裸粒水稻花序和小穗的发育进程研究

裸粒水稻是水稻和小麦远缘杂交的产物袁此前的研究已表明OsMADS1基因功能的改变是其特有花部性状的主要原因袁但目前仍对其花序和小穗的发育进程缺乏详细的认识遥通过扫描电镜观察袁发现从枝穗分化期至顶端小花内外稃分化期袁裸粒水稻的发育仍与水稻没有明显区别袁但在其后花器官的发育上较为紊乱袁花器官确定性丧失袁从而产生额外的花器官和次级小穗遥这些观察有助于更好地理解裸粒水稻形态变异的分子机理遥

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.