Investigation of Plant Water Relations with Divided Root Systems of Soybean

Michel, Burlyn E.; El‐Sharkawi, H. M.

doi:10.1104/pp.46.5.728

Cited by 18 publications

(9 citation statements)

References 20 publications

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“…Lawlor (1973) found that the growth of seminal roots of wheat (Triticum aestivum cv Kolobri) decreased with decrease in osmotic potential of PEG 1500 and stopped completely at -1.0 MPa. Similar reductions in root elongation due to osmotic stress by PEG have been reported by other authors (Coutts, 1982;Kawasaki et al, 1983;Michel and El Sharkawi, 1970). Newman (1966) showed that the growth of individual roots of flax (Linum usitatissimum) was a function of the water potential of the soil close to the root tips.…”

Section: Introductionsupporting

confidence: 79%

Growth of seedling roots in response to external osmotic stress by polyethylene glycol 20,000

et al. 1992

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Seedling roots of ten plant species were grown in siliceous sand wetted with solutions of polyethylene glycol (PEG) of MW = 20,000 with osmotic potentials of 0.0, -0.25, -0.5 and -1.0 MPa. After 48 h growth under controlled lighting, root elongation and root diameter were measured.Root elongation of all species was reduced by increasing levels of external osmotic stress. Dicotyledonous species were affected more than monocotyledons at potentials of -0.25 and -0.5 MPa but less at -1.0 MPa. Root diameters of all the species were thicker than those of the unstressed at potentials of -0.25 and -0.5 MPa. At a potential of -1 . 0 M P a the dicotyledons were still thicker, though not by as much as they were at -0.25 and -0.5 MPa. The monocotyledons, in contrast, were thinner at -1.0MPa. There was a significant positive correlation (r= 0.81, p <0.01) between root diameter and root elongation at -1.0 MPa potential.Species were ranked according to the relative root elongation (RRE) and relative root thickness (RRT) at the highest level of stress (-1.0 MPa). In both rankings dicotyledonous species were in the top ranks and monocotyledous species were in lower positions. The results are compared with those for the elongation and thickening of roots growing against external mechanical stress obtained in a previous study. There were good correlations between the responses observed for the two types of external stress. The implications of these findings are discussed.

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Section: Introductionsupporting

confidence: 79%

Growth of seedling roots in response to external osmotic stress by polyethylene glycol 20,000

et al. 1992

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“…The relationship between soil water potential and flux in one part influenced soil water potential of the other part, due to apparent hydraulic connection through the root system (Simonneau & Habib 1994). When water availability in one part of the root system decreases while the other part is kept well watered, water absorption by the well‐watered roots can increase even without a decrease in leaf water potential (Michel & Elsharkawi 1970; Tan & Buttery 1982; Simonneau & Habib 1994; Sakuratani, Aoe, & Higuchi 1999). A possible hypothesis explaining increased uptake in split‐root media is the onset of a flux from root in wet to root in dry medium (Simonneau & Habib 1994), but decreased hydraulic resistance in roots is a plausible alternative hypothesis (Morizet, Cruiziat, & Falcimagne 1988).…”

Section: Introductionmentioning

confidence: 99%

Water uptake profile response of corn to soil moisture depletion

Fuchs

Cohen

et al. 2002

Plant Cell & Environment

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The effects of soil moisture distribution on water uptake of drip-irrigated corn were investigated by simultaneously monitoring the diurnal evolution of sap flow rate in stems, of leaf water potential, and of soil moisture, during intervals between successive irrigations. The results invalidate the steady-state resistive flow model for the continuum. High hydraulic capacitance of wet soil and low hydraulic conductivity of dry soil surrounding the roots damped significantly diurnal fluctuations of water flow from bulk soil to root surface. By contrast, sap flow responded directly to the large diurnal variation of leaf water potential. In wet soil, the relation between the diurnal courses of uptake rates and leaf water potential was linear. Water potential at the root surface remained nearly constant and uniformly distributed. The slope of the lines allowed calculating the resistance of the hydraulic path in the plant. Resistances increased in inverse relation with root length density. Soil desiccation induced a diurnal variation of water potential at the root surface, the minimum occurring in the late afternoon. The increase of root surface water potential with depth was directly linked to the soil desiccation profile. The development of a water potential gradient at the root surface implies the presence of a significant axial resistance in the root hydraulic path that explains why the desiccation of the soil upper layer induces an absolute increase of water uptake rates from the deeper wet layers.

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“…The overall response has been investigated using splitroot experiments (Brouwer 1953;Herkelrath, Miller & Gardner 1977;So 1979;Tan & Buttery 1982;Morizet, Cruiziat & Falcimagne 1988;Neri & Flore 1990;So & Jayasekara 1991). When one part of a root system is subjected to a decreasing water availability while the other part is well-supplied with water, absorption by the well supplied roots increases (Brouwer 1953;Michel & ElSharkawi 1970;Tan & Buttery 1982;Morizet et al 1988). This is commonly attributed to a lessening of root hydraulic resistance (Morizet et al 1988) calculated by dividing the potential difference between the leaves and the nutrient solution by the measured transpiration.…”

Section: Introductionmentioning

confidence: 99%

Water uptake regulation in peach trees with split‐root systems

Simonneau¹,

Habib²

1994

Plant Cell & Environment

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The water uptake of 3-to 4-year-old peach trees 'May-crtsilPrunus Damas' grown in an aerated nutrient solution was studied using a split-root system. Each container and the whole tree were weighed independently to measure water absorption hy hoth parts of the root system and tree transpiration. Water potential of leaves was measured with a pressure chamber. Water potential of roots was estimated using root suckers sealed in plastic hags before the measurement. The nutrient solution was removed from one container so that half the root system was left in humid air for 48 h. Water potential of roots left in solution decreased, which (partly) maintained water absorption and thus transpiration. No modification of root hydraulic resistance was required to simulate the experimental results. Nevertheless, enhancement of absorption by the roots supplied with solution cannot compensate for the water loss by transpiration. Depletion of water from the plant essentially came from the nonabsorbing roots. This was demonstrated by substituting vegetable oil for nutrient solution around one half of the split-root system, and by following the changes in root volume on the hasis of Archimedes principle. Conflicting results in the literature about apparent changes in hydraulic resistance are discussed.

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Investigation of Plant Water Relations with Divided Root Systems of Soybean

Cited by 18 publications

References 20 publications

Growth of seedling roots in response to external osmotic stress by polyethylene glycol 20,000

Growth of seedling roots in response to external osmotic stress by polyethylene glycol 20,000

Water uptake profile response of corn to soil moisture depletion

Water uptake regulation in peach trees with split‐root systems

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