. We discuss the implications, for crops, natural ecosystems and water catchment processes, of ethylene's antagonism of the stomatal response to ABA, against a back-drop of predictions for reduced precipitation and increasing ozone pollution, as part of global climate change and increasing urbanization and industrial development.

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“…For Z. mays the results appear equivocal. At chilling temperatures, stomatal conductance can increase (Rodriguez and Davies 1982), which explains why the relative water content of leaves drops during chilling even though the leaf-air water vapor pressure deficit is low (Aguilera et al 1999). However, leaves subjected to a transient low temperature treatment showed a C i on return to warm temperatures that was ca.…”

Section: Introductionmentioning

confidence: 99%

Potential mechanisms of low-temperature tolerance of C4 photosynthesis in Miscanthus � giganteus: an in vivo analysis

Naidu

Long

2004

Planta

107

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Miscanthus x giganteus (Greef & Deuter ex Hodkinson & Renvoize) is unique among C4 species in its remarkable ability to maintain high photosynthetic productivity at low temperature, by contrast to the related C4 NADP-malic enzyme-type species Zea mays L. In order to determine the in vivo physiological basis of this difference in photosynthesis, water vapor and CO2 exchange and modulated chlorophyll fluorescence were simultaneously monitored on attached leaf segments from plants grown and measured at 25/20 degrees C or 14/11 degrees C (day/night temperature). Analysis of the response of photosynthesis to internal CO2 concentration suggested that ribulose bisphosphate carboxylase/oxygenase (Rubisco) and/or pyruvate orthophosphate dikinase (PPDK) play a more important role in determining the response to low temperature than does phosphoenolpyruvate carboxylase (PEPc). For both species at both temperatures, the linear relationship between operating efficiency of whole-chain electron transport through photosystem II (Phi(PSII)) and the efficiency of CO2 assimilation (Phi(CO2)) was unchanged and had a zero intercept, suggesting the absence of non-photosynthetic electron sinks. The major limitation at low temperature could not be solely at Rubisco or at any other point in the Calvin cycle, since this would have increased leakage of CO2 to the mesophyll and increased Phi(PSII)/Phi(CO2). This in vivo analysis suggested that maintenance of high photosynthetic rates in M. x giganteus at low temperature, in contrast to Z. mays, is most likely the result of different properties of Rubisco and/or PPDK, reduced susceptibility to photoinhibition, and the ability to maintain high levels of leaf absorptance during growth at low temperature.

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The Effects of Temperature and ABA on Stomata ofZea maysL.

Cited by 64 publications

References 17 publications

Whole-cell K+ current across the plasma membrane of guard cells from a grass: Zea mays

Whole-cell K+ current across the plasma membrane of guard cells from a grass: Zea mays

Drought, ozone, ABA and ethylene: new insights from cell to plant to community

Potential mechanisms of low-temperature tolerance of C4 photosynthesis in Miscanthus � giganteus: an in vivo analysis

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