CELL-TYPE-SPECIFIC EXPRESSION OF 3 RICE GENES GOS2, GOS5 AND GOS9

The cell-type-specific expression of three rice genes, GOS2, GOS5 and GOS9, was studied by mRNA in situ hybridization. Previous northern blo t analysis revealed that these genes were constitutive, green tissue-s pecific and root-specific, respectively. In this study, GOS2 transcrip ts were observed in all leaf cell types. In roots, a temporal and spat ial expression pattern was noticed. Higher mRNA levels were observed i n lateral roots, especially in parenchymal cells of the vascular cylin der. Expression of GOS5 was mainly found in chloroplast-containing cel ls. For GOS9, significant levels of signal were observed in root and l eaf sections.