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Expression levels of sucrose synthase genes (CsSUS1–4) (A–D), cell wall invertase genes (CsCWIN1–5) (F–J), and the enzyme activity analysis of CsSUS (E) and CWIN (K) in infected and non-infected cucumber roots by M. incognita. Error bars represent ± SE (n = 5). Student’s t-test is analyzed between infected and non-infected roots, *P < 0.05; **P < 0.01; ***P < 0.001.
