Characterization of the Na<sup>+</sup>delivery from roots to shoots in rice under saline stress: Excessive salt enhances apoplastic transport in rice plants

Ochiai, Kumiko; Matoh, Tōru

doi:10.1080/00380768.2002.10409214

Cited by 39 publications

(41 citation statements)

References 26 publications

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“…2E), suggesting the presence of a physiological barrier other than the Casparian band. This barrier was also observed in a previous study, although its nature has not been identified (Ochiai and Matoh, 2002). Therefore, a much lower Si uptake in the root tip zone could be ascribed to both the absence of the Si transporter Lsi1 and the presence of a physiological barrier.…”

Section: Effect Of Dehydration Stress and Abscisic Acid On Lsi1 Exprementioning

confidence: 53%

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Spatial Distribution and Temporal Variation of the Rice Silicon Transporter Lsi1

2007

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Section: Effect Of Dehydration Stress and Abscisic Acid On Lsi1 Exprementioning

confidence: 53%

“…This dye has been used as a tracer of apoplastic solute flow in the roots (Ochiai and Matoh, 2002). At 3 mm from the tip, fluorescence was only observed at the outside of the epidermal cells (Fig.…”

Section: Spatial Distribution Of Lsi1 In Relation To Development Of Amentioning

confidence: 99%

Spatial Distribution and Temporal Variation of the Rice Silicon Transporter Lsi1

2007

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“…However, as described in the previous section, studies using apoplastic tracer showed that major pathway of uptaking Na + ions into the stele is apoplastic pathway in the case of rice (Yeo et al [1987]; Yadav et al [1996]; Ochiai and Matoh [2002]).…”

Section: Introductionmentioning

confidence: 99%

Salinity tolerance mechanisms in glycophytes: An overview with the central focus on rice plants

Horie

Karahara

Katsuhara

2012

Rice

334

183

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Elevated Na+ levels in agricultural lands are increasingly becoming a serious threat to the world agriculture. Plants suffer osmotic and ionic stress under high salinity due to the salts accumulated at the outside of roots and those accumulated at the inside of the plant cells, respectively. Mechanisms of salinity tolerance in plants have been extensively studied and in the recent years these studies focus on the function of key enzymes and plant morphological traits. Here, we provide an updated overview of salt tolerant mechanisms in glycophytes with a particular interest in rice (Oryza sativa) plants. Protective mechanisms that prevent water loss due to the increased osmotic pressure, the development of Na+ toxicity on essential cellular metabolisms, and the movement of ions via the apoplastic pathway (i.e. apoplastic barriers) are described here in detail.Electronic supplementary materialThe online version of this article (doi:10.1186/1939-8433-5-11) contains supplementary material, which is available to authorized users.

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“…This agrees with the results of recent studies (Fritz et al 2010, Knipfer andFricke 2010), which used different methods to prove that reflection coefficients of cereal roots for small solutes are close to unity. The same conclusion may be drawn from the absence of a significant solvent drag to NaCl, sugars and mannitol at high rates of water uptake in studies with intact root systems of different plants (Perry and Greenway 1973, Munns 1985, Tsuchiya et al 1984, Ochiai and Matoh 2002, Fritz and Ehwald 2011.…”

Section: Discussionmentioning

confidence: 58%

Visualisation of xylem sap flow direction in isolated fine lateral roots and estimation of the xylem sap osmotic potential

Fritz¹,

Ehwald²

2012

Biologia plant.

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Xylem sap outflow from fine lateral roots (FLRs) isolated from hydroponically grown young maize (Zea mays L.) plants was visualized by local brightening of test solutions contrasted with purified Indian ink particles. Flow into the vessels was indicated by the adsorption of Evans Blue in their walls. The fraction of the FLRs able to exude xylem sap in a mineral medium with 30 mM mannitol decreased with increasing incubation time. This change was strongly retarded, when the FLRs were incubated in a medium containing glucose instead of mannitol. There was a broad range of variation of the osmotic potential of the test solutions (Ψ so ), wherein the fraction of the FLRs showing an initially reversed flow of the xylem sap varied between zero and unity. A median (M) of the osmotic potential of the xylem sap in FLRs (Ψ sx ) was estimated. It represents the value of Ψ so that was lower than Ψ sx in half of the roots of a sample before their transfer to the test solutions (Ψ sxo ). M was dependent on the osmotic potential of the medium used for growth or pre-incubation of the FLRs. Its value was not dependent on the molecular size of the osmolytes used to adjust Ψ so , including dextran 8, which is excluded from cell walls. In all of the studied plants, M was lower than the osmotic potential of the xylem sap collected from the root before isolation of the FLRs. To explain this finding it is assumed that FLRs with Ψ sxo > M had a higher hydraulic conductivity and a larger volume contributed to the exuded sap than those with Ψ sx < M.

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Characterization of the Na⁺delivery from roots to shoots in rice under saline stress: Excessive salt enhances apoplastic transport in rice plants

Cited by 39 publications

References 26 publications

Spatial Distribution and Temporal Variation of the Rice Silicon Transporter Lsi1

Spatial Distribution and Temporal Variation of the Rice Silicon Transporter Lsi1

Salinity tolerance mechanisms in glycophytes: An overview with the central focus on rice plants

Visualisation of xylem sap flow direction in isolated fine lateral roots and estimation of the xylem sap osmotic potential

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Characterization of the Na+delivery from roots to shoots in rice under saline stress: Excessive salt enhances apoplastic transport in rice plants

Cited by 39 publications

References 26 publications

Spatial Distribution and Temporal Variation of the Rice Silicon Transporter Lsi1

Spatial Distribution and Temporal Variation of the Rice Silicon Transporter Lsi1

Salinity tolerance mechanisms in glycophytes: An overview with the central focus on rice plants

Visualisation of xylem sap flow direction in isolated fine lateral roots and estimation of the xylem sap osmotic potential

Contact Info

Product

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Characterization of the Na⁺delivery from roots to shoots in rice under saline stress: Excessive salt enhances apoplastic transport in rice plants