Do you have data files for rice intergenic sequences, 5UTR and 3UTR respectively?
We have files containing UTR (both 5′ and 3′) in our ftp site (ftp://ftp.plantbiology.msu.edu/pub/data/Eukaryotic_Projects/o_sativa/annotation_dbs/) when the gene model aligned well with rice EST and/or full-length cDNA sequences (see README ftp://ftp.plantbiology.msu.edu/pub/data/Eukaryotic_Projects/o_sativa/annotation_dbs/README).