Hormonal and Gravitropic Specificity in the Regulation of Growth and Cell Wall Synthesis in Pulvini and Internodes from Shoots of Avena sativa L. (Oat)

Montague, Michael J.

doi:10.1104/pp.107.2.553

Cited by 8 publications

(12 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similarly, the extensibility of the cell wall of the convex side was higher than that of the concave side in gravi-stimulated stems (Shen-MiUer and Masuda 1973, Iwami and Masuda 1974, Cosgrove 1990, Bagshaw and Cleland 1990 and corresponding differential modifications of the cell wall metabolism have been reported in gravitropism (Gibeaut et a/. 1990, Talbott and Pickard 1994, Montague 1995, Edelmann and Sievers 1995. …”

mentioning

confidence: 84%

Apoplast as the site of response to environmental signals

Hoson

1998

J. Plant Res.

116

View full text Add to dashboard Cite

When the life cycle of plants is influenced by various environmental signals, the mechanical properties of the cell wall are greatly changed. These signals also modify the levels and structure of the cell wall constituents and such modifications are supposed to be the cause of the changes in the wall mechanical properties. These changes in the cell wall, the major component of the apoplast, can be recognized as the response of plants to environmental signals. The analysis of the mechanism leading to the response suggests that the apoplast is involved not only in the response but also in the perception and transduction of environmental signals in concert with the receptors of signals located on the plasma membrane. Thus, the apoplast plays a principal role in the communication of plants with the outer world and enables the plants to adapt themselves and survive in the environment full of stresses.

show abstract

mentioning

confidence: 84%

Apoplast as the site of response to environmental signals

Hoson

1998

J. Plant Res.

116

View full text Add to dashboard Cite

show abstract

“…Oat plants (A. sativa L. cv Victory; seed graciously supplied by Svalöf AB International, Svalöv, Sweden) were grown in 15-cm pots (200 seeds/pot) in a growth chamber (16 h light/8 h dark; 18°C/16°C) with a light intensity of 800 E. Shoots were selected after about 45 days of growth so that the internode immediately below the peduncular node (p-1 internode) had reached a length between approximately 10 and 40 mm, thereby ensuring maximum growth response to GA 3 (Adams et al 1973) as well as adequate gravitropic response (Montague 1995b). (For convenience, collected shoots were routinely held at 4°C for several days until further preparation.…”

Section: Plantsmentioning

confidence: 99%

“…Glc was supplied at the maximally effective concentration of 0.1 M (Adams et al 1973). Neither buffer nor other added ions were included in the medium because results from previous work (Montague 1993(Montague , 1995a(Montague , 1995b consistently showed that they had no effect on the maximum growth response in this system. (At the concentrations tested, the hormones did not appreciably affect the initial pH of the growth medium, which was about 5.5.)…”

Section: Tissue Preparation and Growth Conditionsmentioning

confidence: 99%

“…As defined above, the oat stem segment therefore possesses two distinct hormonally sensitive tissues. Each tissue responds to its own appropriate stimulus (the internodal tissue to GA, the pulvinar tissue to auxin and gravistimulus) with enhanced cell elongation, accompanied by cell wall synthesis, but without the complication of concomitant cell division (Kaufman et al 1969, Dayanandan et al 1976, Montague 1995b. Because the two tissues are closely connected via anastomosing vasculature (Montague et al 1973, Montague 1995b, they are exposed simultaneously to any exogenous substance supplied through the node.…”

mentioning

confidence: 99%

“…Each tissue responds to its own appropriate stimulus (the internodal tissue to GA, the pulvinar tissue to auxin and gravistimulus) with enhanced cell elongation, accompanied by cell wall synthesis, but without the complication of concomitant cell division (Kaufman et al 1969, Dayanandan et al 1976, Montague 1995b. Because the two tissues are closely connected via anastomosing vasculature (Montague et al 1973, Montague 1995b, they are exposed simultaneously to any exogenous substance supplied through the node. Given these anatomic characteristics, the system provides a unique opportunity to compare the possible roles of JA and ABA in the regulation of cellular elongation in mature grass shoots by investigating two different growth-capable tissues, each with its own specific hormonal responsiveness, in the same isolated plant part.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Exogenous Jasmonic and Abscisic Acids Act Differentially in Elongating Tissues from Oat Stem Segments

Montague

1997

J Plant Growth Regul

Self Cite

View full text Add to dashboard Cite

Segments can be cut from the peducular-1 internode of oat (Avena sativa L.) shoots so as to contain the graviresponsive, auxin-sensitive leaf sheath pulvinus, and the gibberellin-sensitive internodal tissue. These two growth-capable tissues were used to study the effects and interactions of jasmonic acid (JA) and abscisic acid (ABA) in regulating cell elongation. When supplied alone at physiologic concentrations (10 −5 , 10 −4 M), JA promoted growth and cell wall synthesis in the internodal tissue, whereas by itself, ABA inhibited internodal elongation and even inhibited JA-promoted growth. When gibberellic acid (GA 3 ) was used to stimulate internodal elongation, JA and ABA caused similar levels of inhibition and, at certain concentrations, were synergistic. Inhibition by ABA was initiated several hours earlier than inhibition by JA, and only the ABA effect could be partially overcome by 10 −3 M aminoethoxyvinylglycine. Both JA and ABA inhibited elongation of pulvinar tissue that was induced to grow by gravistimulus or auxin, although here JA was more potent than ABA at equimolar concentrations. When 10 −5 M fusicoccin was used as a general nonphysiologic growth stimulus, JA had no effect on the internode but inhibited the pulvinus, whereas ABA had no effect on the pulvinus but inhibited the internode. These results provide strong physiologic evidence that JA and ABA act by different mechanisms in the regulation of elongation, at least in this representative grass.

show abstract

Rhythmic Leaf Movements: Physiological and Molecular Aspects

Moran

2015

Rhythms in Plants

View full text Add to dashboard Cite

Hormonal and Gravitropic Specificity in the Regulation of Growth and Cell Wall Synthesis in Pulvini and Internodes from Shoots of Avena sativa L. (Oat)

Cited by 8 publications

References 30 publications

Apoplast as the site of response to environmental signals

Apoplast as the site of response to environmental signals

Exogenous Jasmonic and Abscisic Acids Act Differentially in Elongating Tissues from Oat Stem Segments

Rhythmic Leaf Movements: Physiological and Molecular Aspects

Contact Info

Product

Resources

About