A Reanalysis of Particle Motion in Sieve Tubes of Heracleum

Murphy, Ricardo

doi:10.1093/oxfordjournals.aob.a087149

Cited by 5 publications

(2 citation statements)

References 15 publications

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“…starch grains from disrupted SE plastids) in sieve tubes and concluded that the viscosity is much higher than that of a 20% sucrose solution. Murphy (1986) reanalysed these data and argued that Barclay & Johnson (1982) had underestimated the degree of motion, and that they had studied severed, non‐functional sieve tubes (indicated by the disruption of SE plastids). He concluded that the viscosity was below 3 × 10 −3 Pa s −1 .…”

Section: Viscosity – Does the Cargo Control Its Own Transport Rate?mentioning

confidence: 99%

Münch, morphology, microfluidics - our structural problem with the phloem

Knoblauch

Peters

2010

Plant, Cell &Amp; Environment

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The sieve tubes of the phloem are enigmatic structures.Their role as channels for the distribution of assimilates was established in the 19th century, but their sensitivity to disturbations has hampered the elucidation of their transport mechanisms and its regulation ever since. Ernst Münch's classical monograph of 1930 is generally regarded as the first coherent theory of phloem transport, but the 'Münchian' pressure flow mechanism had been discussed already before the turn of the century. Münch's impact rather rested on his simple physical models of the phloem that visualized pressure flow in an intuitive way, and we argue that the downscaling of such models to realistic, low-Reynolds-number sizes will boost our understanding of phloem transport in this century just as Münch's models did in the previous one. However, biologically meaningful physical models that could be used to test predictions of the many existing mathematical models would have to be designed in analogy with natural phloem structures. Unfortunately, the study of phloem anatomy seems in decline, and we still lack basic quantitative data required for evaluating the plausibility of our theoretical deductions. In this review, we provide a subjective overview of unresolved problems in angiosperm phloem structure research within a functional context.

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Section: Viscosity – Does the Cargo Control Its Own Transport Rate?mentioning

confidence: 99%

Münch, morphology, microfluidics - our structural problem with the phloem

Knoblauch

Peters

2010

Plant, Cell &Amp; Environment

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“…Fensom et al (1968) estimated a streaming rate of about 1 cm h -1 . Other studies have been conducted, mainly at Mount Alliston University in Sackville NB, using H. mantegazzianum as a research tool to elucidate the underlying forces governing mass flow (Tyree and Fensom 1970;Spanner 1970), determine the nature of particles observed in phloem (Lee et al 1971;Hart and Sabnis 1975;Barclay et al 1977;Murphy 1986), and gain further insight into energy transfers in active phloem (Ezeala et al 1974).…”

Section: Historymentioning

confidence: 99%

The Biology of Invasive Alien Plants in Canada. 4. Heracleum mantegazzianum Sommier & Levier

Page

Wall

Darbyshire³

et al. 2006

Can. J. Plant Sci.

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Heracleum mantegazzianum Sommier & Levier. Can. J. Plant Sci. 86: 569-589. Heracleum mantegazzianum (giant hogweed) is an invasive alien plant of management concern in southern Canada where it has escaped from horticulture and established and spread in natural, ruderal, and agricultural ecosystems. It poses a threat to natural ecosystems and human health, and is also a weed in agricultural and urban areas. It is a member of the Carrot family (Apiaceae) and is closely related to the native species Heracleum maximum Bartram (cow-parsnip). It is a monocarpic perennial, which generally flowers in its 3rd or 4th year. Large size, leaf shape, dark reddish pigments in patches on stems and petioles, and fruit characteristics readily distinguish H. mantegazzianum from other plants in Canada. It is increasingly common in riparian areas, floodplains, and forest edges in or near urban areas in southwestern British Columbia and southern Ontario. Based on herbarium specimens, H. mantegazzianum was first recorded in Ontario in 1949, British Columbia in 1964, Nova Scotia in 1980, Quebec in 1990, and New Brunswick in 2000. The development of dense stands of H. mantegazzianum can also reduce the richness of native plants. Contact with H. mantegazzianum can cause phytophotodermatitis, a serious skin inflammation caused by UV photo-activation of furanocoumarins present in the sap. Control methods include herbicide application, mechanical cutting, and animal grazing, but strategies to address seed dispersal and re-establishment from dormant seed must also be adopted. Widespread establishment in southern Canada suggests that eradication is unlikely. However, range expansion and rapid population growth can be prevented through strategic management including public education. Heracleum mantegazzianum (berce du Caucase) est une espèce exotique envahissante qui préoccupe les producteurs du sud du Canada, car la plante s'est échappée des jardins pour coloniser les écosystèmes naturels, rudéraux et agricoles. En plus d'être une adventice dans les régions agricoles et urbaines, l'espèce s'avère une menace pour les écosystèmes naturels et la santé humaine. Membre de la famille de la carotte (Apiacées), la berce du Caucase est étroitement apparentée à l'espèce indigène Heracleum maximum Bartram (berce laineuse). Cette vivace monocarpienne fleurit habituellement la troisième ou la quatrième année. Il est facile de la distinguer des autres plantes à cause de sa grande taille, de la forme de ses feuilles, des taches rouge foncé sur la tige et les pétioles et des fruits très caractéristiques. On la trouve de plus en plus dans les habitats riverains, les plaines inondables et la lisière des forêts, ou à proximité des zones urbaines dans le sud-ouest de la ColombieBritannique et le sud de l'Ontario. D'après les spécimens conservés dans les herbiers, H. mantegazzianum a été identifiée pour la première fois en 1949 en Ontario, en 1964 en Colombie-Britannique, en 1980 en Nouvelle-Écosse, en 1990 au Québec et en 2000 au Nouveau-Brunswick. Le développem...

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Dicotyledons

Evert¹

1990

Sieve Elements

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A Reanalysis of Particle Motion in Sieve Tubes of Heracleum

Cited by 5 publications

References 15 publications

Münch, morphology, microfluidics - our structural problem with the phloem

Münch, morphology, microfluidics - our structural problem with the phloem

The Biology of Invasive Alien Plants in Canada. 4. Heracleum mantegazzianum Sommier & Levier

Dicotyledons

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