Seasonal changes in stomatal responses of sweet cherry and plum to water status in detached leaves

Yoon, Tae-Myung; Richter, Hanno

doi:10.1111/j.1399-3054.1990.tb05673.x

Cited by 18 publications

(7 citation statements)

References 30 publications

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“…Both parameters were linearly correlated (r = 0.87***, data not shown), which suggested a limitation in the photosynthetic capacity under water stress conditions [11]. Similar relationships between Pn and g l have been reported for other Prunus species [12,13], indicating an efficient co-ordination of stomatal behaviour and photosynthetic activity [14].…”

Section: Preconditioning Periodsupporting

confidence: 56%

Water stress preconditioning to improve drought resistance in young apricot plants

et al. 2000

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The effect of water stress preconditioning was studied in one-year-old apricot plants (Prunus armeniaca L., cv. Búlida). Plants were submitted to different treatments: T-0 (control treatment) and T-1, drip irrigated daily; T-2 and T-3, irrigated daily at 50% and 25% of T-0, respectively; T-4 and T-5, irrigated to field capacity every 3 and 6 days, respectively. After 30 days, irrigation was withheld for 10 days, maintaining the T-0 treatment irrigated daily. After this period, the plants were re-irrigated to run-off and treated as control treatment. The stomatal closure and epinasty observed in response to water stress represented adaptive mechanisms to drought, allowing the plants to regulate water loss more effectively and prevent leaf heating. A substantial reduction in the irrigation water supplied combined with a high frequency of application (T-3 treatment) promoted plant hardening; the plants enduring drought better, due to their greater osmotic adjustment (0.77 MPa), which prevented severe plant dehydration and leaf abscission. Such a preconditioning treatment may be valuable for young apricot plants in the nursery stage in order to improve their subsequent resistance to drought. A 50% reduction in daily irrigation (T-2 treatment) did not significantly affect either gas exchange rates or leaf turgor, which suggests that water should be applied frequently if deficit irrigation is to be implemented. Keywords: Gas exchange; Osmotic adjustment; Plant hardening; Prunus armeniaca; Water relations; Water stress.Abbreviations: g l , leaf conductance LIA, leaf insertion angle; Pn, net photosynthesis; Tc-Ta, canopy to air temperature difference; TDR, time domain reflectometry; θ v , volumetric soil water content; Ψ m , soil matric potential; Ψ md , mid-day leaf water potential; Ψ o , leaf osmotic potential; Ψ os , leaf osmotic potential at full turgor; Ψ p , leaf turgor potential; Ψ pd , pre-dawn leaf water potential.

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Section: Preconditioning Periodsupporting

confidence: 56%

Water stress preconditioning to improve drought resistance in young apricot plants

et al. 2000

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“…The decrease in leaf osmotic potential at full saturation ( os ) from March to October (Table 2) can be attributed to the accumulation of osmotically active solutes with ageing, a characteristic of deciduous trees (Lakso et al 1984, Yoon andRichter 1990), and supported by the seasonal decrease in the values of the water saturated mass/dry mass ratio (Table 2). No significant differences were observed in os values between the control and deficit treatments, because plant water deficits must be severe ( w < -1.5 MPa at predawn) Table 2.…”

Section: Resultsmentioning

confidence: 96%

“…Osmotic potential at full saturation ( os ) was measured on leaves adjacent to those used to measure predawn leaf water potential. Eight leaves per treatment were allowed to reach full p by dipping their petioles in distilled water for 24 h in darkness at 8 ºC (Yoon and Richter 1990). The rehydrated leaves were weighed (water saturated mass) and frozen in liquid nitrogen, and then os was measured following the same methodology as for o .…”

Section: Methodsmentioning

confidence: 99%

Daily variations in water relations of apricot trees under different irrigation regimes

Ruiz-Sánchez¹,

Miguel²,

Pérez‐Pastor³

2007

Biologia plant.

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Mature apricot (Prunus armeniaca L. cv. Búlida) trees, growing under field conditions, were submitted to two drip irrigation treatments: a control (T1), irrigated to 100 % of seasonal crop evapotranspiration (ETc), and a continuous deficit (T2), irrigated to 50 % of the control throughout the year. The behaviour of leaf water potential and its components, leaf conductance and net photosynthesis were studied at three different times during the growing season, when they revealed a diurnal and seasonal pattern in response to water stress, evaporative demand of the atmosphere and leaf age. The deficit-irrigated trees showed, among other effects, a pronounced decrease in leaf water potential ( w ), decreased in leaf conductance (g s ) and no osmotic adjustment. For this reason, g l and w can be considered good indicators of mature apricot tree water status and can therefore be used for irrigation scheduling.Additional key words: leaf stomatal conductance, leaf water potential, net photosynthesis, Prunus armeniaca L., water deficit.

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“…For instance, gas exchange has been significantly related to tissue water relations (i.e. osmotic adjustment) in some studies (Yoon andRichter 1990, Ranney et al 1991), but not in others (Hinckley et al 1979, Kubiske andAbrams 1994). Conversely, relationships between gas exchange and leaf water potential seem more consistent than those of gas exchange vs. tissue-water relations (Bahari et al 1985, Ellsworth andReich 1992).…”

Section: Introductionmentioning

confidence: 99%

Contribution of physiological and morphological adjustments to drought resistance in two Mediterranean tree species

Serrano¹,

Peñuelas²

2005

Biologia plant.

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Plant water potential (ψ), its components, and gas exchange data of two Mediterranean co-occurring woody species (Quercus ilex L. and Phillyrea latifolia L.) were measured in response to seasonal changes in water availability over two consecutive years. The relative contribution of physiological and morphological adjustments to drought resistance was assessed through Principal Component Analyses. There were large adjustments in stomatal conductance (~36 % of accounted variance). Net photosynthetic rate and water use efficiency were closely tuned to water availability and accounted for ~17 % of variance. The slope of the water potential vs. relative water content (dψ/dRWC 0 ) below zero pressure potential increased as a result of seasonal and ontogenic increases in apoplastic water fraction and accounted for ~20 % variance. This tolerance mechanism was accompanied by an increased range of positive pressure potential, suggesting a functional role of sclerophylly in these Mediterranean evergreens. Similarly, changes in the slope of dψ/dRWC in the range of positive pressure potential (~13 % of accounted variance) were associated to variations in cell wall elasticity and resulted in lower RWC at zero pressure potential. When considering the species studied separately, the results indicated the primary role of stomatal regulation in the drought resistance of Q. ilex, while increased apoplastic water fraction had a major contribution in the drought resistance of P. latifolia.Additional key words: drought stress, Phillyrea latifolia, net photosynthetic rate, plant and tissue-water relations, Quercus ilex, stomatal conductance, water potential.

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Seasonal changes in stomatal responses of sweet cherry and plum to water status in detached leaves

Cited by 18 publications

References 30 publications

Water stress preconditioning to improve drought resistance in young apricot plants

Water stress preconditioning to improve drought resistance in young apricot plants

Daily variations in water relations of apricot trees under different irrigation regimes

Contribution of physiological and morphological adjustments to drought resistance in two Mediterranean tree species

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