Evidence against the acid-growth theory of auxin action

Planta ◽  
1985 ◽  
Vol 163 (4) ◽  
pp. 483-493 ◽  
Author(s):  
U. Kutschera ◽  
P. Schopfer
Keyword(s):  
Growth Theory ◽  
Acid Growth ◽  
Auxin Action ◽  
Acid Growth Theory

scholarly journals Reexamination of the Acid Growth Theory of Auxin Action

1990 ◽  
Vol 93 (3) ◽  
pp. 931-939 ◽  
Author(s):  
Hartwig Lüthen ◽  
Michael Bigdon ◽  
Michael Böttger
Keyword(s):  
Growth Theory ◽  
Acid Growth ◽  
Auxin Action ◽  
Acid Growth Theory

scholarly journals Some New Methodological and Conceptual Aspects of the “Acid Growth Theory” for the Auxin Action in Maize (Zea mays L.) Coleoptile Segments: Do Acid- and Auxin-Induced Rapid Growth Differ in Their Mechanisms?

2021 ◽  
Vol 22 (5) ◽  
pp. 2317
Author(s):  
Małgorzata Polak ◽  
Waldemar Karcz
Keyword(s):  
Zea Mays L ◽  
Growth Theory ◽  
Proton Extrusion ◽  
Response Curves ◽  
Acid Growth ◽  
Rapid Phase ◽  
Auxin Action ◽  
Proton Diffusion ◽  
Acid Growth Theory ◽  
Kinetics Of

Two arguments against the “acid growth theory” of auxin-induced growth were re-examined. First, the lack of a correlation between the IAA-induced growth and medium acidification, which is mainly due to the cuticle, which is a barrier for proton diffusion. Second, acid- and the IAA-induced growth are additive processes, which means that acid and the IAA act via different mechanisms. Here, growth, medium pH, and membrane potential (in some experiments) were simultaneously measured using non-abraded and non-peeled segments but with the incubation medium having access to their lumen. Using such an approach significantly enhances both the IAA-induced growth and proton extrusion (similar to that of abraded segments). Staining the cuticle on the outer and inner epidermis of the coleoptile segments showed that the cuticle architecture differs on both sides of the segments. The dose-response curves for the IAA-induced growth and proton extrusion were bell-shaped with the maximum at 10−4 M over 10 h. The kinetics of the IAA-induced hyperpolarisation was similar to that of the rapid phase of the IAA-induced growth. It is also proposed that the K+/H+ co-transporters are involved in acid-induced growth and that the combined effect of the K+ channels and K+/ H+ co-transporters is responsible for the IAA-induced growth. These findings support the “acid growth theory” of auxin action.

scholarly journals TIR1/AFB-Aux/IAA auxin perception mediates rapid cell wall acidification and growth of Arabidopsis hypocotyls

eLife ◽  
2016 ◽  
Vol 5 ◽  
Author(s):  
Matyáš Fendrych ◽  
Jeffrey Leung ◽  
Jiří Friml
Keyword(s):  
Cell Wall ◽  
Gene Transcription ◽  
Growth Theory ◽  
Auxin Signaling ◽  
Differential Growth ◽  
Acid Growth ◽  
Genetic Manipulations ◽  
Gravity Response ◽  
Acid Growth Theory ◽  
Cell Wall Acidification

Despite being composed of immobile cells, plants reorient along directional stimuli. The hormone auxin is redistributed in stimulated organs leading to differential growth and bending. Auxin application triggers rapid cell wall acidification and elongation of aerial organs of plants, but the molecular players mediating these effects are still controversial. Here we use genetically-encoded pH and auxin signaling sensors, pharmacological and genetic manipulations available for Arabidopsis etiolated hypocotyls to clarify how auxin is perceived and the downstream growth executed. We show that auxin-induced acidification occurs by local activation of H+-ATPases, which in the context of gravity response is restricted to the lower organ side. This auxin-stimulated acidification and growth require TIR1/AFB-Aux/IAA nuclear auxin perception. In addition, auxin-induced gene transcription and specifically SAUR proteins are crucial downstream mediators of this growth. Our study provides strong experimental support for the acid growth theory and clarified the contribution of the upstream auxin perception mechanisms.

Evidence for the acid-growth theory of fusicoccin action

Planta ◽  
1985 ◽  
Vol 163 (4) ◽  
pp. 494-499 ◽  
Author(s):  
U. Kutschera ◽  
P. Schopfer
Keyword(s):  
Growth Theory ◽  
Acid Growth ◽  
Acid Growth Theory ◽  
Fusicoccin Action

scholarly journals Low Proton Conductance of Plant Cuticles and Its Relevance to the Acid-Growth Theory

1981 ◽  
Vol 68 (3) ◽  
pp. 664-667 ◽  
Author(s):  
S. Ann Dreyer ◽  
Virginia Seymour ◽  
Robert E. Cleland
Keyword(s):  
Growth Theory ◽  
Proton Conductance ◽  
Acid Growth ◽  
Plant Cuticles ◽  
Acid Growth Theory

scholarly journals Rapid Auxin-Mediated Cell Expansion

2020 ◽  
Vol 71 (1) ◽  
pp. 379-402 ◽  
Author(s):  
Minmin Du ◽  
Edgar P. Spalding ◽  
William M. Gray
Keyword(s):  
Plasma Membrane ◽  
Cell Expansion ◽  
Plant Hormone ◽  
Molecular Level ◽  
Good News ◽  
Growth Theory ◽  
Acid Growth ◽  
Promotive Effect ◽  
Acid Growth Theory ◽  
Regulate Protein

The promotive effect of auxin on shoot cell expansion provided the bioassay used to isolate this central plant hormone nearly a century ago. While the mechanisms underlying auxin perception and signaling to regulate transcription have largely been elucidated, how auxin controls cell expansion is only now attaining molecular-level definition. The good news is that the decades-old acid growth theory invoking plasma membrane H+-ATPase activation is still useful. The better news is that a mechanistic framework has emerged, wherein Small Auxin Up RNA (SAUR) proteins regulate protein phosphatases to control H+-ATPase activity. In this review, we focus on rapid auxin effects, their relationship to H+-ATPase activation and other transporters, and dependence on TIR1/AFB signaling. We also discuss how some observations, such as near-instantaneous effects on ion transport and root growth, do not fit into a single, comprehensive explanation of how auxin controls cell expansion, and where more research is warranted.

The pH profile for acid-induced elongation of coleoptile and epicotyl sections is consistent with the acid-growth theory

Planta ◽  
1991 ◽  
Vol 186 (1) ◽  
Author(s):  
RobertE. Cleland ◽  
Graham Buckley ◽  
Sogol Nowbar ◽  
NinaM. Lew ◽  
Charles Stinemetz ◽  
...  
Keyword(s):  
Growth Theory ◽  
Acid Growth ◽  
Ph Profile ◽  
Acid Growth Theory

The in-vitro acid-growth response: Relation to in-vivo growth responses and auxin action

Planta ◽  
1972 ◽  
Vol 104 (4) ◽  
pp. 282-296 ◽  
Author(s):  
David L. Rayle ◽  
Robert Cleland
Keyword(s):  
Growth Response ◽  
Growth Responses ◽  
Acid Growth ◽  
Auxin Action ◽  
In Vivo Growth
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