Richardson, A.Hayes, J.Simpson, R.2008-05-302008-05-302001http://hdl.handle.net/2440/45082Pub. No.: WO/2001/022806 International Application No.: PCT/AU2000/001183 Publication Date: 05.04.2001 International Filing Date: 22.09.2000 Chapter 2 Demand Filed: 19.04.2001The present invention provides a method of modifying plant productivity comprising expressing in a plant cell, tissue or organ one or more genes capable of facilitating a plant's ability to utilise soil phosphorus, and, in particular, a phytase gene, wherein said phytase gene expresses a phytase polypeptide in secretable form. More particularly, the present invention provides a method of increasing plant productivity comprising expressing in the root of a plant an isolated nucleic acid molecule encoding a phytase polypeptide for a time and under conditions sufficient for said phytase to be secreted from the root. In a preferred embodiment of the invention the chemistry of the soil around the root is modified by the application of an organic acid. The invention also provides novel phytase-encoding genes; genetic constructs which are useful for performing the inventive method; and transgenic plants produced therewith having improved productivity compared to their otherwise isogenic counterparts.enPatent00200775002008053014044644178Hayes, J. [0000-0001-8716-5024]