Evaluation of a System for the Imposition of Plant Water Stress

Snow, Michael D.; Tingey, David T.

doi:10.1104/pp.77.3.602

Cited by 48 publications

(46 citation statements)

References 22 publications

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“…6); secondly, leaf water potential (ψ L ) values in Table 2 represent only the minimum stress that these plants experienced during the day. For a drought treatment similar to ours (water table at 20 cm) in a cooler, less illuminated environment, Snow and Tingey (1985) reported a dawnto-midday drop in sunflower ψ L of c. 0.4 MPa. From this, we infer that daytime ψ L during our experiment was ≤1 MPa even in the moderate-drought treatment.…”

Section: Discussionmentioning

confidence: 99%

“…Plants were grown free of competition, with individuals kept in separate pots, and subjected to one of three drought intensities. Drought was imposed using a modification of the method proposed by Haan and Barfield (1971), as described by Snow and Tingey (1985), which overcomes the first two experimental constraints of plant-soil water interactions described in the Introduction. The third constraint was overcome by our choice of eight species belonging to the same family and having the same perennial growth habit and photosynthetic pathway.…”

Section: Methodsmentioning

confidence: 99%

“…Diagram of the drought-imposing method, based on Snow and Tingey (1985) [C 20-l plastic container, F hygroscopic foam, N nutrient solution, a,b,c,d 0.7-l, sand-filled pots with a nylon mesh at the bottom (4 more pots were at the back), z water-table depth (different for different treatments, see Table 2)]…”

Section: Figmentioning

confidence: 99%

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Potential growth and drought tolerance of eight desert grasses: lack of a trade-off?

2000

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Eight perennial C-4 grasses from the Jornada del Muerto Basin in southern New Mexico show five-fold differences in relative growth rates under well- watered conditions (RGR). In a controlled environment, we tested the hypothesis that there is an inverse relationship (trade-off) between RGR and the capacity of these species to tolerate drought. We examined both physiological (gas exchange) and morphological (biomass allocation, leaf properties) determinants of growth for these eight species under three steady-state drought treatments (none=control, moderate, and severe). When well watered, the grasses exhibited a large interspecific variation in growth, which was reflected in order-of-magnitude biomass differences after 5 weeks. The species had similar gas-exchange characteristics, but differed in all the measured allocation and morphological characteristics, namely tiller mass and number, root:shoot ratio, dry-matter content, and specific leaf area (SLA). Drought affected tillering, morphology, and allocation, and reduced growth by 50 and 68% (moderate and severe drought, respectively) compared to the well-watered controls. With the exception of SLA, none of these variables showed a significant species-by-treatment interaction. We calculated three indices of drought tolerance, defined as the ratio in final biomass between all the possible "dry"/"wet" treatment pairs: severe/moderate, moderate/control, and severe/control. We found no significant correlation between these drought tolerance indices, on the one hand, and three indices of growth potential (greenhouse RGR, final biomass in the control treatment, and final:initial biomass ratio in controls), on the other. Based on these controlled-environment results, we hypothesize that the commonly reported correlation between plant growth potential and drought tolerance in the field may in some cases be explained by differential effects of plants on soil-water content rather than by differences in species responses to drought.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Potential growth and drought tolerance of eight desert grasses: lack of a trade-off?

2000

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“…All plants had been kept well watered during two weeks until treatments of drought began. Drought was imposed using a modification of the method proposed by Snow and Tingey (1985), as described by Fernández and Reynolds (2000). This procedure ensures that drought intensity becomes independent of plant size.…”

Section: Plant Culturementioning

confidence: 99%

Xylem efficiency vs. safety: Acclimation to drought of seedling root anatomy for six Patagonian shrub species

Durante

Maseda

Fernández

2011

Journal of Arid Environments

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“…A self-regulating subsoil watering system based on the Snow and Tingey (1985) system, modified by Wookey et al (1991) to incorporate a 'flask of Mariotte' (Fig. 1), was used to control the water content of the potting medium.…”

Section: Watering Systemmentioning

confidence: 99%

A hierarchical analysis of the interactive effects of elevated CO2 and water availability on the nitrogen and transpiration productivities of velvet mesquite seedlings

Peterson

Neofotis

2004

Oecologia

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In this study we apply new extensions of classical growth analysis to assess the interactive effects of elevated CO2 and differences in water availability on the leaf-nitrogen and transpiration productivities of velvet mesquite (Prosopis velutina Woot.) seedlings. The models relate transpiration productivity (biomass gained per mass of water transpired per day) and leaf-nitrogen productivity (biomass gain per unit leaf N per day) to whole-plant relative growth rate (RGR) and to each other, allowing a comprehensive hierarchical analysis of how physiological and morphological responses to the treatments interact with each other to affect plant growth. Elevated CO2 led to highly significant increases in N and transpiration productivities but reduced leaf N per unit leaf area and transpiration per unit leaf area, resulting in no net effect of CO2 on the RGR of seedlings. In contrast, higher water availability led to an increase in leaf-tissue thickness or density without affecting leaf N concentration, resulting in a higher leaf N per unit leaf area and consequently a higher assimilatory capacity per unit leaf area. The net effect was a marginal increase in seedling RGR. Perhaps most important from an ecological perspective was a 41% reduction in whole-plant water use due to elevated CO2. These results demonstrate that even in the absence of CO2 effects on integrative measures of plant growth such as RGR, highly significant effects may be observed at the physiological and morphological level that effectively cancel each other out. The quantitative framework presented here enables some of these tradeoffs to be identified and related directly to each other and to plant growth.

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Evaluation of a System for the Imposition of Plant Water Stress

Abstract: A system which imposes a range of water stress levels was developed and evaluated. Water stress was controlled by employing a screen to suspend roots above a water column of known height. Levels

Cited by 48 publications

References 22 publications

Potential growth and drought tolerance of eight desert grasses: lack of a trade-off?

Potential growth and drought tolerance of eight desert grasses: lack of a trade-off?

Xylem efficiency vs. safety: Acclimation to drought of seedling root anatomy for six Patagonian shrub species

A hierarchical analysis of the interactive effects of elevated CO2 and water availability on the nitrogen and transpiration productivities of velvet mesquite seedlings

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