2005
DOI: 10.1111/j.1365-3040.2005.01396.x
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Effects of cold‐girdling on flows in the transport phloem in Ricinus communis: is mass flow inhibited?

Abstract: The effects of cold girdling of the transport phloem at the hypocotyl of Ricinus communis on solute and water transport were investigated. Effects on the chemical composition of saps of phloem and xylem as well as of stem tissue were studied by conventional techniques and the water flow in the phloem was investigated by NMR imaging. Cold girdling reduced the concentration of sucrose but not that of inorganic solutes or amino acids in phloem saps. The possibility that cold treatment inhibited the retrieval of s… Show more

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Cited by 66 publications
(60 citation statements)
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References 40 publications
(65 reference statements)
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“…The markedly different transfer time of 13 C belowground between the two broadleaved species and the pine highlights differences in the velocity of photosynthate transport via the phloem sap between angiosperm and gymnosperm that were related to differences in phloem anatomy (Dannoura et al, 2011;Wingate et al, 2010). The doubling of time lag and peak time between summer and winter time, as well as the delayed peak time (more than 10 days in the resting season) were consistent with an effect of temperature on phloem loading, especially on retrieval after leaching (Peuke et al, 2006), on the viscosity of phloem sap (Hölttä et al, 2009) or on the carbohydrate sink strength (Wingate et al, 2010) that may affect the velocity of phloem sap (Dannoura et al, 2011).…”
Section: Transfer Time Of Carbon Belowgroundsupporting
confidence: 50%
“…The markedly different transfer time of 13 C belowground between the two broadleaved species and the pine highlights differences in the velocity of photosynthate transport via the phloem sap between angiosperm and gymnosperm that were related to differences in phloem anatomy (Dannoura et al, 2011;Wingate et al, 2010). The doubling of time lag and peak time between summer and winter time, as well as the delayed peak time (more than 10 days in the resting season) were consistent with an effect of temperature on phloem loading, especially on retrieval after leaching (Peuke et al, 2006), on the viscosity of phloem sap (Hölttä et al, 2009) or on the carbohydrate sink strength (Wingate et al, 2010) that may affect the velocity of phloem sap (Dannoura et al, 2011).…”
Section: Transfer Time Of Carbon Belowgroundsupporting
confidence: 50%
“…Subsequent investigations supported the notion that callose is formed in response to mechanical injury (Esau and Cheadle, 1961;Evert and Derr, 1964;Eschrich, 1975) and that the process can occur within seconds (Currier, 1957;Eschrich, 1965). Reductions of phloem conductivity after heat treatment (McNairn and Currier, 1968;McNairn, 1972) or localized chilling (Giaquinta and Geiger, 1973;Peuke et al, 2006) were also traced back to sieve plate pore constriction by callose formation. Investigations of callose formation by fluorescence intensity measurements suggested that burning leaf tips leads to distant callose formation (Furch et al, 2007).…”
Section: Introductionmentioning
confidence: 82%
“…Changing the osmotic pressure in the root medium might induce a response in the rate of refilling, which could indicate the possible role of root pressure. The effect of cold girdling of part of the stem (Peuke et al, 2006) and adding phloem flow results in addition to xylem flow could further indicate the role of starch-to-sugar conversion and transport into embolized conduits, assisted by phloem-driven radial, mass flow (Salleo et al, 2004). Probing radial water motion in refilling vessels with MRI could monitor whether refilling vessels are feeding intact vessels with water.…”
Section: Discussionmentioning
confidence: 99%