Developmental course of the inflorescenceand spikelet in naked seed rice

Naked seed rice was derived from the hybrid progeny between rice and wheat. the previous studies have shown that the functional mutations in OsMADS1 plays a main role in floral morphological changes, but the detailed development course of the inflorescence and spikelet was still known little. Based on scanning electron microscope observation, it is shown that the development in naked seed rice is not obvious difference with rice from the differentiation stage of secondary branches in inflorescence to the differentiation stage of lemma and palea in upper floret of spikelet. In the subsequent stages, floral organs development is seriously disorder and floral organ identities lose, resulting in extra floral organs and secondary spikelets. Therefore, these observations will help us to better understand molecular mechanism of phenotypic mutation in naked seed rice.