Brassinolide may control aquaporin activities in Arabidopsis thaliana

Morillón, Raphaël; Catterou, Manuella; Sangwan, Rajbir S.; Sangwan, Brigitte; Lassalles, Jean-Paul

doi:10.1007/s004250000379

Cited by 72 publications

(45 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A recent study also suggested that BR could control aquaporin activities. Correlations were observed between the hypocotyl length and water permeability of protoplasts isolated from both non-treated or BR-treated dwarf mutants deficient in BR biosynthesis (Morillon et al, 2001).…”

Section: Discussionmentioning

confidence: 89%

“…Although the exact function of TTL awaits further investigation, its membrane association and its effects on BR-mediated growth responses suggest that this protein might interact with membrane proteins or activities previously implicated in BRstimulated cell elongation, such as cell wall biosynthesis/ reorganization of cortical microtubule (Mayumi and Shibaoka, 1995;Yamamuro et al, 2000;, the plasma membrane ATPases (Katsumi, 1991), and aquaporins (Morillon et al, 2001). Plant growth and morphogenesis are largely contributed by cell elongation/expansion, which depends on the de novo biosynthesis and modification of cell wall (activated mainly by gene expression), the deposit orientation of nascent cellulose microfibrils (determined by cortical microtubules), and the internal turgor pressure (generated by water uptake).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

The Arabidopsis Transthyretin-Like Protein Is a Potential Substrate of BRASSINOSTEROID-INSENSITIVE 1

Nam

2004

Plant Cell

View full text Add to dashboard Cite

BRASSINOSTEROID-INSENSITIVE 1 (BRI1) is a Leu-rich-repeat (LRR) receptor kinase that functions as a critical component of a transmembrane brassinosteroid (BR) receptor. It is believed that BRI1 becomes activated through heterodimerization with BAK1, a similar LRR receptor kinase, in response to BR signal. A yeast two-hybrid screen using the kinase domain of BRI1 identified an Arabidopsis thaliana Transthyretin-Like protein (TTL) as a potential BRI1 substrate. TTL interacts with BRI1 in a kinase-dependent manner in yeast and is phosphorylated by BRI1 in vitro. TTL displays a similar expression pattern with BRI1 and is associated with the plasma membrane. Overexpression of the TTL gene results in a phenotype that was observed in weak bri1 mutants and null bak1 mutants. By contrast, two T-DNA insertional mutations in the TTL gene promote plant growth and enhance BR sensitivity. We hypothesized that TTL might directly regulate certain biochemical activities near the plasma membrane to control plant growth.

show abstract

Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

The Arabidopsis Transthyretin-Like Protein Is a Potential Substrate of BRASSINOSTEROID-INSENSITIVE 1

Nam

2004

Plant Cell

View full text Add to dashboard Cite

show abstract

“…A link between growth and water channel activity has been indicated from a correlation between P os of hypocotyl protoplasts and hypocotyl growth induced by brassinolide in an Arabidopsis mutant defective in brassinolide synthesis (Morillon et al 2001a). Again over a 100-fold difference in P os between individual protoplasts was measured for wild-type, but brassinolide-treated mutant plants appeared to have a significant subpopulation of cells with higher P os than untreated controls.…”

Section: Plasma Membranesmentioning

confidence: 93%

Plant aquaporins: multifunctional water and solute channels with expanding roles

Tyerman¹,

Niemietz²,

Bramley³

2002

Plant Cell & Environment

553

360

View full text Add to dashboard Cite

There is strong evidence that aquaporins are central components in plant water relations. Plant species possess more aquaporin genes than species from other kingdoms. According to sequence similarities, four major groups have been identified, which can be further divided into subgroups that may correspond to localization and transport selectivity. They may be involved in compatible solute distribution, gas-transfer (CO 2 , NH 3 ) as well as in micronutrient uptake (boric acid). Recent advances in determining the structure of some aquaporins gives further details on the mechanism of selectivity. Gating behaviour of aquaporins is poorly understood but evidence is mounting that phosphorylation, pH, pCa and osmotic gradients can affect water channel activity. Aquaporins are enriched in zones of fast cell division and expansion, or in areas where water flow or solute flux density would be expected to be high. This includes biotrophic interfaces between plants and parasites, between plants and symbiotic bacteria or fungi, and between germinating pollen and stigma. On a cellular level aquaporin clusters have been identified in some membranes. There is also a possibility that aquaporins in the endoplasmic reticulum may function in symplasmic transport if water can flow from cell to cell via the desmotubules in plasmodesmata. Functional characterization of aquaporins in the native membrane has raised doubt about the conclusiveness of expression patterns alone and need to be conducted in parallel. The challenge will be to elucidate gating on a molecular level and cellular level and to tie those findings into plant water relations on a macroscopic scale where various flow pathways need to be considered.

show abstract

“…Brassinolide may control aquaporin activities in Arabidopsis thaliana, which has been shown to be involved in the modification of the water-transport properties of cell membranes [105], however, mRNA and protein levels of aquaporin isoforms in root and shoot of radish were not affected by brassinolide treatment [104]. Ethylene significantly increased stomatal conductance, root hydraulic conductivity (L p ), and root oxygen uptake in hypoxic seedlings.…”

Section: Relationships Between Plant Aquaporins and Hormonesmentioning

confidence: 99%

Aquaporin structure–function relationships: Water flow through plant living cells

Zhao

Shao

Chu

2008

Colloids and Surfaces B: Biointerfaces

View full text Add to dashboard Cite

Plant aquaporins play an important role in water uptake and movement-an aquaporin that opens and closes a gate that regulates water movement in and out of cells. Some plant aquaporins also play an important role in response to water stress. Since their discovery, advancing knowledge of their structures and properties led to an understanding of the basic features of the water transport mechanism and increased illumination to water relations. Meanwhile, molecular and functional characterization of aquaporins has revealed the significance of their regulation in response to the adverse environments such as salinity and drought. This paper reviews the structure, species diversity, physiology function, regulation of plant aquaporins, and the relations between environmental factors and plant aquaporins. Complete understanding of aquaporin function and regulation is to integrate those mechanisms in time and space and to well regulate the permeation of water across biological membranes under changing environmental and developmental conditions.

show abstract

Brassinolide may control aquaporin activities in Arabidopsis thaliana

Cited by 72 publications

References 38 publications

The Arabidopsis Transthyretin-Like Protein Is a Potential Substrate of BRASSINOSTEROID-INSENSITIVE 1

The Arabidopsis Transthyretin-Like Protein Is a Potential Substrate of BRASSINOSTEROID-INSENSITIVE 1

Plant aquaporins: multifunctional water and solute channels with expanding roles

Aquaporin structure–function relationships: Water flow through plant living cells

Contact Info

Product

Resources

About