Refilling of embolised conduits as a consequence of "Munch water" circulation

Teemu Hölttä, Timo Vesala, Martti Kimmo Perämäki, Eero Nikinmaa

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Sammanfattning

'Munch water' is pushed from the phloem to the xylem at locations of phloem sugar unloading. Consequently, an internal radial water potential imbalance is developed in the plant at these sugar-unloading sites. The phloem is at a higher water potential than the xylem. The magnitude of this radial water potential imbalance is determined by the magnitude of the radial water flux and the hydraulic resistance along the phloem-to-xylem pathway. If, as a result, the water potential in the ray parenchyma cells adjacent to xylem conduits is higher than that in the embolised xylem conduits, then a proportion of the water flow from the phloem would be directed towards embolised xylem conduits, in addition to conduits under tension. In this theoretical paper we demonstrate how recycled 'Munch water' passing from the phloem to the xylem can induce xylem embolism refilling. We also calculate the conditions and the structural composition of the phloem-to-xylem pathway that are required for embolism refilling by 'Munch water' circulation, and the time that is required for the complete refilling of embolised conduits in varying conditions.
Originalspråkengelska
TidskriftFunctional Plant Biology
Volym33
Utgåva10
Sidor (från-till)949-959
Antal sidor11
ISSN1445-4408
DOI
StatusPublicerad - 2006
MoE-publikationstypA1 Tidskriftsartikel-refererad

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title = "Refilling of embolised conduits as a consequence of {"}Munch water{"} circulation",
abstract = "'Munch water' is pushed from the phloem to the xylem at locations of phloem sugar unloading. Consequently, an internal radial water potential imbalance is developed in the plant at these sugar-unloading sites. The phloem is at a higher water potential than the xylem. The magnitude of this radial water potential imbalance is determined by the magnitude of the radial water flux and the hydraulic resistance along the phloem-to-xylem pathway. If, as a result, the water potential in the ray parenchyma cells adjacent to xylem conduits is higher than that in the embolised xylem conduits, then a proportion of the water flow from the phloem would be directed towards embolised xylem conduits, in addition to conduits under tension. In this theoretical paper we demonstrate how recycled 'Munch water' passing from the phloem to the xylem can induce xylem embolism refilling. We also calculate the conditions and the structural composition of the phloem-to-xylem pathway that are required for embolism refilling by 'Munch water' circulation, and the time that is required for the complete refilling of embolised conduits in varying conditions.",
keywords = "411 Agriculture and forestry",
author = "Teemu H{\"o}ltt{\"a} and Timo Vesala and Per{\"a}m{\"a}ki, {Martti Kimmo} and Eero Nikinmaa",
year = "2006",
doi = "10.1071/FP06108",
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Refilling of embolised conduits as a consequence of "Munch water" circulation. / Hölttä, Teemu; Vesala, Timo; Perämäki, Martti Kimmo; Nikinmaa, Eero.

I: Functional Plant Biology, Vol. 33, Nr. 10, 2006, s. 949-959.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

TY - JOUR

T1 - Refilling of embolised conduits as a consequence of "Munch water" circulation

AU - Hölttä, Teemu

AU - Vesala, Timo

AU - Perämäki, Martti Kimmo

AU - Nikinmaa, Eero

PY - 2006

Y1 - 2006

N2 - 'Munch water' is pushed from the phloem to the xylem at locations of phloem sugar unloading. Consequently, an internal radial water potential imbalance is developed in the plant at these sugar-unloading sites. The phloem is at a higher water potential than the xylem. The magnitude of this radial water potential imbalance is determined by the magnitude of the radial water flux and the hydraulic resistance along the phloem-to-xylem pathway. If, as a result, the water potential in the ray parenchyma cells adjacent to xylem conduits is higher than that in the embolised xylem conduits, then a proportion of the water flow from the phloem would be directed towards embolised xylem conduits, in addition to conduits under tension. In this theoretical paper we demonstrate how recycled 'Munch water' passing from the phloem to the xylem can induce xylem embolism refilling. We also calculate the conditions and the structural composition of the phloem-to-xylem pathway that are required for embolism refilling by 'Munch water' circulation, and the time that is required for the complete refilling of embolised conduits in varying conditions.

AB - 'Munch water' is pushed from the phloem to the xylem at locations of phloem sugar unloading. Consequently, an internal radial water potential imbalance is developed in the plant at these sugar-unloading sites. The phloem is at a higher water potential than the xylem. The magnitude of this radial water potential imbalance is determined by the magnitude of the radial water flux and the hydraulic resistance along the phloem-to-xylem pathway. If, as a result, the water potential in the ray parenchyma cells adjacent to xylem conduits is higher than that in the embolised xylem conduits, then a proportion of the water flow from the phloem would be directed towards embolised xylem conduits, in addition to conduits under tension. In this theoretical paper we demonstrate how recycled 'Munch water' passing from the phloem to the xylem can induce xylem embolism refilling. We also calculate the conditions and the structural composition of the phloem-to-xylem pathway that are required for embolism refilling by 'Munch water' circulation, and the time that is required for the complete refilling of embolised conduits in varying conditions.

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