Accumulation rate of ABA in detached maize roots correlates with root water potential regardless of age and branching order

Simonneau, Thierry; Barrieu, Philippe; Tardieu, Francois F.

doi:10.1046/j.1365-3040.1998.00344.x

Cited by 44 publications

(26 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…ABA modifies root hydraulic properties caused by imbalances between root water uptake and leaf transpiration (Aroca et al, 2012). The main role of ABA seems to be to regulate the plant's water balance, including under drought (Simonneau et al, 1998;Nan et al, 2002), and flooding stress (Olivella et al, 2000;Nan et al, 2002). For example, in Triticum aestivum L. plants, while ABA levels increased in roots and leaves in response to water deficit; ABA briefly increased in roots and leaves but then decreased in response to waterlogging (Nan et al, 2002).…”

Section: Waterlogging Causes Anatomical Physiological and Molecularmentioning

confidence: 99%

Plant water stress: Associations between ethylene and abscisic acid response

Salazar

Hernández²,

Pino³

2015

Chilean J. Agric. Res.

View full text Add to dashboard Cite

Agriculture is severely impacted by water stress due either to excess (hypoxia/anoxia) or deficit of water availability. Hypoxia/anoxia is associated with oxygen (O 2 ) deficiency or depletion, inducing several anatomical, morphological, physiological, and molecular changes. The majority of these alterations are adaptive mechanisms to cope with low O 2 availability; among them, alterations in shoot length, aerenchyma formation and adventitious roots have been described in several studies. The aim of this review was to address the association between abscisic acid (ABA) and ethylene in function of water availability in plants. The major physiological responses to low O 2 are associated with changes in root respiration, stomatal conductance, photosynthesis, and fermentation pathways in roots. In addition, several changes in gene expression have been associated with pathways that are not present under normal O 2 supply. The expression of ethylene receptor genes is up-regulated by low O 2 , and ethylene seems to have a crucial role in anatomical and physiological effects during hypoxia/anoxia. During O 2 depletion, ethylene accumulation down-regulates ABA by inhibiting rate-limiting enzymes in ABA biosynthesis and by activating ABA breakdown to phaseic acid. With regard to water deficit, drought is primarily sensed by the roots, inducing a signal cascade to the shoots via xylem causing physiological and morphological changes. Several genes are regulated up or down with osmotic stress; the majority of these responsive genes can be driven by either an ABA-dependent or ABA-independent pathway. Some studies suggest that ethylene shuts down leaf growth very fast after the plant senses limited water availability. Ethylene accumulation can antagonize the control of gas exchange and leaf growth upon drought and ABA accumulation.

show abstract

Section: Waterlogging Causes Anatomical Physiological and Molecularmentioning

confidence: 99%

Plant water stress: Associations between ethylene and abscisic acid response

Salazar

Hernández²,

Pino³

2015

Chilean J. Agric. Res.

View full text Add to dashboard Cite

show abstract

“…Supply of radioactive [8-14 C] adenine, a precursor of cytokinins, to isolated pea (Pisum sativum) roots and quantification of radioactive cytokinins in root extracts established that roots can synthesise cytokinins (Chen et al, 1985). Dehydration of detached roots of several species (Milborrow and Robinson, 1973) and of various ages and branching orders (Simonneau et al, 1998) stimulated ABA synthesis. Root expression of hormone-biosynthesis genes provides further circumstantial evidence of root hormone biosynthesis, but sites of high gene expression may not necessarily be sites of high hormone synthesis.…”

Section: Features Of Root-to-shoot Signalsmentioning

confidence: 99%

Root-To-Shoot Signalling: Assessing The Roles of ‘Up’ In the Up and Down World of Long-Distance Signalling In Planta

Dodd

2005

Plant Soil

225

View full text Add to dashboard Cite

An important mediator of shoot physiological processes can be the supply of signal molecules (other than water and nutrients) from the root system. Root-to-shoot signalling is often considered to be important in regulating shoot growth and water use when soil conditions change without any demonstrable change in shoot water or nutrient status. Changes in xylem sap composition are often thought to be synonymous with changes in root-to-shoot signalling, even though there is considerable re-cycling of compounds between xylem and phloem. Techniques used to collect xylem sap are reviewed. Elucidating the roles of putative root signal molecules in planta has usually taken priority over identifying the sources of signal molecules in xylem sap. The roles of several signal molecules are considered. This choice is selective, and the failure of known signals to account for observed physiological changes in some systems has lead to the conclusions that other novel signals can be important. The efficacy of a given signal molecule can depend on the shoot water and nutrient status, as demonstrated by variation in stomatal responses to abscisic acid. If such variation is widespread in crop species, this may have implications for the increasing intentional use of rootto-shoot signals to modify crop water use and shoot architecture. Research into root-to-shoot signalling may become increasingly reductionist, in trying to evaluate the contribution of root signals versus local processes to observed physiological changes. However, future challenges are to successfully integrate this basic research into improved crop production systems.

show abstract

“…Subsequent root ABA accumulation in WT rootstocks was attenuated by a flc scion, while a WT scion increased the ABA concentration in flc rootstocks, indicating that root ABA concentrations depend on shoot to root ABA transport. These changes in root ABA concentration are not explained by differences in root water relations (Manzi et al ), although root ABA concentrations correlate with the water status of both detached roots (Cornish and Zeevaart ; Simonneau et al ) and the roots of ungrafted plants (Zhang and Davies ; Puértolas et al ). Resolving the relative importance of local versus systemic effects on root ABA concentration in grafted plants is important, especially since ABA increases root hydraulic conductance which can alter plant water relations (Thompson et al ).…”

Section: Introductionmentioning

confidence: 99%

Long-distance ABA transport can mediate distal tissue responses by affecting local ABA concentrations

Ollas

Dodd

2018

J. Integr. Plant Biol.

View full text Add to dashboard Cite

Environmental stresses that perturb plant water relations influence abscisic acid (ABA) concentrations, but it is unclear whether long-distance ABA transport contributes to changes in local ABA levels. To determine the physiological relevance of ABA transport, we made reciprocal-and self-grafts of ABA-deficient flacca mutant and wild-type (WT) tomato plants, in which low phosphorus (P) conditions decreased ABA concentrations while salinity increased ABA concentrations. Whereas foliar ABA concentrations in the WT scions were rootstock independent under control conditions, salinity resulted in longdistance transport of ABA: flacca scions had approximately twice as much ABA when grafted on WT rootstocks compared to flacca rootstocks. Root ABA concentrations were scion dependent: both WT and flacca rootstocks had less ABA with the flacca mutant scion than with the WT scion under control conditions. In WT scions, whereas rootstock genotype had limited effects on stomatal conductance under control conditions, a flacca rootstock decreased leaf area of stressed plants, presumably due to attenuated root-to-shoot ABA transport. In flacca scions, a WT rootstock decreased stomatal conductance but increased leaf area of stressed plants, likely due to enhanced root-to-shoot ABA transport. Thus, long-distance ABA transport can affect responses in distal tissues by changing local ABA concentrations.

show abstract

Accumulation rate of ABA in detached maize roots correlates with root water potential regardless of age and branching order

Cited by 44 publications

References 42 publications

Plant water stress: Associations between ethylene and abscisic acid response

Plant water stress: Associations between ethylene and abscisic acid response

Root-To-Shoot Signalling: Assessing The Roles of ‘Up’ In the Up and Down World of Long-Distance Signalling In Planta

Long-distance ABA transport can mediate distal tissue responses by affecting local ABA concentrations

Contact Info

Product

Resources

About