Signal Perception and Transduction: The Origin of the Phenotype.

Trewavas, Anthony; Malhó, Rui

doi:10.1105/tpc.9.7.1181

Cited by 254 publications

(151 citation statements)

References 80 publications

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“…Modulation of the cytoskeleton appears as network-regulated (Pfaffmann & Conrad 2000). In plant cells, the secondary signal transduction pathways from hormone receptors also show a large redundancy (Trewavas & Malho 1997). Even cellular perception of the hormonal signal displays dual modes in plant cells, involving both doseresponse and change in sensitivity (Guern 1987;Trewavas 1991).…”

Section: The Reality Of Redundancymentioning

confidence: 99%

Data analysis in plant physiology: are we missing the reality?

Amzallag

2001

Plant Cell & Environment

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In plant physiology, data analysis is based on the comparison of mean values. In this perspective, variability around the mean value has no significance per se , but only for estimating statistical significance of the difference between two mean values. Another approach to variability is proposed here, derived from the difference between redundant and deterministic patterns of regulation in their capacity to buffer noise. From this point of view, analysis of variability enables the investigation of the level of redundancy of a regulation pattern, and even allows us to study its modifications. As an example, this method is used to investigate the effect of brassinosteroids (BSs) during vegetative growth in Sorghum bicolor . It is shown that, at physiological concentrations, BSs modulate the network of regulation without affecting the mean value. Thus, it is concluded that the physiological effect of BSs cannot be revealed by comparison of mean values. This example illustrates how a part of the reality (in this case, the most relevant one) is hidden by the classical methods of comparison between mean values. The proposed tools of analysis open new perspectives in understanding plant development and the nonlinear processes involved in its regulation. They also ask for a redefinition of fundamental concepts in physiology, such as growth regulator, optimality, stress and adaptation.

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Section: The Reality Of Redundancymentioning

confidence: 99%

Data analysis in plant physiology: are we missing the reality?

Amzallag

2001

Plant Cell & Environment

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“…In L. uniflora there is no ontogenetic sequence of leaf forms irrespective of whether the plant is growing submersed or on land, and the observed morphological plasticity must therefore have been triggered by some external and\or internal stimuli. Experimental work with other species suggests that leaf morphology can respond to photoperiod, temperature, light regime, CO # and O # concentration, moisture conditions and mechanical pressure, and that the response might be mediated by plant growth substances (see, for example, Bradshaw, 1965 ;Sculthorpe, 1967 ;Bristow, 1969 ;Anderson, 1978 ;Bodkin et al, 1980 ;Deschamp & Cooke, 1983 ;Goliber & Feldman, 1989 ;Maberly & Spence, 1989 ;He, Morgan & Drew, 1996 ;Hellwege, Dietz & Hartung, 1996 ;Trewavas & Mulho! , 1997).…”

Section: Changes In Leaf Morphology and Growth Form Following Emersiomentioning

confidence: 99%

Adaptations for an amphibious life: changes in leaf morphology, growth rate, carbon and nitrogen investment, and reproduction during adjustment to emersion by the freshwater macrophyte Littorella uniflora

Robe

Griffiths

1998

New Phytologist

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Littorella uniflora (L.) Ascherson is a small, perennial, amphibious rhizophyte of rosette life-form which is common along the margins of lakes, tarns and reservoirs where water-level fluctuations are often rapid and unpredictable. The majority of plants are continuously submersed and reproduce vegetatively, but a small proportion become completely emersed for variable lengths of time, when flowering and seed set occur. To find out how L. uniflora adjusts to sudden emersion we studied the plants at a reservoir where water level falls each spring and remains low throughout the summer ; L. uniflora adjusted very quickly showing a degree of phenotypic plasticity not expected in a ' stress tolerator ', including the production of a new set of terrestrial leaves with reduced lacunal volume and increased stomatal density, a rapid increase in leaf growth rate, and flowering within 3-4 wk. Comparison of terrestrial L. uniflora with aquatic plants growing permanently submersed in lake and tarn habitats showed that three to fourfold more carbon (C) and nitrogen (N) was incorporated into above-ground biomass by emersed plants. However, ramet production in the aquatic environment appeared to be more costly, in terms of C and N invested, than terrestrial flower and seed production. The combination of continuous, submersed vegetative spread with the capacity for a high degree of phenotypic plasticity allowing some flower and seed production to occur during brief periods of emersion seems to account for the success of this plant in the amphibious niche.Key words : Littorella uniflora (L.) Ascherson (Shoreweed), aquatic macrophyte, emersion, heterophylly, seasonal growth. There are many species of higher plant which lead an amphibious existence. These plants have evolved from terrestrial ancestors and show varying degrees of specialization for aquatic life, from species which tolerate only short periods of submersion to others which complete their whole life cycle under water (Arber, 1920 ;Sculthorpe, 1967 ;.

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“…Transient cytosolic influxes of Ca 2ϩ are involved in plant responses to various environmental stimuli (Hepler and Wayne, 1985;Bush, 1995;Trewavas, 1997). These changes in the intracellular Ca 2ϩ concentration are perceived by Ca 2ϩ -binding proteins, which in turn activate signaling cascades involving protein kinases and protein phosphatases (Poovaiah and Reddy, 1993).…”

mentioning

confidence: 99%

Spatio-Temporal Accumulation and Activity of Calcium-Dependent Protein Kinases during Embryogenesis, Seed Development, and Germination in Sandalwood

2000

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Western-blot analysis and protein kinase assays identified two Ca 2؉ -dependent protein kinases (CDPKs) of 55 to 60 kD in soluble protein extracts of embryogenic cultures of sandalwood (Santalum album L.). However, these sandalwood CDPKs (swCDPKs) were absent in plantlets regenerated from somatic embryos. swCDPKs exhibited differential expression (monitored at the level of the protein) and activity in different developmental stages. Zygotic embryos, seedlings, and endosperm showed high accumulation of swCDPK, but the enzyme was not detected in the soluble proteins of shoots and flowers. swCDPK exhibited a temporal pattern of expression in endosperm, showing high accumulation and activity in mature fruit and germinating stages; the enzyme was localized strongly in the storage bodies of the endosperm cells. The study also reports for the first time to our knowledge a post-translational inhibition/inactivation of swCDPK in zygotic embryos during seed dormancy and early stages of germination. The temporal expression of swCDPK during somatic/zygotic embryogenesis, seed maturation, and germination suggests involvement of the enzyme in these developmental processes.

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Signal Perception and Transduction: The Origin of the Phenotype.

Cited by 254 publications

References 80 publications

Data analysis in plant physiology: are we missing the reality?

Data analysis in plant physiology: are we missing the reality?

Adaptations for an amphibious life: changes in leaf morphology, growth rate, carbon and nitrogen investment, and reproduction during adjustment to emersion by the freshwater macrophyte Littorella uniflora

Spatio-Temporal Accumulation and Activity of Calcium-Dependent Protein Kinases during Embryogenesis, Seed Development, and Germination in Sandalwood

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