Long-distance transport of pertechnetate in the moonflower (Ipomoea alba)

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Abstract

The first research on the transport of metastable-technetium-99 (99mTc) in the form of pertechnetate (99mTcO4-) within plants suggested that 99mTcO4- may be mobile in the phloem. In contrast, more recent evidence indicates the anion is transported in the xylem. Here we demonstrate that observations of 99mTc transport in the test subject of these initial investigations, the moonflower (Ipomoea alba L.), are incompatible with phloem flow. Rather, the presence of only minute amounts of 99mTc in typical sinks for phloem solutes and 99mTc transport out of labeled leaves when shaded but not when illuminated strongly suggest that the radionuclide is transported in the xylem. The study increases confidence in the identification of 99mTcO4- as a xylem mobile compound whose distribution in plants can be visualized using nuclear medicine scintigraphic imaging techniques.
Original languageEnglish
Pages (from-to)54-58
Number of pages5
JournalJournal of Environmental Radioactivity
Volume103
Issue number1
DOIs
Publication statusPublished - Jan 2012

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Ipomoea
Technetium
Nuclear medicine
Sodium Pertechnetate Tc 99m
phloem
xylem
Phloem
Radioisotopes
Xylem
Negative ions
Imaging techniques
technetium isotope
Plant Dispersal
medicine
radionuclide
anion
solute
Nuclear Medicine
Anions
long-distance transport

Cite this

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title = "Long-distance transport of pertechnetate in the moonflower (Ipomoea alba)",
abstract = "The first research on the transport of metastable-technetium-99 (99mTc) in the form of pertechnetate (99mTcO4-) within plants suggested that 99mTcO4- may be mobile in the phloem. In contrast, more recent evidence indicates the anion is transported in the xylem. Here we demonstrate that observations of 99mTc transport in the test subject of these initial investigations, the moonflower (Ipomoea alba L.), are incompatible with phloem flow. Rather, the presence of only minute amounts of 99mTc in typical sinks for phloem solutes and 99mTc transport out of labeled leaves when shaded but not when illuminated strongly suggest that the radionuclide is transported in the xylem. The study increases confidence in the identification of 99mTcO4- as a xylem mobile compound whose distribution in plants can be visualized using nuclear medicine scintigraphic imaging techniques.",
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Long-distance transport of pertechnetate in the moonflower (Ipomoea alba). / Clarke, Simon; Rogiers, Suzy; Currie, Geoffrey.

In: Journal of Environmental Radioactivity, Vol. 103, No. 1, 01.2012, p. 54-58.

Research output: Contribution to journalArticle

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AU - Currie, Geoffrey

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AB - The first research on the transport of metastable-technetium-99 (99mTc) in the form of pertechnetate (99mTcO4-) within plants suggested that 99mTcO4- may be mobile in the phloem. In contrast, more recent evidence indicates the anion is transported in the xylem. Here we demonstrate that observations of 99mTc transport in the test subject of these initial investigations, the moonflower (Ipomoea alba L.), are incompatible with phloem flow. Rather, the presence of only minute amounts of 99mTc in typical sinks for phloem solutes and 99mTc transport out of labeled leaves when shaded but not when illuminated strongly suggest that the radionuclide is transported in the xylem. The study increases confidence in the identification of 99mTcO4- as a xylem mobile compound whose distribution in plants can be visualized using nuclear medicine scintigraphic imaging techniques.

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