期刊
JOURNAL OF PLANT PHYSIOLOGY
卷 168, 期 11, 页码 1256-1263出版社
ELSEVIER GMBH
DOI: 10.1016/j.jplph.2011.01.026
关键词
Arbuscular mycorrhiza; CO2 gas exchange; Chlorophyll fluorescence; Glomus mosseae; Photosynthesis; Solanum lycopersicon; Source-sink relation; Sucrose transport
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 SISUT1, SISUT2 and SISUT4 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. (C) 2011 Elsevier GmbH. All rights reserved.
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