Plant Growth in Relation to Endogenous Auxin, With Special Reference to Cereal Seedlings

Mer, C.

doi:10.1111/j.1469-8137.1969.tb06440.x

Cited by 21 publications

(13 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All seeds were imbibed and all plants were grown in absolute darkness for [2][3][4][5] days at 26 ± 10C. Oat, corn, and mung bean seedlings [Avena sativa-L., cv Lodi, lot 0170-B, and Zea mays L., WF9 X 38, from Dakota Seed and Grain (Watertown, SD); Phaseolus aureus L., purchased from a local grocery] were either used immediately or stored at 40C until used.…”

mentioning

confidence: 99%

Optical properties of etiolated plant tissues

Mandoli

Briggs

1982

Proc. Natl. Acad. Sci. U.S.A.

109

View full text Add to dashboard Cite

show abstract

mentioning

confidence: 99%

Optical properties of etiolated plant tissues

Mandoli

Briggs

1982

Proc. Natl. Acad. Sci. U.S.A.

109

View full text Add to dashboard Cite

show abstract

“…The curvature of the coleoptiles in this bioassay was originally (Went 1928, Went andThimann 1937) represented as being directly proportional to the concentration of applied IAA (at relatively low IAA concentrations). Several workers (Bottelier 1959, Mer 1969, Digby and Firn 1976, Jacobs 1979, Trewavas 1981 have proposed that this apparently linear relationship is due to anomalous or iticorrectly interpreted data. The concept of a linear dose response in the curvature test appears, nevertheless, to remain quite firmly entrenched.…”

Section: Resultsmentioning

confidence: 99%

Dose responses of auxins

Nissen

1985

Physiologia Plantarum

View full text Add to dashboard Cite

Published data for the most widely used bioassays for auxins as. well as other auxin‐induced responses, have been analyzed to determine whether the response is ultrasensitive, hyperbolic or subsensitive, i.e. whether the change from 10 to 90% of maximal response requires less than, equal to or more than an 81‐fold increase in external auxin concentration. Auxin‐dependent callus growth is most often ultrasensitive. Other responses, including the curvature of Avena coleoptiles, may show simple Mi‐chaelis‐Menten kinetics. In the majority of cases, however, the response is sub‐sensitive, often very markedly so. The finding of subsensitive responses is consistent with the proposal by A. J. Trewavas that plant development is regulated by changes in the sensitivity to plant growth substances. Detailed data for subsensitive dose responses, particularly auxin‐induced inhibition of root growth, can often be precisely represented by bi‐ or multiphasic isotherms, with the phases separated by sharp transitions. The relationship to auxin uptake and the relationship, if any, between carriers and receptors for auxins remain to be elucidated.

show abstract

“…Five-fold variations in diffusible auxin were accompanied by trivial (~ 10%) changes in coleoptile growth. Mer (1969) in a critical discussion of the Went & Thimann (1937) data pointed out that extension growth rates of excised coleoptiles were linearly dependent upon the logarithm of the auxin concentration. On this basis a 10-fold increase in in vivo growth rate should require approximately a 100-fold increase in diffusible auxin, which has never been observed.…”

Section: Does Auxin Have Anything To Do With Eontrolling Extension Grmentioning

confidence: 99%

“…Went & Thimann (1937) published some of the original data claiming this to be a linear response against auxin concentration. The subject has been discussed in detail by Jacobs (1979), Digby & Firn (1976) and Mer (1969). The apparent linearity is deceptive.…”

Section: Is Fruit Development Controlled By Seed-produced Auxins?mentioning

confidence: 99%

How do plant growth substances work?

Trewavas¹

1981

Plant Cell Environ

212

View full text Add to dashboard Cite

Despite intensive research effort, the role of growth substances in the life of the intact growing plant is far from clear. Two reasons are suggested which may account for the lack of progress. The first is the failure to recognize the unique aspects of plant development. These which are expressed by the regenerative, organizational and developmental plasticity of the meristem probably result from the possession of growth substances. The second is the concept of growth substances as hormones. This represents the main conceptual thrust of research and is considered critically, starting with the historical system, the coleoptile and dealing with other major growth substance systems in turn. It is concluded that a hormonal concept which includes control by changes in growth substance concentration fails to explain the developmental phenomena under examination. A role for growth substances as integrating agents is suggested and the notion of quantitative tissue sensitivity variation is developed to explain the major growth patterns of developing shoots.

show abstract

Plant Growth in Relation to Endogenous Auxin, With Special Reference to Cereal Seedlings

Cited by 21 publications

References 71 publications

Optical properties of etiolated plant tissues

Optical properties of etiolated plant tissues

Dose responses of auxins

How do plant growth substances work?

Contact Info

Product

Resources

About