Abstract
Summary 1. The lipophilic excretion of some species of Alnus contains besides terpenoids several free flavonoid aglycones. In A. glutinosa , two flavonole methyl ethers were isolated and characterized; they seem to be hitherto unknown. In A. japonica , apigenine-7,4′-di-0-methylether, quercetine-7,3′, 4′ -tri-0-methylether, rhamnazine, acacetine, and kaempferide were identified chromatographically. The excretions in vegative and generative buds are qualitatively identical. It is possible, to discern the different species analysed in this study by their flavonoid pattern. 2. The development and the structure of the glands are studied by electron microscopy. During the excretory phase, the gland cells show an extended tubular, agranular endoplasmic reticulum: this corresponds to the excretion of the flavonoid aglycones and/or other lipophilic, terpenoid substances. Further they contain a well developped apparently active Golgi apparatus: this corresponds to the occurrence of slime in the excretion found by D ormann (1924). The structure of the cuticle in the different stages and cell types is described. There is no endodermislike sheath in the walls of the stalk cells when the gland is active. Some fibrillar and tubular inclusion bodies are figured. The glands, their excretion and their structure are compared with other glands and their products.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
