Biomass and root-shoot ratio of wild type and transgenic maize plants.

<p>Maize seeds were sown in flowerpots containing a naturally low-Pi soil (10 mg Pi kg⁻¹ soil) with either no additional KH₂PO₄ (low phosphate, LP) or mixed with 600 mg KH₂PO₄ (sufficient phosphate, SP) per kilogram soil, one plant per flowerpot. On the 20th, 40th, 60th and 80th day of growth, the dry weights of wild type and transgenic plants were determined after they were dried to constant weight in an oven at 80°C. (A) shoot biomass. (B) root biomass. (C) plant biomass. (D) root dry weight-shoot dry weight ratio. Values are means ± SD (<i>n</i> = 5). DW, dry weight; WT, wild type; L1, L2 and L3, transgenic lines; SP, sufficient phosphate and LP, low phosphate.