Analysis of TAW1 gene, that controls transition of meristem identity in rice.

Abstract

In this study, we analyzed tawawa1 (taw1) mutant of rice, that has an abnormal panicle structure.
The panicle of taw1 has more spikelets than wild type, because it has more rachis branches. The number of axillary meristems produced on a rachis is comparable between taw1 and wild type. However, axillary meristems in taw1 panicle tend to be rachises, while those in wild type tend to acquire the spikelet identity. Abnormal spikelt development was also observed in taw1 suggesting that TAW1 gene is necessary for axillary meristem to obtain the identity as a spikelet.
TAW1 gene was identified by positional cloning. TAW1 is expressed in the reproductive apex. Transcription level of TAW1 is remarkably reduced in taw1 compared to wild type.
We will discuss the function of TAW1 and its possible interaction with plant hormones and other genes.