Peroxidase Activity in the Leaf Elongation Zone of Tall Fescue

MacAdam, Jennifer W.; Nelson, C. J.; Sharp, Robert E.

doi:10.1104/pp.99.3.872

Cited by 312 publications

(90 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…by APRX-the growth rate rapidly decreases to a low basal rate. In leaves several studies have reported an association between increasing peroxidase activity and the timing or location of cessation of cell expansion (MacAdam et al 1992).…”

Section: Aprx Has a Role In Elongation Processesmentioning

confidence: 99%

An anionic class III peroxidase from zucchini may regulate hypocotyl elongation through its auxin oxidase activity

Cosio

Vuillemin

Meyer

et al. 2009

Planta

View full text Add to dashboard Cite

The high number of peroxidase genes explains the description of numerous physiological functions and the fact that the in planta function of a single isoform has never been characterized yet. We analyzed in transgenic Arabidopsis thaliana the localization of a zucchini isoperoxidase (APRX), previously puriWed thanks to its pectin binding ability. We conWrmed that the protein is localized near the cell wall, mainly produced in the elongation area of the hypocotyls and respond to exogenous auxin. In addition, the ectopic overexpression of APRX induced changes in growth pattern and a signiWcant reduction of endogenous indole-3-acetic acid (IAA) level. In agreement with these observations APRX showed an elevated in vitro auxin oxidase activity. We propose that APRX participates in the negative feedback regulation of auxin level and consequently terminates the hypocotyl elongation process.

show abstract

Section: Aprx Has a Role In Elongation Processesmentioning

confidence: 99%

An anionic class III peroxidase from zucchini may regulate hypocotyl elongation through its auxin oxidase activity

Cosio

Vuillemin

Meyer

et al. 2009

Planta

View full text Add to dashboard Cite

show abstract

“…Pritchard, unpublished). Thus peroxidase may cause wall tightening following osmotic stress, but so far no isoenzyme has been found which correlates with development as demonstrated in leaves (MacAdam, Sharp & Nelson, 1992).…”

Section: Wall Eross'linkagesmentioning

confidence: 99%

The control of cell expansion in roots

Pritchard¹

1994

New Phytologist

153

View full text Add to dashboard Cite

SUMMARY The expansion of roots is considered at the level of the single cell. The water relations of cell expansion are discussed. Water entry, solute import and cell wall properties are considered as possible regulatory points. It is argued that root cell expansion can be understood in terms of cell turgor pressure and the physical properties of the cell wall, provided solute supply is not limiting. Various measurements of cell wall properties in roots are presented and the assumptions underlying their measurements are presented. It is concluded that cell wall properties must be measured over short time periods to prevent alterations in wall properties during the experiment. The radial location of the load‐bearing layers is discussed and it is concluded that, unlike aerial tissue, growth is limited by the properties of the inner layer of the root cortex. Evidence is presented to show that cell wall properties can change both during development and following turgor perturbation. In general, however, turgor itself is tightly regulated, particularly towards the root tip. A number of environmental situations are presented in which root growth is altered. The mechanism of the alteration is discussed at the single cell level. These 'stresses’include osmotic stress, low temperature and soil compaction. In many cases the alteration of root growth is consistent with changes in the ceil wall properties of the growing ceils. Severe stress, resulting in near cessation of root cell extension, can result in a change (usually an increase) in turgor pressure. The change in turgor pressure of the cells in the growing zone is smaller than that which would be expected from a continuation of an unstressed solute import rate. This exemplifies both the change in cell wall properties and the tight turgor homeostasis of root tips. The biochemical processes which underlie the modulation of cell wall properties are presented as they are currently understood in roots. Measurements of the chemical composition of the wall have not revealed any useful differences which can explain the developmental or stress‐induced changes in cell wall properties. Recent work on cell wall enzymes and proteins may provide information about control of cross‐linkages within the wall. In the last section the relative importance of apoplastic and symplastic solute transport to the expanding cells is considered. At present the consensus appears to favour the symplastic route, but the apoplastic pathway may also operate, possibly as a scavenging mechanism for leaked ions. The regulation of turgor pressure by linking solute import with wall loosening is discussed.

show abstract

“…The POD activity was spectrophotometrically measured based on the oxidation of guaiacol in the presence of H 2 O 2 (MacAdam et al 1992). The reaction mixture contained 3.0 mL of pH 6, 50 mM potassium phosphate buffer, 40 µL of 30 mM H 2 O 2 and 50 µL of 0.2 M guaiacol.…”

Section: Pod Activitymentioning

confidence: 99%

Effects of heat stress on growth, photosynthetic pigments, oxidative damage and competitive capacity of three submerged macrophytes

Silva

Asaeda

2017

Journal of Plant Interactions

View full text Add to dashboard Cite

There is an information gap regarding heat stress-induced oxidative damage and the species-specific behavior of plants under stress conditions. The present study was designed with the hypothesis that heat stress may induce species-specific oxidative damage that determines the competitive capacity of common submerged macrophytes. We conducted two laboratory experiments to simulate mono-and mixed cultures of three submerged macrophytes with the application of two heat shock treatments. The results showed that both heat shocks had significant effects on growth, photosynthetic pigments and the ability to induce strong oxidative damage for all three species. The comparative results of mono-and mixed cultures showed that P. crispus had an advantage in both the control and hightemperature treatments over the other two species as a strong competitor in the mixed culture. Further, the competitive capacity of P. crispus increased in the moderately high-temperature condition compared to the control. ARTICLE HISTORY

show abstract

Peroxidase Activity in the Leaf Elongation Zone of Tall Fescue

Cited by 312 publications

References 35 publications

An anionic class III peroxidase from zucchini may regulate hypocotyl elongation through its auxin oxidase activity

An anionic class III peroxidase from zucchini may regulate hypocotyl elongation through its auxin oxidase activity

The control of cell expansion in roots

Effects of heat stress on growth, photosynthetic pigments, oxidative damage and competitive capacity of three submerged macrophytes

Contact Info

Product

Resources

About