Cytosolic pH regulates root water transport during anoxic stress through gating of aquaporins

Tournaire-Roux, Colette; Sutka, Moira; Javot, Hélène; Gout, Elisabeth; Gerbeau, Patricia; Luu, Doan‐Trung; Bligny, Richard; Maurel, Christophe

doi:10.1038/nature01853

Cited by 604 publications

(633 citation statements)

References 24 publications

Supporting

Mentioning

588

Contrasting

Unclassified

Order By: Relevance

“…AtNIP5;1 conducts boron and urea when expressed in Xenopus oocytes [18], but AtNIP5;1 caused neither boron sensitivity nor urea uptake in yeast (data not shown). Thus, a direct comparison of the selectivity of individual plant aquaporin homologs with distinct ar/ R regions will be biased by their expression level, the differential trafficking to the correct membrane and the possible regulation of their open probability [19].…”

Section: Discussionmentioning

confidence: 99%

Molecular determinants of ammonia and urea conductance in plant aquaporin homologs

et al. 2008

View full text Add to dashboard Cite

Aquaporins and/or aquaglyceroporins regulate the permeability of plant membranes to water and small, uncharged molecules. Using molecular simulations with a plant plasma membrane aquaporin tetramer, the residues in the channel constriction region were identified as the crucial determinants of ammonia and urea conductance. The impact of these residues was experimentally verified using AtPIP2;1 pore mutants. Several, but not all, mutants with a NIP-like selectivity filter promoted yeast growth on urea or ammonia as sole sources of nitrogen. TIP-like mutants conducted urea but not NH 3 , and a residue without direct contact to the pore lumen was critical for conduction in the mutants.

show abstract

Section: Discussionmentioning

confidence: 99%

Molecular determinants of ammonia and urea conductance in plant aquaporin homologs

et al. 2008

View full text Add to dashboard Cite

show abstract

“…Os segundos mensageiros candidatos a agirem durante o alagamento seriam os níveis de ATP, o declínio no pH citossólico (provavelmente causado pelo acúmulo de lactato) e as aquaporinas (Tournaire-Roux et al 2003). Esses autores propõem que um período de anóxia faz com que haja acidose (diminuição do pH) citossólica, evento que sinaliza a expressão que inibe a produção das aquaporinas, um dos subgrupos dentro da classe das Intrinsic Membrane Proteins -IMPs responsável pelo transporte de água através de membranas.…”

Section: Sinalização Metabólica E Hormonal Durante O Alagamentounclassified

Respostas fisiológicas de plantas amazônicas de regiões alagadas às mudanças climáticas globais

Grandis¹,

Godoi²,

Buckeridge³

2010

Rev. bras. Bot.

View full text Add to dashboard Cite

-(Physiological responses of Amazonian flooded plants to the global climate change). According to the last report of IPCC (Intergovernmental Panel of Climatic Change, 2007) an increase in atmospheric CO 2 concentration to ca. 0.072% is predicted to occur until the middle of this century. As a result, a tandem elevation of temperature of ca. +3 °C and a decrease in precipitation are to be expected. It has also been suggested that this scenario may lead to a gradual substitution of the tropical forest for savanna-like vegetation in Eastern parts of the Amazon. Within this perspective, a worth question is how the tree species that make up the Amazonian floodplains will respond to the global climatic change? Although predictions have been quite pessimistic, flooding of part of the Amazon will continue to occur for several years and it is important to understand its synergistic effects within the scenario of climate change. In this work, features related to plant metabolism and hormonal signaling during flooding is revised, and the possible effects that the climatic changes might have on plants from the Amazon are discussed. The information available in the literature suggests that under flooding, plants tend to mobilize storage compounds to supply carbon demand needed for maintenance metabolism under the effect of stress caused by the lack of oxygen. In contrast, under elevated CO 2 concentration, plants tend to increase photosynthesis and biomass. With an increase of about 3 °C these parameters may increase even more. Alternatively, with flooding, there is a general decrease in growth potential and it is possible that while favorable conditions of elevated CO 2 and temperature prevail, the positive effects may be counterbalanced by the negative effects of flooding. Thus, the physiological responses might be imperceptible or promote further growth up to the middle of the 21 st Century for most species that occur in the floodplains. However, if temperature and CO 2 levels surpass the threshold of optimal conditions for most plants, a decrease in physiological activity is to be expected.

show abstract

“…Among the processes of pH regulation, Smith and Raven (1979) emphasize excretion of excess protons or hydroxyl ions to the root medium. As with Eh, pH-dependent signals regulate physiological processes as, for instance, root water transport during anoxic stress (Tournaire-Roux et al 2003).…”

Section: Redox Homeostasismentioning

confidence: 99%

Redox potential (Eh) and pH as drivers of soil/plant/microorganism systems: a transdisciplinary overview pointing to integrative opportunities for agronomy

2012

View full text Add to dashboard Cite

Background Oxidation-reduction and acid-base reactions are essential for the maintenance of all living organisms. However, redox potential (Eh) has received little attention in agronomy, unlike pH, which is regarded as a master variable. Agronomists are probably depriving themselves of a key factor in crop and soil science which could be a useful integrative tool. Scope This paper reviews the existing literature on Eh in various disciplines connected to agronomy, whether associated or not with pH, and then integrates this knowledge within a composite framework. Conclusions This transdisciplinary review offers evidence that Eh and pH are respectively and jointly major drivers of soil/plant/microorganism systems. Information on the roles of Eh and pH in plant and microorganism physiology and in soil genesis converges to form an operational framework for further studies of soil/plant/microorganism functioning. This framework is based on the hypothesis that plants physiologically function within a specific internal Eh-pH range and that, along with microorganisms, they alter Eh and pH in the rhizosphere to ensure homeostasis at the cell level. This new perspective could help in bridging several disciplines related to agronomy, and across micro and macro-scales. It should help to improve cropping systems design and management, in conventional, organic, and conservation agriculture.

show abstract

Cytosolic pH regulates root water transport during anoxic stress through gating of aquaporins

Cited by 604 publications

References 24 publications

Molecular determinants of ammonia and urea conductance in plant aquaporin homologs

Molecular determinants of ammonia and urea conductance in plant aquaporin homologs

Respostas fisiológicas de plantas amazônicas de regiões alagadas às mudanças climáticas globais

Redox potential (Eh) and pH as drivers of soil/plant/microorganism systems: a transdisciplinary overview pointing to integrative opportunities for agronomy

Contact Info

Product

Resources

About