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Expression of SPP genes in roots of della1/della2 and wild-type plants. (A–D) Transcript levels of SSP genes in roots either mock-inoculated (−AMF) or colonized by G. versiforme (+AMF) at 21 d.p.i., assayed by quantitative RT-PCR. Data are averages ± SEM (n ≥ 5, where N denotes the number of independent root samples). *P ≤ 0.05; **P ≤ 0.01; ***P ≤ 0.001.
