Differential Growth in Plant Tissues

Thimann, Kenneth V.; Schneider, Charles L.

doi:10.2307/2436524

Cited by 59 publications

(49 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In an analysis of differential growth in coleoptiles, Thimann and Schneider (19) found that the epidermal cells were under tension, while the inner cells were under compression during elongation. This means that a growth-limiting phenomenon was more advanced in the epidermal cells than in the inner cells, and it is the outer cells which apparently contain lignin.…”

Section: Discussionmentioning

confidence: 99%

Lignin Formation in Wheat Coleoptile Cell Walls

Whitmore¹

1971

Plant Physiol.

View full text Add to dashboard Cite

Four growth-influencing compounds-hydroxyproline, 2,2'-dipyridyl, 2-chloroethylphosphonic acid, and indoleacetic acid-were used to examine the relationship between lignin formation and growth of wheat coleoptile sections. Hydroxyproline and 2-chloroethylphosphonic acid, at low concentrations, inhibited growth and increased lignin content. Dipyridyl, which promoted coleoptile elongation, decreased lignin content. Indoleacetic acid caused a 300% increase in growth at 0.1 mM but resulted in lignin content no different from controls with no auxin. Chemical and anatomical evidence is given which indicates that lignin is present in the epidermal cell walls of the wheat coleoptile. It is thus possible that bonding between lignin and hemicellulose may have some influence on coleoptile growth. Wardrop (20) has hypothesized that lignification may limit enlargement of plant cells by immobilizing the hemicellulose matrix, thereby preventing surface growth. His suggestion pertained to woody cells which undergo secondary wall thickening, and in which lignin forms a major component of the cell wall. Coleoptile cells, however, also have a secondary type of wall layer which is formed at the end of the extension phase (1). Experiments described in this report show that lignin may be synthesized in the epidermal cells of the wheat coleoptile. As a result of bonding between lignin and hemicellulose (5, 7), factors which control lignification may thereby influence the termination of elongation of coleoptile cells. The relationship between lignin biosynthesis and coleoptile elongation was investigated.MATERIALS AND METHODS Incubation and Nitrobenzene Oxidation. Wheat seeds (Triticunz vulgare cultivar Knox or Redcoat) were grown for 72 hr in the dark in vermiculite. Coleoptile sections 9 mm long were cut 3 mm from the tips, and the leaves were removed. The sections were floated in water for 1 to 2 hr before the treatment incubation. Twenty-five to 50 sections were incubated in 50-ml Erlenmeyer flasks in 2-to 4-ml solutions. The basic medium for incubation was 50 mm sucrose; 2.5 mm potassium maleate buffer, pH 4.8; the lignin precursor U-"C-Lphenylalanine, 15

show abstract

Section: Discussionmentioning

confidence: 99%

Lignin Formation in Wheat Coleoptile Cell Walls

Whitmore¹

1971

Plant Physiol.

View full text Add to dashboard Cite

show abstract

“…At the heart of these papers lies the observation that different isolated tissues exhibit different growth rates, and hence are under differential tension (Sachs, 1882 and 1875 in [11] and [10] respectively). Plant cells are immotile and glued together through their walls, necessitating that they grow together.…”

Section: The Epidermis As a Barrier -A Biophysical Viewmentioning

confidence: 99%

“…Seventy years ago, Thimann proposed that differential tissue tension in cylindrical elongating organs is a result of differential sensitivity to auxin [11]. Using microsurgery and explants, he then showed that the inner layers were more sensitive to a given auxin concentration then the epidermis.…”

Section: Epidermis Control Of Cell Expansion -The Hormone Aspectmentioning

confidence: 99%

Growth coordination and the shoot epidermis

Savaldi-Goldstein

Chory

2008

Current Opinion in Plant Biology

View full text Add to dashboard Cite

SummaryCell-cell communication is essential for growth and development of multicellular organisms. In higher plants, the shoot organs are derived from three clonally distinct cell layers present in the meristem. The role of the outermost L1 cell-layer and its derived epidermis in coordinating growth of the inner cell-layers has long been debated. This question has been revisited recently using molecular tools to manipulate cell cycle progression or cell expansion, specifically in the epidermis. These studies conclude that cells in the epidermis both promote and restrict growth of the entire shoot by sending growth signals-either physical or chemical-to the inner layers.

show abstract

“…Details of the methods have previously been given (21,24,25). Since the slit pea stem curvature is, on the whole, the least selective (25) it was generally used for the 1st screening.…”

Section: Miaterials and Miethodsmentioning

confidence: 99%