Analysis of infection signaling system in the nodulation

Abstract

　Rhizobium form root nodule in the host legume. Phytohormone cytokinin is reported to be involved in the nodulation (Nod) factor signal transduction. In this study, expression of IPT concerning cytokinin synthesis was researched time-dependent change in the inoculation of Rhizobium. The analysis showed that a peak of expression appeared at one minute after infection. Then, a peak of expression was observed at 30 minutes after infection in cytokinin receptor gene LHK1. Therefore, it is likely to be a important role signaling system about cytokinin synthesis in nodule formation is discussed.