Directionality of Plasmodesmata-Mediated Transport in Arabidopsis Leaves Supports Auxin Channeling

Gao, Chen; Liu, Xiangdong; Storme, Nico De; Jensen, Kaare H.; Xu, Qiyu; Yang, Jintao; Liu, Xiaohui; Chen, Shaolin; Martens, Helle Juel; Schulz, Alexander; Liesche, Johannes

doi:10.1016/j.cub.2020.03.014

Cited by 43 publications

(65 citation statements)

References 27 publications

(39 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

Section: Photoreceptor Control Of Auxin Transportmentioning

confidence: 99%

“…Besides PIN-mediated auxin transport, regulated diffusion through plasmodesmata may stimulate rapid directional auxin transport from leaf tip to petiole base [91]. The direction of the auxin flow depends on higher permeability for auxin in the longitudinal versus transverse direction of the cells along the petiole and midrib of the lamina [91]. Impaired glucan-mediated control of plasmodesmata aperture in the Glucan Synthase Like 8 (GSL8) mutant gsl8 reduced the leaf hyponasty response to auxin application to the leaf tip [91].…”

Section: Photoreceptor Control Of Auxin Transportmentioning

confidence: 99%

“…The direction of the auxin flow depends on higher permeability for auxin in the longitudinal versus transverse direction of the cells along the petiole and midrib of the lamina [91]. Impaired glucan-mediated control of plasmodesmata aperture in the Glucan Synthase Like 8 (GSL8) mutant gsl8 reduced the leaf hyponasty response to auxin application to the leaf tip [91]. It remains to be investigated if plasmodesmata aperture is regulated by photoreceptor signalling and light or temperature treatments.…”

Section: Photoreceptor Control Of Auxin Transportmentioning

confidence: 99%

See 2 more Smart Citations

Photoreceptors Regulate Plant Developmental Plasticity through Auxin

Küpers

Oskam

Pierik

2020

Plants

View full text Add to dashboard Cite

Light absorption by plants changes the composition of light inside vegetation. Blue (B) and red (R) light are used for photosynthesis whereas far-red (FR) and green light are reflected. A combination of UV-B, blue and R:FR-responsive photoreceptors collectively measures the light and temperature environment and adjusts plant development accordingly. This developmental plasticity to photoreceptor signals is largely regulated through the phytohormone auxin. The phytochrome, cryptochrome and UV Resistance Locus 8 (UVR8) photoreceptors are inactivated in shade and/or elevated temperature, which releases their repression of Phytochrome Interacting Factor (PIF) transcription factors. Active PIFs stimulate auxin synthesis and reinforce auxin signalling responses through direct interaction with Auxin Response Factors (ARFs). It was recently discovered that shade-induced hypocotyl elongation and petiole hyponasty depend on long-distance auxin transport towards target cells from the cotyledon and leaf tip, respectively. Other responses, such as phototropic bending, are regulated by auxin transport and signalling across only a few cell layers. In addition, photoreceptors can directly interact with components in the auxin signalling pathway, such as Auxin/Indole Acetic Acids (AUX/IAAs) and ARFs. Here we will discuss the complex interactions between photoreceptor and auxin signalling, addressing both mechanisms and consequences of these highly interconnected pathways.

show abstract

Section: Photoreceptor Control Of Auxin Transportmentioning

confidence: 99%

Section: Photoreceptor Control Of Auxin Transportmentioning

confidence: 99%

Section: Photoreceptor Control Of Auxin Transportmentioning

confidence: 99%

See 1 more Smart Citation

Photoreceptors Regulate Plant Developmental Plasticity through Auxin

Küpers

Oskam

Pierik

2020

Plants

View full text Add to dashboard Cite

show abstract

“…An example of this, in the context of auxin, was recently provided in Gao et al (2020). The authors quantified cell-cell coupling in leaf tissues using a photoactivatable dye (Martens et al, 2004).…”

Section: Diffusion With Channelling Effectsmentioning

confidence: 99%

“…Using a radiolabeled version of auxin, applied to the leaf tip, more auxin arrived (sooner) in the petiole of wild-type plants compared to that of the mutant. Channelling might aid movement, possibly by reducing dissipation (Gao et al, 2020).…”

Section: Diffusion With Channelling Effectsmentioning

confidence: 99%

Uncharted routes: exploring the relevance of auxin movement via plasmodesmata

Paterlini

2020

Biology Open

View full text Add to dashboard Cite

Auxin is an endogenous small molecule with an incredibly large impact on growth and development in plants. Movement of auxin between cells, due to its negative charge at most physiological pHs, strongly relies on families of active transporters. These proteins import auxin from the extracellular space or export it into the same. Mutations in these components have profound impacts on biological processes. Another transport route available to auxin, once the substance is inside the cell, are plasmodesmata connections. These small channels connect the cytoplasms of neighbouring plant cells and enable flow between them. Interestingly, the biological significance of this latter mode of transport is only recently starting to emerge with examples from roots, hypocotyls and leaves. The existence of two transport systems provides opportunities for reciprocal cross-regulation. Indeed, auxin levels influence proteins controlling plasmodesmata permeability, while cell–cell communication affects auxin biosynthesis and transport. In an evolutionary context, transporter driven cell–cell auxin movement and plasmodesmata seem to have evolved around the same time in the green lineage. This highlights a co-existence from early on and a likely functional specificity of the systems. Exploring more situations where auxin movement via plasmodesmata has relevance for plant growth and development, and clarifying the regulation of such transport, will be key aspects in coming years.This article has an associated Future Leader to Watch interview with the author of the paper.

show abstract