Abstract:
:Arbuscular mycorrhizal fungi enhance CO₂ assimilation 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 sucrose transporter genes were analysed. Mycorrhizal plants showed increased opening of stomata and assimilated significant more CO₂. A higher proportion of the absorbed light was used for photochemical processes, 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 sucrose transporter encoding genes of tomato SlSUT1, 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.
journal_name
J Plant Physioljournal_title
Journal of plant physiologyauthors
Boldt K,Pörs Y,Haupt B,Bitterlich M,Kühn C,Grimm B,Franken Pdoi
10.1016/j.jplph.2011.01.026subject
Has Abstractpub_date
2011-07-15 00:00:00pages
1256-63issue
11eissn
0176-1617issn
1618-1328pii
S0176-1617(11)00123-4journal_volume
168pub_type
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