Osmoregulation of leaf motor cells

Moran, Nava

doi:10.1016/j.febslet.2007.04.002

Cited by 112 publications

(103 citation statements)

References 83 publications

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“…Research of motor cells in the pulvini of Mimosa pudica indicated that along with the differentiation of motor cells, the expression of both vacuolar aquaporin and H + -ATPase were increased (FleuratLessard et al, 1997). Furthermore, vacuolar H + -pyrophosphatase and H + -ATPase create the tonoplast electrochemical gradient by pumping H + into the vacuoles, which are important for osmoregulation of motor cells and osmotic adjustment in plants (Moran, 2007).…”

mentioning

confidence: 99%

SEMI-ROLLED LEAF1 Encodes a Putative Glycosylphosphatidylinositol-Anchored Protein and Modulates Rice Leaf Rolling by Regulating the Formation of Bulliform Cells

et al. 2012

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Leaf rolling is an important agronomic trait in rice (Oryza sativa) breeding and moderate leaf rolling maintains the erectness of leaves and minimizes shadowing between leaves, leading to improved photosynthetic efficiency and grain yields. Although a few rolled-leaf mutants have been identified and some genes controlling leaf rolling have been isolated, the molecular mechanisms of leaf rolling still need to be elucidated. Here we report the isolation and characterization of SEMI-ROLLED LEAF1 (SRL1), a gene involved in the regulation of leaf rolling. Mutants srl1-1 (point mutation) and srl1-2 (transferred DNA insertion) exhibit adaxially rolled leaves due to the increased numbers of bulliform cells at the adaxial cell layers, which could be rescued by complementary expression of SRL1. SRL1 is expressed in various tissues and is expressed at low levels in bulliform cells. SRL1 protein is located at the plasma membrane and predicted to be a putative glycosylphosphatidylinositol-anchored protein. Moreover, analysis of the gene expression profile of cells that will become epidermal cells in wild type but probably bulliform cells in srl1-1 by laser-captured microdissection revealed that the expression of genes encoding vacuolar H+-ATPase (subunits A, B, C, and D) and H+-pyrophosphatase, which are increased during the formation of bulliform cells, were up-regulated in srl1-1. These results provide the transcript profile of rice leaf cells that will become bulliform cells and demonstrate that SRL1 regulates leaf rolling through inhibiting the formation of bulliform cells by negatively regulating the expression of genes encoding vacuolar H+-ATPase subunits and H+-pyrophosphatase, which will help to understand the mechanism regulating leaf rolling.

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confidence: 99%

SEMI-ROLLED LEAF1 Encodes a Putative Glycosylphosphatidylinositol-Anchored Protein and Modulates Rice Leaf Rolling by Regulating the Formation of Bulliform Cells

et al. 2012

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“…. 16,17 These results suggest that regulation of these osmotic signaling events including ROS generation requires Ca 2+ influx. However, their molecular basis and regulatory mechanisms have remained poorly elucidated.…”

Section: +mentioning

confidence: 77%

Roles of a putative mechanosensitive plasma membrane Ca²⁺-permeable channel OsMCA1 in generation of reactive oxygen species and hypo-osmotic signaling in rice

Kurusu

Iida

Kuchitsu

2012

Plant Signaling & Behavior

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Keywords: calcium signaling, mechanosensitive Ca 2+ channel, hypo-osmotic stress, reactive oxygen species (ROS), riceMechanosensing and its downstream responses are speculated to involve sensory complexes containing Ca 2+ -permeable mechanosensitive channels. On recognizing hypo-osmotic stress, plant cells initiate activation of a widespread signal transduction network involving second messengers such as Ca 2+ to trigger inducible defense responses including the induction of transcriptional factors.1 However, most of the components involved in these signaling networks still remain to be identified. Recently we identified and investigated OsMCA1, the sole homolog of the MCA family putative Ca 2+ -permeable mechanosensitive channels in rice. Functional characterization of the OsMCA1-suppressed cells as well as the overexpressing cells indicated that OsMCA1 is involved in the regulation of plasma membrane Ca 2+ influx and NADPH oxidase-mediated generation of reactive oxygen species (ROS) induced by hypo-osmotic stress. Here we will discuss possible molecular mechanisms and physiological functions of the MCA protein in hypo-osmotic signaling.

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“…Circadian and light-induced leaf movements of several plants are due to changes in turgor pressure in specialized motor cells that are part of flexible hinges (so-called pulvini) located at the base of the stalk of the leaf (Iino et al 2001;Moran 2007). A similar mechanism, but with a rapid movement, is well known for mimosa, which folds its leaves upon external stimuli.…”

Section: (B ) Turgor Pressurementioning

confidence: 99%

Actuation systems in plants as prototypes for bioinspired devices

Burgert

Fratzl

2009

Phil. Trans. R. Soc. A.

311

278

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Plants have evolved a multitude of mechanisms to actuate organ movement. The osmotic influx and efflux of water in living cells can cause a rapid movement of organs in a predetermined direction. Even dead tissue can be actuated by a swelling or drying of the plant cell walls. The deformation of the organ is controlled at different levels of tissue hierarchy by geometrical constraints at the micrometre level (e.g. cell shape and size) and cell wall polymer composition at the nanoscale (e.g. cellulose fibril orientation). This paper reviews different mechanisms of organ movement in plants and highlights recent research in the field. Particular attention is paid to systems that are activated without any metabolism. The design principles of such systems may be particularly useful for a biomimetic translation into active technical composites and moving devices.

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Osmoregulation of leaf motor cells

Cited by 112 publications

References 83 publications

SEMI-ROLLED LEAF1 Encodes a Putative Glycosylphosphatidylinositol-Anchored Protein and Modulates Rice Leaf Rolling by Regulating the Formation of Bulliform Cells

SEMI-ROLLED LEAF1 Encodes a Putative Glycosylphosphatidylinositol-Anchored Protein and Modulates Rice Leaf Rolling by Regulating the Formation of Bulliform Cells

Roles of a putative mechanosensitive plasma membrane Ca²⁺-permeable channel OsMCA1 in generation of reactive oxygen species and hypo-osmotic signaling in rice

Actuation systems in plants as prototypes for bioinspired devices

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Osmoregulation of leaf motor cells

Cited by 112 publications

References 83 publications

SEMI-ROLLED LEAF1 Encodes a Putative Glycosylphosphatidylinositol-Anchored Protein and Modulates Rice Leaf Rolling by Regulating the Formation of Bulliform Cells

SEMI-ROLLED LEAF1 Encodes a Putative Glycosylphosphatidylinositol-Anchored Protein and Modulates Rice Leaf Rolling by Regulating the Formation of Bulliform Cells

Roles of a putative mechanosensitive plasma membrane Ca2+-permeable channel OsMCA1 in generation of reactive oxygen species and hypo-osmotic signaling in rice

Actuation systems in plants as prototypes for bioinspired devices

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Roles of a putative mechanosensitive plasma membrane Ca²⁺-permeable channel OsMCA1 in generation of reactive oxygen species and hypo-osmotic signaling in rice