AtSUC2 has a role for sucrose retrieval along the phloem pathway: Evidence from carbon-11 tracer studies

The location of the phloem within a plant, and its vulnerability to disruption, make it a difficult tissue to study and therefore non-invasive studies of phloem functionality are important. Here we compare, phloem transport, measured non-invasively, in wild type Arabidopsis thaliana, and transposon-...

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Bibliographic Details
Published in:Plant science (Limerick) 2012-06, Vol.188, p.97-101
Main Authors: Gould, N, Thorpe, M.R, Pritchard, J, Christeller, J.T, Williams, L.E, Roeb, G, Schurr, U, Minchin, P.E.H
Format: Article
Language:English
Subjects:
11C tracer
Agronomy. Soil science and plant productions
Arabidopsis - genetics
Arabidopsis - metabolism
Arabidopsis thaliana
Biological and medical sciences
Biological Transport
Carbon - metabolism
Carbon Radioisotopes
Fundamental and applied biological sciences. Psychology
Gene Expression Regulation, Plant - genetics
Gene Knockout Techniques
Genetics and breeding of economic plants
Membrane Transport Proteins - genetics
Membrane Transport Proteins - metabolism
Mutagenesis
Mutagenesis, Insertional
mutants
phloem
Phloem - metabolism
Phloem leakage
Phloem transit times
Plant breeding: fundamental aspects and methodology
Plant Proteins - genetics
Plant Proteins - metabolism
sucrose
Sucrose - metabolism
Sucrose transporter
transporters
Transposon mutagenesis
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Summary:The location of the phloem within a plant, and its vulnerability to disruption, make it a difficult tissue to study and therefore non-invasive studies of phloem functionality are important. Here we compare, phloem transport, measured non-invasively, in wild type Arabidopsis thaliana, and transposon-insertion mutants for AtSUC1 or AtSUC2, giving in vivo information on the importance of these sucrose transporters for phloem transport. The suc2 mutant showed an increase in both phloem leakage and transport time, consistent with reduced sucrose uptake into both transport and collection phloem. The results are consistent with the AtSUC2 transporter being important for retrieval of leaked sucrose in the transport phloem of Arabidopsis. There was no difference in phloem transport properties between the wild type and the suc1 mutants, implying that the AtSUC1 transporter does not play a significant role within the transport phloem of Arabidopsis under the conditions of our study.
ISSN:0168-9452
1873-2259
DOI:10.1016/j.plantsci.2011.12.018