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Root regeneration responses of in vitro cultured shoots originating from somatic embryos of embryogenic line 27 to exogenous 1.2 µmol/l ɑ-naphthaleneacetic acid (NAA) and/or 2 µmol/l paclobutrazol (PBZ) added to the root regeneration medium in Pinus massoniana. Small letters indicate the differences among exogenous plant growth regulator treatments according to Duncan’s tests at P ≤ 0.05
