Maize stomatal conductance in the field: its relationship with soil and plant water potentials, mechanical constraints and ABA concentration in the xylem sap

Tardieu, F.; Katerji, Nader; Bethenod, Olivier; Zhang, Jianhua; Davies, W. J.

doi:10.1111/j.1365-3040.1991.tb01378.x

Cited by 104 publications

(61 citation statements)

References 24 publications

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“…Stomata (180-250) belonging to five to six pieces were examined in each treatment. The experiment was carried out three times on different batches of plants, the last experiment being repeated on 2 consecutive d. We define the sensitivity of (25,27). To achieve this, part of the field was irrigated, part was left unwatered, and part was compacted before sowing and left unwatered afterward.…”

Section: Methodsmentioning

confidence: 99%

Stomatal Response to Abscisic Acid Is a Function of Current Plant Water Status

Tardieu¹,

Davies²

1992

Plant Physiol.

287

165

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We investigated, under laboratory and field conditions, the possibility that increasing abscisic acid (ABA) concentrations and decreasing water potentials can interact in their effects on stomata. One experiment was carried out with epidermal pieces of Commelina communis incubated in media with a variety of ABA and polyethylene glycol concentrations. In the media without ABA, incubation in solutions with water potentials between -0.3 and -1.5 megapascals had no significant effect on stomatal aperture. Conversely, the sensitivity of stomatal aperture to ABA was trebled in solutions at -1.5 megapascals compared with sensitivity at -0.3 megapascals. The effect of the change in sensitivity was more important than the absolute effect of ABA at the highest water potential. In a field experiment, sensitivity of maize stomatal conductance to the concentration of ABA in the xylem sap varied strongly with the time of the day. We consider that the most likely explanation for this is the influence of a change in leaf or epidermal water potential that accompanies an increase in irradiance and saturation deficit as the day progresses. These observations suggest that epidermal water relations may act as a modulator of the responses of stomata to ABA. We argue that such changes must be taken into account in studies or modeling of plant responses to drought stress.Experiments with wilty mutants (2,24)

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Section: Methodsmentioning

confidence: 99%

Stomatal Response to Abscisic Acid Is a Function of Current Plant Water Status

Tardieu¹,

Davies²

1992

Plant Physiol.

287

165

View full text Add to dashboard Cite

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“…We recognize that ABA has been supported strongly as a signal in relation to water stress and compaction (Morgan, 1990;Tardieu et al, 1991;Jackson, 1993;Hartung et al, 1994). The studies that implicate ABA generally argue that any ABA response is associated with water stress that accompanies compaction, rather than with roots sensing the soil strength directly.…”

Section: Mechanism Of Responsementioning

confidence: 99%

“…Tardieu et al, 1991). The overall effect of impedance on plant growth might be expected to be greatest when a young root system is establishing itself and its entire root system is in hard soil.…”

Section: Mechanism Of Responsementioning

confidence: 99%

Mechanical impedance of root growth directly reduces leaf elongation rates of cereals

Young¹,

Montagu

Conroy

et al. 1997

New Phytologist

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SUMMARYA dry soil is generally a hard soil. Thus, the effects of water stress and mechanical impedance on plant growth are difficult to separate. To achieve this we have developed a growth cell that allows manipulation of the strength of growth media (i.e. mechanical impedance) without altering the availability of water or nutrients. We monitored leaf elongation rates of barley and wheat seedlings before and after the mechanical impedance to root growth was increased. Results show that a large and rapid reduction (within 10 min) of leaf elongation rates occurred after impedance to the roots was increased. The average reductions for barley and wheat, with associated standard errors, were 22-6% (4-84) and 36-2% (548), respectively. The data are consistent with the hypothesis that mechanical impedance of roots might have a direct negative effect on leaf growth even where nutrients and water are in plentiful supply to the plant. The implications of the rate of the response are examined with respect to the underlying mechanisms controlling root-shoot signalling.

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“…The theory of whole-plant stomatal regulation by root-sourced, nonhydraulic factors has been advanced on the basis of a few field studies (Loveys, 1984 ;Wartinger et al, 1990 ;Tardieu et al, 1991) but mostly by work with potted plants in controlled conditions. There are indications that g s and xylem sap [ABA] might be correlated in trees in field conditions (Loewenstein & Pallardy, 1998b) but additional work is needed to corroborate or refute the idea that g s of woody species in the field is typically better correlated with chemical rather than with hydraulic plant variables.…”

Section: mentioning

confidence: 99%

Correlations of stomatal conductance with hydraulic and chemical factors in several deciduous tree species in a natural habitat

et al. 2000

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Recent research in whole-plant stomatal physiology, conducted largely with potted plants in controlled environments, suggests that stomatal conductance (g s ) might be more closely linked to plant chemical variables than to hydraulic variables. To test this in a field situation, seasonal g s was examined in relation to a number of plant and environmental variables in 11 temperate, deciduous forest tree species. Stomatal conductance was generally better correlated with environmental variables (air temperature, vapor pressure deficit, PPFD) than with plant variables, and slightly better correlated with plant hydraulic variables (shoot water and osmotic potentials) than with plant chemical variables (xylem sap ABA concentration, xylem sap pH). We examined a model, developed previously for maize, which describes regulation of g s by xylem sap ABA concentration with leaf water status acting to modify stomatal sensitivity to the ABA signal. This model explained slightly more variation in seasonal g s in the forest trees than did single plant variables but not more variation than most single environmental variables. Response surface models, especially those incorporating environmental variables, were more consistently successful at explaining g s across species.

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Maize stomatal conductance in the field: its relationship with soil and plant water potentials, mechanical constraints and ABA concentration in the xylem sap

Cited by 104 publications

References 24 publications

Stomatal Response to Abscisic Acid Is a Function of Current Plant Water Status

Stomatal Response to Abscisic Acid Is a Function of Current Plant Water Status

Mechanical impedance of root growth directly reduces leaf elongation rates of cereals

Correlations of stomatal conductance with hydraulic and chemical factors in several deciduous tree species in a natural habitat

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