Nitrogen availability affects hydraulic conductivity of rice roots, possibly through changes in aquaporin gene expression

Ishikawa–Sakurai, Junko; Hayashi, Hideharu; Murai-Hatano, Mari

doi:10.1007/s11104-014-2070-4

Cited by 50 publications

(39 citation statements)

References 34 publications

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“…In our previous study, a high N (mixture of NH 4 + and NO 3 − ) supply enhanced aquaporin (AQP) expression and decreased root aerenchyma and lignin, resulting in a high water absorption rate [44], which was consistent with results that show that high N supply increases root hydraulic conductivity and AQP expression in rice plants [43]. The possible mechanisms of aquaporin regulated hydraulic conductivity in response to N availability may be attributed to the changes in aquaporin abundance and activity [43]. Aquaporins play an important role in N absorption, mobilization, and detoxification, as well as other nitrogen metabolic processes in higher plants [23].…”

Section: Nitrogen (N)supporting

confidence: 83%

The Interactions of Aquaporins and Mineral Nutrients in Higher Plants

Wang

Ding

Gao

et al. 2016

IJMS

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Aquaporins, major intrinsic proteins (MIPs) present in the plasma and intracellular membranes, facilitate the transport of small neutral molecules across cell membranes in higher plants. Recently, progress has been made in understanding the mechanisms of aquaporin subcellular localization, transport selectivity, and gating properties. Although the role of aquaporins in maintaining the plant water status has been addressed, the interactions between plant aquaporins and mineral nutrients remain largely unknown. This review highlights the roles of various aquaporin orthologues in mineral nutrient uptake and transport, as well as the regulatory effects of mineral nutrients on aquaporin expression and activity, and an integrated link between aquaporins and mineral nutrient metabolism was identified.

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Section: Nitrogen (N)supporting

confidence: 83%

The Interactions of Aquaporins and Mineral Nutrients in Higher Plants

Wang

Ding

Gao

et al. 2016

IJMS

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“…OsPIP2;5 also showed the highest correlation to the diurnal pattern in root hydraulic conductivity (Sakurai-Ishikawa et al, 2011), to acclimation of root hydraulic conductivity under continuous low root temperature (Ahamed et al, 2012), and to down-and upregulation of root hydraulic conductivity during and after nitrogen deprivation (Ishikawa- Sakurai et al, 2014). Overall, these results suggest that OsPIP2;5 plays a crucial role in regulating water uptake across roots in a fluctuating environment.…”

Section: Individual Roles Of Root Aquaporinsmentioning

confidence: 72%

Rice Plants Sense Daily Weather and Regulate Aquaporin Gene Expressions in the Roots -Close correlation with potential evaporation-

Murai-Hatano

Kuwagata

Hayashi

et al. 2015

J. Agric. Meteorol.

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Transpiration, the evaporation from aerial parts of plants, is major driving force for the roots to uptake water from the soil. Aquaporins, the water channel proteins, are thought to play crucial roles in regulation of root hydraulic conductivity. Here we demonstrate that the evaporative demand plays a dominant role in the induction of specific aquaporins in rice (Oryza sativa) roots in seedlings grown hydroponically and then transferred to an open field. We found that the abundance of the root-specific aquaporin transcripts, OsPIP2;4, OsPIP2;5 and OsTIP2;1 at 8 a.m. is highly correlated with the evaporative demand in the morning (evaluated from potential evaporation averaged over 4 h before root sampling). Aquaporin isoforms with higher correlation to potential evaporation showed higher diurnal amplitude of their expression. Our study suggests that rice plants sense daily weather and responded to it by adjusting the expression of specific root aquaporin genes.

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“…Furthermore, experimental evidence suggests that mass flow in itself may be stimulated by soil‐N availability. Root hydraulic resistance is, in the short term, regulated by the expression and activity of aquaporins, and there is evidence to suggest that soil‐N availability affects both root aquaporin activity and hydraulic conductivity (Gorska et al ., ; Hacke et al ., ; Ishikawa‐Sakurai et al ., ; Ren et al ., ). The inference is that, under conditions of adequate soil water and soil‐N availabilities, mass flow and root‐N uptake capacity may be regulated in concert to enhance N acquisition from soil.…”

Section: Discussionmentioning

confidence: 99%

Quantifying the contribution of mass flow to nitrogen acquisition by an individual plant root

McMurtrie

Näsholm

2017

New Phytologist

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The classic model of nitrogen (N) flux into roots is as a Michaelis-Menten (MM) function of soil-N concentration at root surfaces. Furthermore, soil-N transport processes that determine soil-N concentration at root surfaces are seen as a bottleneck for plant nutrition. Yet, neither the MM relationship nor soil-N transport mechanisms are represented in current terrestrial biosphere models. Processes governing N supply to roots - diffusion, mass flow, N immobilization by soil microbes - are incorporated in a model of root-N uptake. We highlight a seldom considered interaction between these processes: nutrient traverses the rhizosphere more quickly in the presence of mass flow, reducing the probability of its immobilization before reaching the root surface. Root-N uptake is sensitive to the rate of mass flow for widely spaced roots with high N uptake capacity, but not for closely spaced roots or roots with low uptake capacity. The results point to a benefit of root switching from high- to low-affinity N transport systems in the presence of mass flow. Simulations indicate a strong impact of soil water uptake on N delivery to widely spaced roots through transpirationally driven mass flow. Furthermore, a given rate of N uptake per unit soil volume may be achieved by lower root biomass in the presence of mass flow.

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Nitrogen availability affects hydraulic conductivity of rice roots, possibly through changes in aquaporin gene expression

Cited by 50 publications

References 34 publications

The Interactions of Aquaporins and Mineral Nutrients in Higher Plants

The Interactions of Aquaporins and Mineral Nutrients in Higher Plants

Rice Plants Sense Daily Weather and Regulate Aquaporin Gene Expressions in the Roots -Close correlation with potential evaporation-

Quantifying the contribution of mass flow to nitrogen acquisition by an individual plant root

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