Fig. 3From: Exogenous auxin regulates multi-metabolic network and embryo development, controlling seed secondary dormancy and germination in Nicotiana tabacum L.Radicle weight (a), length (b) and surface area (c) of tobacco seed imbibed in supplementation IAA solution or ddH2O 24 h or untreated and then germinated on filter paper beds 156 h. Different letters indicate significant differences according to Duncan test (means ± SD, p < 0.05). Subscript 10, 100, 1000 indicate the concentration gradientsBack to article page