Figure 6

The expression profiles of the identified MdMAPKKKs in roots and leaves of four species under drought conditions by qRT-PCR analysis. (a) Expression profiles of the identified MdMAPKKKs in the leaves of Malus hupehesis (Pamp.) Rehd. var. pinyiensis, (b) Expression profiles of the identified MdMAPKKKs in the roots of Malus hupehesis (Pamp.) Rehd. var. pinyiensis, (c) Expression profiles of the identified MdMAPKKKs in the leaves of Malus hupehesis (Pamp.) Rehd. var. taishanensis, (d) Expression profiles of the identified MdMAPKKKs in the roots of Malus hupehesis (Pamp.) Rehd. var. taishanensis, (e) Expression profiles of the identified MdMAPKKKs in the leaves of Malus baccata (L.) Borkn, (f) Expression profiles of the identified MdMAPKKKs in the roots of Malus baccata (L.) Borkn, (g) Expression profiles of the identified MdMAPKKKs in the leaves of Malus sieversii (Ledeb.) Roem, (h) Expression profiles of the identified MdMAPKKKs in the roots of Malus sieversii (Ledeb.) Roem. Data are mean values of three biology repeats, and error bars indicate SD. Statistical significance between the PEG 0h and PEG 3h were determined by Student's t-test: *P < 0.05; **P < 0.01; ***P < 0.001.