The Control of Plant Cell Elongation by Auxin and Gibberellin

Jones, Russell L.

doi:10.1007/978-3-642-71018-6_36

Cited by 8 publications

(8 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Auxin, cytokinins and gibberellins influence cell division and elongation (Jones 1985). In a collection of genotypes of Lycopersicon pitnpinellifolium a positive correlation between fruit size, cell number, cell size and GA, concentration was found (Bohner andBangerth 1988, Bohner et al 1988).…”

mentioning

confidence: 96%

Effects of exogenously applied growth regulators on shoot growth of inbred lines of Plantago major differing in relative growth rate: differential response to gibberellic acid and (2‐chloroethyl)‐trimethyl‐ammonium chloride

Dijkstra

Kuiper

1989

Physiologia Plantarum

View full text Add to dashboard Cite

The possibility of modulating shoot growth charaeteristics of seedlings of two inbred lines of Plantago major L., differing in relative growth rate (RGR), by exogenously applied 6‐benzylaminopurine (BA), α‐naphthalene acetic acid (NAA), (gibberellic acid (GA3) and (2‐chloroethyl)‐trimethyl‐ammonium chloride (CCC) was investigated. BA completely inhibited growth of the shoot at a concentration of 1 mM, while lower concentrations had no effect. NAA reduced growth of the shoot at 10 üM, while 1 mM completely inhibited growth. Addition of 10 μM GA3 or higher stimulated shoot fresh weight up to 20% and leaf area up to 30% for the slow growing inbred line (W9), but less for the fast growing line (A4). Application of 1 mM CCC, an inhibitor of gibberellin metabolism, reduced growth of both inbred lines, but to a larger extent in the fast growing seedlings. The lower shoot growth of W9 was associated with a lower specific leaf area (SLA) and a higher dry matter percentage of the shoot, as compared with A4. NAA reduced growth by reducing SLA and increasing leaf thickness, but the percentage dry matter of the leaves was unaffected. Stimulation of the shoot growth by GA3 application was associated with higher SLA and lower dry matter percentage. Application of CCC had opposite effects on SLA and dry matter percentage as compared with GA3. GA seems to be involved in the regulation of at least part of the genetic difference in RGR in Plantago major.

show abstract

mentioning

confidence: 96%

Effects of exogenously applied growth regulators on shoot growth of inbred lines of Plantago major differing in relative growth rate: differential response to gibberellic acid and (2‐chloroethyl)‐trimethyl‐ammonium chloride

Dijkstra

Kuiper

1989

Physiologia Plantarum

View full text Add to dashboard Cite

show abstract

“…A plants often results in increased shoot growth (Rood et relation between low growth rate and low GA content al. 1983b, Jones 1986, Phinney et al 1986 was also evident in wheat as affected by low temper-Saftner 1987). The addition of GA, to a slow-growing atures (Pinthus et al 1989).…”

mentioning

confidence: 98%

Relation between relative growth rate, endogenous gibberellins, and the response to applied gibberellic acid for Plantago major

Dijkstra¹,

Reegen²,

Kuiper³

1990

Physiol Plant

View full text Add to dashboard Cite

Relationships between relative growth rate (RGR), endogenous gibberellin (GA) concentration and the response to application of gibberellic acid (GA(3) ) were studied for two inbred lines of Plantago major L., which differed in RGR. A4, the fast-growing inbred line, had a higher free GA concentration than the slow-growing W9, as analyzed by enzyme immunoassay. GA(3) application increased total plant weight and RGR(3) particularly for the slow-growing line. Chlorophyll a content and photosynthetic activity per unit leaf area were decreased, while transpiration rate was unaffected by GA(3) application. The increase in RGR by GA(3) application was associated with an increased leaf weight ratio; specific leaf area and percentage of dry matter in the leaves were only temporarily affected. Root respiration rate per unit dry weight was unaffected. The correlation between low RGR, low GA concentration and high responsiveness to applied GA(3) supports the contention that gibberellins are involved in the regulation of RGR. However, the transient influence of GA(3) application on some growth components suggests the involvement of other regulatory factors in addition to GA.

show abstract

“…This bending technique is subject to various criticisms; nevertheless, other mechanical techniques have provided additional evidence that GA makes the wall more extensible in oat internodes (1), lettuce hypocotyls (16,18,27), and pea apical hooks (22). However, the biochemical basis for the altered wall remains uncertain; it might result from enhanced wall loosening, reduced wall cross-linking, or altered wall composition (14,15).…”

mentioning

confidence: 99%

Mechanism of Gibberellin-Dependent Stem Elongation in Peas

Cosgrove¹,

Sovonick-Dunford²

1989

Plant Physiol.

View full text Add to dashboard Cite

Stem elongatfon in peas (Pisum sativum L.) is under partial control by gibberellins, yet the mechanism of such control is uncertain. In this study, we examined the cellular and physical properties that govem stem elongation, to determine how gibberellins influence pea stem growth. Stem elongation of etiolated seedlings was retarded with uniconozol, a gibberellin synthesis inhibitor, and the growth retardation was reversed by exogenous gibberellin. Using the pressure probe and vapor pressure osmometry, we found little effect of uniconozol and gibberellin on cell turgor pressure or osmotic pressure. In contrast, these treatments had major effects on in vivo stress relaxation, measured by turgor relaxation and pressure-block techniques. Uniconozoltreated plants exhibited reduced wall relaxation (both initial rate and total amount). The results show that growth retardation is effected via a reduction in the wall yield coefficient and an increase in the yield threshold. These effects were largely reversed by exogenous gibberellin. When we measured the mechanical characteristics of the wall by stress/strain (Instron) analysis, we found only minor effects of uniconozol and gibberellin on the plastic compliance. This observation indicates that these agents did not alter wall expansion through effects on the mechanical (viscoelastic) properties of the wall. Our results suggest that wall expansion in peas is better viewed as a chemorheological, rather than a viscoelasfic, process.Gibberellins were discovered because of their marked stimulation of shoot elongation. In recent years notable progress has been made in the genetics of gibberellin synthesis and its control of shoot elongation, particularly in pea and maize plants (see Ref. 20 for review). However, the mechanism of action of GA on shoot growth in these species is not fully understood. Two general, and complementary, approaches have been taken to examine GA action. The first views the stem as composed of cell files, and asks how GA affects the number and final size ofthe cells making up the stem. Various studies (e.g. 24, 26) have shown that GA may affect both cell division and final cell size. However, final cell size is a complex function of the patterns of cell expansion and cell division, which are themselves likely to be interdependent, so the causal mechanism of GA action is not clear from these studies. The second approach considers that stem elongation '

show abstract

The Control of Plant Cell Elongation by Auxin and Gibberellin

Cited by 8 publications

References 39 publications

Effects of exogenously applied growth regulators on shoot growth of inbred lines of Plantago major differing in relative growth rate: differential response to gibberellic acid and (2‐chloroethyl)‐trimethyl‐ammonium chloride

Effects of exogenously applied growth regulators on shoot growth of inbred lines of Plantago major differing in relative growth rate: differential response to gibberellic acid and (2‐chloroethyl)‐trimethyl‐ammonium chloride

Relation between relative growth rate, endogenous gibberellins, and the response to applied gibberellic acid for Plantago major

Mechanism of Gibberellin-Dependent Stem Elongation in Peas

Contact Info

Product

Resources

About