Record ID No. |
2980 |
Author(s) |
Boldt K, Pörs Y, Haupt B, Bitterlich M, Kühn C, Grimm B, Franken P. , 2011 |
Affiliation |
Leibniz-Institute of Vegetable and Ornamental Crops, Theodor-Echtermeyer-Weg 1, D-14979 Grossbeeren, Germany, Email: franken@igzev.de |
Title |
Photochemical processes, carbon assimilation and RNA accumulation of sucrose transporter genes in tomato arbuscular mycorrhiza |
Source. Vol.(no):Page |
Journal of Plant Physiology 168(11): 1256–1263p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Biochemistry |
Sub-subjects |
Carbohydrate metabolism |
Host |
Solanum lycopersicum |
Organism |
Glomus mosseae |
Country |
Germany, Europe |
Abstracts |
Arbuscular mycorrhizal fungi enhance CO2assimilation of their hosts which ensure the demand for carbohydrates of these obligate biotrophic microorganisms. Photosynthetic parameters were measured in tomato colonised or not by the arbuscular mycorrhizal fungus Glomus mosseae. In addition, carbohydrate contents and mRNA accumulation of three sucrosetransportergenes were analysed. Mycorrhizal plants showed increased opening of stomata and assimilated significant more CO2. A higher proportion of the absorbed light was used for photochemicalprocesses, while non-photochemical quenching and the content of photoprotective pigments were lower. Analysis of sugar contents showed no significant differences in leaves but enhanced levels of sucrose and fructose in roots, while glucose amounts stayed constant. The three sucrosetransporter encoding genes of tomatoSlSUT1, SlSUT2 and SlSUT4 were up-regulated providing transport capacities to transfer sucrose into the roots. It is proposed that a significant proportion of sugars is used by the mycorrhizal fungus, because only amounts of fructose were increased, while levels of glucose, which is mainly transferred towards the fungus, were nearly constant.
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