How do plant growth substances work?

Trewavas, Anthony

doi:10.1111/1365-3040.ep11610983

Cited by 212 publications

(29 citation statements)

References 115 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This point reflects the paucity of our current knowledge of how growth regulators work in healthy plants (144) . Virus infections might indeed be a useful experimental approach to the study of growth regulator function and metabolism .…”

Section: Discussionmentioning

confidence: 99%

Plant growth regulators and virus infection: A critical review

Fraser¹,

Whenham²

1982

Plant Growth Regul

View full text Add to dashboard Cite

Virus infection can severely inhibit plant growth and distort development . This article reviews changes in plant growth regulator metabolism caused by infection . In general, virus infection decreases auxin and gibberellin concentrations and increases abscisic acid concentration . Ethylene production is stimulated in necrotic or chlorotic reactions to infection, but not where the virus spreads systemically without necrosis . While these broad trends are true for most host-virus combinations studied, several situations are recorded where the virus had other effects on growth substance concentration . Cytokinin changes do not show any common pattern : both increases and decreases after infection have been reported .The extent to which virus-induced changes in growth substance concentration could be responsible for observed alterations in host growth and development is discussed . While changes in abscisic acid, gibberellin and ethylene production seem potentially important, the experimental evidence does not provide conclusive proof for control of growth by these changes .The numerous investigations of effects of exogenous regulators on virus multiplication and pathogenesis are reviewed . Different regulators, or the same regulator applied at different times or concentrations, had very diverse effects, and in some cases did significantly alter virus multiplication and pathogenesis . However, such studies seem to have yielded disappointingly little understanding of the biochemistry of the host-virus interaction, and the possible involvement of growth substances in this .Possible uses of plant growth regulators in chemotherapy of virus disease, and their possible involvement in natural or induced resistance mechanisms are discussed .

show abstract

Section: Discussionmentioning

confidence: 99%

Plant growth regulators and virus infection: A critical review

Fraser¹,

Whenham²

1982

Plant Growth Regul

View full text Add to dashboard Cite

show abstract

“…These mechanical stresses are sensed and the subsequent fine turning of expansion rates ensures coordinated growth. It has also been hypothesised [66,67] that this fine-tuning may be a function of auxin, smoothing out uncoordinated patterns of growth. The resulting auxin-induced cell synchronisation may then result in increased growth rates.…”

Section: Gravitropic Sensing May Be a Special Form Of Touch Sensingmentioning

confidence: 99%

Mechanical signalling, calcium and plant form

1994

View full text Add to dashboard Cite

Calcium is a dynamic signalling molecule which acts to transduce numerous signals in plant tissues. The basis of calcium signalling is outlined and the necessity for measuring and imaging of calcium indicated. Using plants genetically transformed with a cDNA for the calcium-sensitive luminescent protein, aequorin, we have shown touch and wind signals to immediately increase cytosol calcium. Touch and wind signal plant cells mechanically, through tension and compression of appropriate cells. Many plant tissues and cells are very sensitive to mechanical stimulation and the obvious examples of climbing plants, insectivorous species as well as other less well-known examples are described. Touch sensing in these plants may be a simple evolutionary modification of sensitive mechanosensing system present in every plant. The possibility that gravitropism may be a specific adaptation of touch sensing is discussed. There is a growing appreciation that plant form may have a mechanical basis. A simple mechanical mechanism specifying spherical, cylindrical and flat-bladed structures is suggested. The limited morphological variety of plant tissues may also reflect mechanical specification. The article concludes with a discussion of the mechanisms of mechanical sensing, identifying integrin-like molecules as one important component, and considers the specific role of calcium.

show abstract

“…As Trewavas [23] has pointed out, response to a plant hormone may involve increased biosynthesis, increased sensitivity to the hormone, or both. In ageing of some cut flowers there is a clear increase in sensitivity to ethylene [27,371.…”

Section: The Sensitivity Factorymentioning

confidence: 99%

Ethylene and flower senescence

Reid

1992

Plant Growth Regul

154

View full text Add to dashboard Cite

The end of the relatively short life of carnations held in air is associated with climacteric rises in ethylene production and respiration, and coordinate rises in activity of the enzymes of the ethylene biosynthetic pathway. Carnation sensescence is associated with derepression of specific genes, increased polyribosome activity, and major changes in patterns of protein synthesis. Isotopic competition assays indicate the presence in carnation petals of ethylene binding activity with the expected characteristics of the physiological ethylene receptor. Inhibition of ethylene production and/or ethylene binding (whether in selected varieties, or by treatment with chemicals) results in longer-lived carnations. Examination of other flowers shows that the carnation is not a universal paradigm for flower senescence. The response to ethylene varies widely, and in many species petal wilting occurs without any apparent involvement of ethylene.

show abstract

How do plant growth substances work?

Cited by 212 publications

References 115 publications

Plant growth regulators and virus infection: A critical review

Plant growth regulators and virus infection: A critical review

Mechanical signalling, calcium and plant form

Ethylene and flower senescence

Contact Info

Product

Resources

About