“新梨七号”花蜜腺的发育解剖学研究

An anatomical study on the floral nectary of Xin-Li No.7 pear

应用石蜡切片法 ,通过显微镜解剖观察对表现雄性不育性的“新梨七号”的花蜜腺位置、形态结构及发育过程进行了系统的研究。观察结果 :其花蜜腺发育完全正常 ,位于花托表面 ,由分泌表皮和蜜腺组织构成 ,属于花托蜜腺。蜜腺是由花托内壁表皮和其内侧相邻的细胞经过分裂、生长、分化而来。 PAS染色反应表明 :蜜腺细胞中的淀粉粒 ,在发育过程中呈现出一定消长规律变化。蜜汁是通过蜜腺表面特异的气孔泌出。盛花期 ,在花托的表面积累大量无色透明的蜜汁。因此 。

With scanning electron microscope(SEM),the anatomy observation on the expressing male sterility of Xin Li No 7, the nectar situation, morphological structure and development process were systematically investigated. The experiment showed that Xin Li No 7 expressed male sterile and pollenless but its floral nectar developed thoroughly normally. The nectar locates on the receptacle surface consisting of secret epidermis and nectar tissue. This nectar belongs to receptacle nectar. The nectar initiated from receptacle inner epidermis cells and neighboring cells division, growth and differentiation. PAS chroma analysis: in the course of development, the starch grain in the nectar cell exhibit a regular change. The nectar secrets through special stomata on the nectar gland surface. In the full blooming stage, plenty of colourless transparent nectars accumulated on the receptacle surface.