The AtTudor2, a protein with SN-Tudor domains, is involved in control of seed germination in Arabidopsis.

The 4SN-Tudor domain protein is an almost ubiquitous eukaryotic protein with four Staphylococcal nuclease domains at the N terminus and a Tudor domain towards the C terminus. It has been found that Tudor-SN protein has multiple roles in governing gene expression during cell growth and development in animals. In plant, although Tudor-SN orthologs have been found in rice, pea and Arabidopsis, and are associated with cytoskeleton, their roles in growth and development are poorly understood. In this study, we investigated the function of Arabidopsis Tudor-SN protein, AtTudor. Our results indicated that the expression of AtTudor2 in seeds was evidently higher than in other tissues. Furthermore, we found that the expression of a key enzyme for GA biosynthesis, AtGA20ox3, was downregulated obviously in AtTudor2 T-DNA insertion mutant and AtTudor1/AtTudor2 RNAi transgenic lines. Together, our results suggest that AtTudor2 is involved in GA biosynthesis and seed germination of Arabidopsis.