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Loss of the AKT2/3 potassium channel affects sugar loading into the phloem of Arabidopsis

Overview of attention for article published in Planta, December 2002
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About this Attention Score

  • Good Attention Score compared to outputs of the same age (73rd percentile)
  • High Attention Score compared to outputs of the same age and source (81st percentile)

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81 Mendeley
Loss of the AKT2/3 potassium channel affects sugar loading into the phloem of Arabidopsis
Published in
Planta, December 2002
DOI 10.1007/s00425-002-0895-1
Pubmed ID

Rosalia Deeken, Dietmar Geiger, Jörg Fromm, Olga Koroleva, Peter Ache, Rosemarie Langenfeld-Heyser, Norbert Sauer, Sean May, Rainer Hedrich


Members of the AKT2/3 family have been identified as photosynthate-induced phloem K(+) channels. Here we describe the isolation and characterisation of an AKT2/3 loss-of-function mutant (akt2/3-1) from Arabidopsis thaliana (L.) Heynh. Microautoradiography following (14)CO(2) incubation in the light revealed that a major fraction of (14)CO(2)-derived photosynthates leaking out of sieve tubes appears not to be effectively reloaded (retrieval) into the phloem of the mutant. Using the aphid stylectomy technique we showed that the phloem sap of the mutant, lacking the phloem channels of the AKT2/3 type, contained only half the sucrose content of the wild type. Furthermore, the akt2/3-1 mutant exhibited a reduced K(+) dependence of the phloem potential. Xenopus oocytes expressing the phloem sucrose/proton symporter depolarise upon sucrose application. When, however, the phloem channel was co-expressed - mimicking the situation in the sieve tube/companion cell complex - depolarisation was prevented. From our studies we thus conclude that AKT2/3 regulates the sucrose/H(+) symporters via the phloem potential.

Mendeley readers

The data shown below were compiled from readership statistics for 81 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Portugal 2 2%
Spain 1 1%
United Kingdom 1 1%
Unknown 77 95%

Demographic breakdown

Readers by professional status Count As %
Researcher 27 33%
Student > Ph. D. Student 26 32%
Student > Master 6 7%
Professor 5 6%
Student > Bachelor 4 5%
Other 13 16%
Readers by discipline Count As %
Agricultural and Biological Sciences 56 69%
Biochemistry, Genetics and Molecular Biology 10 12%
Unspecified 7 9%
Earth and Planetary Sciences 4 5%
Environmental Science 3 4%
Other 1 1%

Attention Score in Context

This research output has an Altmetric Attention Score of 4. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 08 March 2012.
All research outputs
of 12,221,136 outputs
Outputs from Planta
of 1,785 outputs
Outputs of similar age
of 11,568,596 outputs
Outputs of similar age from Planta
of 1,716 outputs
Altmetric has tracked 12,221,136 research outputs across all sources so far. This one has received more attention than most of these and is in the 74th percentile.
So far Altmetric has tracked 1,785 research outputs from this source. They receive a mean Attention Score of 3.0. This one has done well, scoring higher than 82% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 11,568,596 tracked outputs that were published within six weeks on either side of this one in any source. This one has gotten more attention than average, scoring higher than 73% of its contemporaries.
We're also able to compare this research output to 1,716 others from the same source and published within six weeks on either side of this one. This one has done well, scoring higher than 81% of its contemporaries.