Constitutive overexpression of the sucrose transporter SoSUT1 in potato plants increases arbuscular mycorrhiza fungal root colonization under high, but not under low, soil phosphorus availability.

摘要: The sucrose transporter SUT1 functions in phloem loading of photoassimilates solanaceous plant species. In the present study, wildtype and transgenic potato plants with either constitutive overexpression or antisense inhibition were grown under high low phosphorus (P) fertilization levels presence absence arbuscular mycorrhizal (AM) fungus Glomus intraradices. At a soil P level, extent AM fungal root colonization was not different among genotypes. all plants, symbiosis contributed significantly to uptake these conditions. response genotypes showed decrease colonization, indicating that expression level does constitute major mechanism control over development availability. However, higher compared other when availability high. Whether an increased symbiotic C supply, alterations phytohormonal balance, decreased synthesis antimicrobial compounds cause for this effect requires further investigation. impaired loading, status sink tissues did apparently negatively affect supply symbiosis. It is possible that, at least during vegetative early generative growth, source rather than exert amounts supplied fungi.