Actin Network as a Normal Component of the Cytoskeleton in Many Vascular Plant Cells

Parthasarathy, M. V.; Perdue, Tony D.; Witztum, A.; Alvernaz, Jennie

doi:10.2307/2443413

Cited by 75 publications

(30 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Epidermal, cortical, and vascular cells in the elongation zone were characterized by thick, predominantly longitudinally oriented MFs. This organization was similar to the organization of MFs in elongating cells of several vascular plants (Parthasarathy et al, 1985) and vascular tissues of gymnosperm (Pesacreta et al, 1982) and maize roots (Vaughan and Vaughn, 1987). Other studies, however, have reported the occurrence of fine, more or less parallel cortical MFs in elongating tobacco protoplasts (Hasezawa et al, 1989), in carrot (Traas et al, 1987) and alfalfa suspension cells (Seagull et al, 1987), as well as in elongating cells of pea roots (Hush and Overall, 1992).…”

Section: Discussionsupporting

confidence: 67%

“…These vesicles have been proposed to move along MFs that are aligned parallel to the pollen tube or root hair (Sievers and Schnepf, 1981). In elongating cells of vascular plants, MFs are arranged as thick longitudinal cables connected to a finer array of peripheral MFs that are either oriented longitudinally (Parthasarathy et al, 1985) or transversely (Seagull et al, 1987;Traas et al, 1987;Hasezawa et al, 1989). The actin cytoskeleton may have important implications for cell elongation.…”

Section: -5834mentioning

confidence: 99%

See 1 more Smart Citation

The Organization of the Actin Cytoskeleton in Vertical and Graviresponding Primary Roots of Maize

Blancaflor

Hasenstein

1997

Plant Physiology

View full text Add to dashboard Cite

Section: Discussionsupporting

confidence: 67%

Section: -5834mentioning

confidence: 99%

The Organization of the Actin Cytoskeleton in Vertical and Graviresponding Primary Roots of Maize

Blancaflor

Hasenstein

1997

Plant Physiology

View full text Add to dashboard Cite

“…The use of a fluorescent molecule, rhodamine, coupled to an actinspecific mycotoxin, phalloidin, to locate actin filament bundles in fixed pollen tubes grown in vitro •Was tirst demonstrated by Parthasarathy et al (1985). Using this technique observed strands and short segments of fluorescence along the length of pollen tubes from a Variety of plants.…”

Section: Cytoskeletonmentioning

confidence: 99%

Pollen tube tip growth

1989

View full text Add to dashboard Cite

summary This review considers pollen tube growth with regard to current information on pollen tube cytoplasm, wall structure and calcium ion interactions with pollen tubes. Pollen tubes have a marked cytoplasmic Polarity with a number of distinct zones along the tube, each with a characteristic complement of cytoplasmic and nuclear structures. The cytoplasmic structures are characteristic of secretory cells with extensive endoplasmic reticulum cisternae and numerous dictyosomes. The dictyosomes produce secretory vesicles that are mainly directed to the extending tip of the tube, where they provide new plasma membrane and wall components. The rates of secretory vesicle production and delivery have been estimated, allowing quantitative assessments of the rate of delivery of materials to the tip. Pollen tubes contain cytoskeletal components, with microtubules and microfilament strands lying axially in the main tube and diffuse microfilament strands at the tip. The tube wall consists of an outer fibrous layer containing pectins and an inner, more homogeneous layer containing callose and cellulose‐like microfibrils, possessing both β‐1,4 and β‐1,3 linkages. Protein is also present in the wall. The tube tip lacks the inner callosic wall. This type of structure is considered to be different from that of elongating sporophyte tissue cells which are enclosed by a wall containing layers of cellulose microfibrils. Calcium ions are required for pollen tube growth and, in at least some species, act as a chemotropic agent. High concentrations of calcium ions in the external medium inhibit growth. Pollen tubes contain some calcium ions bound to the cell wall and larger amounts located intracellularly, which enter the tube at the tip. This intracellular calcium is present as ions that exist freely within the cytoplasmic Matrix and as ions bound to membrane systems. The highest concentrations in both of these pools are found at the tip and in both they decline towards the base. The structure of the tip and the activity involved in providing components for plasma membrane and Wall assembly provide a basis for considering possible mechanisms of tip growth. Two hypotheses to account for the regulation of tip extension are considered, cell wall control and cytoskeletal control. In the cell wall hypothesis, control depends on an interaction between internal turgor pressure and a plastic cell wall. The mechanical properties of the wall are assumed to be partly dependent on the availability of external calcium ions to crosslink acidic pectin chains. According to this hypothesis, high external calcium ion concentrations cause cessation of tip growth due to increased mechanical resistance of the tip wall. Various observations on plant cell‐wall interactions with calcium ions and on experimentally‐treated pollen tubes provide evidence that does not support this hypothesis. The cytoskeletal control hypothesis of tip growth depends on the internal tip cytoskeleton to contain the tube tip cytoplasm against the internal turgor pressure during ...

show abstract

“…The presence of diverse microfilament configurations has been established in a majority of plant cell types (Pathsarathy et al, 1985;Meagher and Williamson, 1994;Kost et al, 1998;Mathur et al, 1999). Microfilament arrays govern important processes, including the determination of division plane during cytokinesis, cell elongation, and cell wall deposition, which are critical to plant development and cell differentiation .…”

Section: Introductionmentioning

confidence: 99%

Arabidopsis CAP Regulates the Actin Cytoskeleton Necessary for Plant Cell Elongation and Division

et al. 2002

View full text Add to dashboard Cite

Actin Network as a Normal Component of the Cytoskeleton in Many Vascular Plant Cells

Cited by 75 publications

References 0 publications

The Organization of the Actin Cytoskeleton in Vertical and Graviresponding Primary Roots of Maize

The Organization of the Actin Cytoskeleton in Vertical and Graviresponding Primary Roots of Maize

Pollen tube tip growth

Arabidopsis CAP Regulates the Actin Cytoskeleton Necessary for Plant Cell Elongation and Division

Contact Info

Product

Resources

About