莱阳茌梨花蜜腺的发育解剖学研究

DEVELOPMENTAL AND ANATOMICAL STUDIES OF THE FLORAL NECTARIES IN PYRUS BRETSCHNEIDERI REHD.CV.TSE-LI

莱阳茌梨花蜜腺位于花柱与花丝之间的花托内壁上，属于花托蜜腺。由于有些部位的分泌表皮与泌蜜组织向外突起从而在花托上形成圆形突起。蜜腺由分泌表皮和泌蜜组织组成，不含维管束。分泌表皮上分布有大量气孔器，其孔下室发达，蜜腺由花托表皮及其内的细胞发育而来，在发育过程中，蜜腺组织中淀粉粒呈现出规律性变化，属于淀粉型蜜腺，原蜜汁由蜜腺周围的维管束提供，经过泌蜜组织加工成蜜汁，再通过蜜腺表面圆形突起基部的气孔泌出。

Pyrus bretschneideri Rehd.cv.Tse-Li has a floral nectary on receptacle located between styles and filaments. The nectary, which lacks special vascular bundle,is composed of secrectory epidermis and nectariferous tissue. Many stomata are present in the epidermis and they have well-developed space under them. The nectary initiates from the superficial layer cells of the receptacle. During the development of nectary, starch grains of cells change regularly. The nectary is starch-storing nectary.Pre-nectar is provided by the vascular bundles. These vascular bundles are around the nectary. Nectar formed in nectariferous tissue is secreted by the stomata which are located at the base of round break-out of nectary.