裸粒水稻花序和小穗的发育进程研究

Developmental course of the inflorescence and spikelet in naked seed rice

裸粒水稻是水稻和小麦远缘杂交的产物,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,但目前仍对其花序和小穗的发育进程缺乏详细的认识。通过扫描电镜观察,发现从枝穗分化期至顶端小花内外稃分化期,裸粒水稻的发育仍与水稻没有明显区别,但在其后花器官的发育上较为紊乱,花器官确定性丧失,从而产生额外的花器官和次级小穗。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。

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 ]emma 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.