Abstract: Retraction Statement I recently submitted two papers to the Journal of Integrative Plant Biology and they have been published in 2006, Vol. 48 (1), 35–43 (K. Xiao, J.-H Zhang, M. Harrison and Z.-Y Wang. Ectopic Expression of a Phytase Gene from Medicago truncatula Barrel Medic Enhances Phosphorus Absorption in Plants) and 2006, Vol. 48 (2), 204–211 (K. Xiao, M. Harrison and Z.-Y Wang. Cloning and haracterization of a Novel Purple Acid Phosphatase Gene (MtPAP1) from Medicago truncatula Barrel Medic). These two papers in the Journal of Integrative Plant Biology contain data that were in two papers that had been submitted earlier to the journals Planta (K. Xiao, M. Harrison and Z.-Y Wang. 2005. Transgenic expression of a novel M. truncatula phytase gene results in improved acquisition of organic phosphorus by Arabidopsis, Vol. 222, 27–36) and Plant Science (K. Xiao, H. Katagi, M. Harrison and Z.-Y. Wang. 2006. Improved phosphorus acquisition and biomass production in Arabidopsis by transgenic expression of a purple acid phosphatase gene from M. truncatula by 170:191–202). I am very sorry that the papers with some duplicate data, which was firstly used in the papers published in Planta and Plant Science, were re-published in the Journal of Integrative Plant Biology. When I submitted the manuscripts to the Journal of Integrative Plant Biology, the co-authors M. Harrison and Z.-Y. Wang were not involved and therefore were not aware of the submissions until after these papers were published. Therefore, it is my fault to cause these adverse results. Here I am regretful to have made some damage to their reputations. As the corresponding author for the Journal of Integrative Plant Biology papers, here I retract the papers published in the Journal of Integrative Plant Biology (2006, Vol. 48 (1), 35–43 and 2006, Vol. 48 (2), 204–211). I apologize for any adverse consequences and inconveniences that may have resulted from the publications of these papers. Sincerely Kai Xiao College of Agronomy Hebei Agricultural University