Control of crops leaf growth by chemical and hydraulic influences

Puliga, Serenella; Vazzana, Concetta; Davies, W. J.

doi:10.1093/jxb/47.4.529

Cited by 27 publications

(10 citation statements)

References 17 publications

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“…In contrast, control plants grown in flooded conditions maintained comparatively high leaf productivities. Leaf sensitivity to low water conditions is fairly common in plants (Puliga et al 1996, Milnes et al 1998. In a microcosm study on drought and wetland macrophytes, both J. americana and S. cernuus had significant reductions in leaf area following simulated drought conditions, with J. americana appearing to be more sensitive than S. cernuus-as indicated by an 85% reduction in leaf area for J. americana 5 wk after experiencing a 2 wk drought .…”

Section: Discussionmentioning

confidence: 99%

Xylem potential- and water content-breakpoints in two wetland forbs: indicators of drought resistance in emergent hydrophytes

Touchette¹,

Frank²

2009

Aquat. Biol.

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Freshwater wetlands commonly occur along the boundaries between terrestrial upland and deep open-water systems, and are consequently prone to dynamic and often highly variable hydrological regimes. Physiological adaptations to drought would be advantageous in emergent vegetation, as wetlands are often susceptible to short periods of water scarcity through seasonal declines in precipitation and/or surface water runoff. This study used 15 l microcosms to examine xylem water potential (ψ xylem )-and tissue water content (θ)-breakpoints in 2 wetland forbs (Justicia americana and Saururus cernuus) to determine how these plants respond to short-term (2 wk) water deficits. Overall, treatment responses by these forbs included reductions in both θ and ψ xylem during the second week of drought, followed by rapid recoveries of θ and ψ xylem within a few days of water repletion. Rapid tissue-water recovery, following extreme water deficits (soil moisture levels < 3%), is beneficial to plants residing in areas prone to intense water fluctuations. Furthermore, while θ and ψ xylem breakpoints in S. cernuus occurred as soil moisture levels fell below 12% (ca. -800 kPa soil water potential), breakpoints for J. americana occurred at considerably lower soil moisture levels (ca. 7 and 10% soil water content for θ and ψ xylem , respectively; or less than -1500 kPa soil water potential). The lower breakpoints observed in J. americana were comparable to values reported for terrestrial grasses, including species adapted to dryer, xeric conditions. Therefore, the results from this study suggest that some wetland forbs are physiologically adapted to environments that undergo rapid changes in water hydrology, including the ability to tolerate short-term water scarcity comparable to dryer upland systems.

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Section: Discussionmentioning

confidence: 99%

Xylem potential- and water content-breakpoints in two wetland forbs: indicators of drought resistance in emergent hydrophytes

Touchette¹,

Frank²

2009

Aquat. Biol.

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“…PLANT RESPONSES TO SOIL DRYING AND RE-WATERING Leaf growth of the two species studied showed a similar sensitivity to a 15-20 day period of soil drying, both in terms of responses over time and in relation to the soil moisture contents measured. Growth of B. media and K. macrantha was moderately sensitive to soil drying compared with species studied by Puliga et al (1996). 50% and 100% inhibition of growth occurred at times and values for moisture loss intermediate between Festuca arundinacea, a temperate grass species which is sensitive to soil drying, and Eragrostis curvula, a warm-season grass in which leaf growth was comparatively insensitive to soil drying.…”

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confidence: 87%

The responses of Briza media and Koeleria macrantha to drought and re‐watering

Milnes¹,

Davies²,

Rodwell³

et al. 1998

Functional Ecology

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Summary 1.To test whether differences in response to drought can help to explain the differing distributions of Briza media and Koeleria macrantha, changes in their leaf growth and water relations during soil drying were measured. After droughting, plants were rewatered and recovery recorded. 2. Leaf growth of the two species showed a similar sensitivity to drought with respect to duration of soil drying and soil moisture content. 3. In both species tiller base relative water content (RWC) was maintained at similar levels to controls until soil moisture content had fallen to less than 9%. This may aid survival in habitats subject to periodic droughting by preventing damage to the meristems. 4. Briza media did not respond to re-watering. However, plants of K. macrantha re-grew after periods of over 20 days of drought, when tiller base RWCs had fallen as low as 13%. This ability to resurrect may explain the occurrence of K. macrantha in xeric calcicolous grasslands subject to episodes of severe droughting, from which B. media is absent.

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“…, 2004) and numerous other studies where parameters such as osmotic adjustment and leaf growth have been evaluated in a number of crop species (see for example Babu et al. , 1999; Puliga et al. , 1996).…”

Section: Experimental Techniques For Evaluating the Low‐ψw Responsementioning

confidence: 99%

Methods and concepts in quantifying resistance to drought, salt and freezing, abiotic stresses that affect plant water status

Verslues¹,

Agarwal²,

et al. 2006

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SummaryThe abiotic stresses of drought, salinity and freezing are linked by the fact that they all decrease the availability of water to plant cells. This decreased availability of water is quantified as a decrease in water potential. Plants resist low water potential and related stresses by modifying water uptake and loss to avoid low water potential, accumulating solutes and modifying the properties of cell walls to avoid the dehydration induced by low water potential and using protective proteins and mechanisms to tolerate reduced water content by preventing or repairing cell damage. Salt stress also alters plant ion homeostasis, and under many conditions this may be the predominant factor affecting plant performance. Our emphasis is on experiments that quantify resistance to realistic and reproducible low water potential (drought), salt and freezing stresses while being suitable for genetic studies where a large number of lines must be analyzed. Detailed protocols for the use of polyethylene glycol-infused agar plates to impose low water potential stress, assay of salt tolerance based on root elongation, quantification of freezing tolerance and the use of electrolyte leakage experiments to quantify cellular damage induced by freezing and low water potential are also presented.

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Control of crops leaf growth by chemical and hydraulic influences

Cited by 27 publications

References 17 publications

Xylem potential- and water content-breakpoints in two wetland forbs: indicators of drought resistance in emergent hydrophytes

Xylem potential- and water content-breakpoints in two wetland forbs: indicators of drought resistance in emergent hydrophytes

The responses of Briza media and Koeleria macrantha to drought and re‐watering

Methods and concepts in quantifying resistance to drought, salt and freezing, abiotic stresses that affect plant water status

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