Mechanisms of auxin‐induced plant cell elongation

Brummer, Benno; Parish, Roger W.

doi:10.1016/0014-5793(83)80720-0

Cited by 47 publications

(14 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, a number of studies have shown that plant hormones in general, and auxins in particular, can significantly affect the uptake and further transport of nutrients within plants by regulating the sink action of developing tissues (Arteca, 1996;San-Francisco et al, 2005). Brummer and Parish (1983) hypothesized that an ionic gradient of the differential transmembrane, due to auxininduced transport processes, resulted in changes in permeability of various ions. Those previous studies supported our results (Tables 2 and 3).…”

Section: Discussionmentioning

confidence: 99%

Effect of indole-3-acetic acid on lead accumulation in maize (Zea mays L.) seedlings and the relevant antioxidant response

Wang

Shan

Wen

et al. 2007

Environmental and Experimental Botany

107

View full text Add to dashboard Cite

The effect of indole-3-acetic acid (IAA) on lead (Pb) accumulation in maize (Zea mays L. cv. TY2) seedlings, and the responses of maize to Pb, IAA or Pb + IAA stress were investigated under hydroponic conditions. Exogenous IAA significantly increased Pb accumulation in roots, but significantly decreased Pb accumulation in shoots over the culture period of 5 days. Increased Pb uptake in maize roots partly took place through calcium and potassium channels, and also depended upon membrane potential. Lipid peroxidation in terms of malondialdehyde (MDA) content was enhanced, indicating that Pb and/or IAA caused oxidative stress in maize seedlings. Under stress conditions the antioxidant defense mechanism was activated. Some antioxidant enzymes such as superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) were up-regulated compared to the control. Pb, IAA or Pb + IAA treatments resulted in a general reduction of macro-and micronutrient contents, especially of K, Ca and Mn. Compared to a single Pb or IAA treatment, treatment with a combination of Pb + IAA induced more severe oxidative stress on maize roots and shoots as inferred from the higher observed MDA and lower nutrient contents. A Fourier transform infrared (FTIR) spectroscopic study indicated that Pb reacted with the carboxylic acid group of the IAA pyrrole cycle.

show abstract

Section: Discussionmentioning

confidence: 99%

Effect of indole-3-acetic acid on lead accumulation in maize (Zea mays L.) seedlings and the relevant antioxidant response

Wang

Shan

Wen

et al. 2007

Environmental and Experimental Botany

107

View full text Add to dashboard Cite

show abstract

“…We have suggested that a central effect of auxins is cytosolic acidification which then leads to stimulation of the proton pump [12]. Unionized weak bases, such as procaine and NH3, penetrate the plasma membrane and reionize in the cytosol by gaining protons.…”

Section: Discussionmentioning

confidence: 99%

Evidence that acid solutions induce plant cell elongation by acidifying the cytosol and stimulating the proton pump

1984

Self Cite

View full text Add to dashboard Cite

Acetic acid (3 mM, pH 4.5) stimulated elongation growth of maize coleoptiles at a much higher rate than citric acid at the same pH and concentration. The effect of these solutions on cytosolic pH and membrane potential of maize rhizodermis cells was measured with microelectrodes. Citric acid caused a decrease in cytosolic pH and a slow membrane hyperpolarization. Acetic acid induced a larger and more rapid cytosolic acidification and membrane hyperpolarization. Hence, the degree of growth stimulation by the acids was positively correlated with the extent of their cytosolic acidification and stimulation of the proton pump. We suggest the acids induce growth by acidifying the cytosol and stimulating the proton pump rather than via direct acidification of the cell wall.

show abstract

“…The second approach was to map the current density and pattern in media of different pH values (3,(5)(6)(7). This was carried out rapidly in order to establish how sudden increases or decreases in H+ concentration affected the current density.…”

Section: Ion-substitution Experimentsmentioning

confidence: 99%

“…There is little doubt that a low pH environment in the vicinity of cell walls can, over the short term, stimulate strongly elongation in root segments (9). It is still not clear whether this has any significance to the long term growth of intact roots in response to auxin or low pH (5,13).…”

Section: Hypothesismentioning

confidence: 99%

Correlation between Root-Generated Ionic Currents, pH, Fusicoccin, Indoleacetic Acid, and Growth of the Primary Root of Zea mays

Miller¹,

Gow²

1989

Plant Physiol.

View full text Add to dashboard Cite

Correlations between root-generated ionic currents, extracellular pH, indoleacetic acid, fusicoccin, and growth were investigated. Current consistently entered the meristematic and elongating tissues of intact growing roots of Zea mays cv Golden Bantam. Mature root regions generated the outward limb of the current loop. Ion-substitution and pH-profile experiments suggested that the bulk of the ionic current was carried by H. Calcium ions did not carry current, but calcium may regulate the proton circulation since the proton current density was slightly larger in calcium-depleted media. Increased root elongation at low pH was associated with increased current density and an extended zone of inward current. Conversely decreased elongation at high pH was associated with a reduced current density and a more restricted zone of inward current. The effect of the fungal toxin fusicoccin was to increase the current density of the inward limb of the ion current and to increase root extension. Concentrations of indoleacetic acid that reduced root growth, also reduced the density of the inward current and shortened the inward current zone. The results emphasize the point that roots are electrically contiguous over many millimeters and that the electrophysiology of root growth is best studied in intact root systems.

show abstract

Mechanisms of auxin‐induced plant cell elongation

Cited by 47 publications

References 49 publications

Effect of indole-3-acetic acid on lead accumulation in maize (Zea mays L.) seedlings and the relevant antioxidant response

Effect of indole-3-acetic acid on lead accumulation in maize (Zea mays L.) seedlings and the relevant antioxidant response

Evidence that acid solutions induce plant cell elongation by acidifying the cytosol and stimulating the proton pump

Correlation between Root-Generated Ionic Currents, pH, Fusicoccin, Indoleacetic Acid, and Growth of the Primary Root of Zea mays

Contact Info

Product

Resources

About