Abstract
Structure and devlopment of seeds and two types of fruits of Dimorphotheca sinuata have been investigated. The ovule is anatropous, unitegmic and tenuinucellate. The integument at the organised female gametophyte stage is distinguishable into three zones, (a) outer zone of compactly arranged cells, (b) the second of larger cells with less cytoplasmic contents constituting the periendothelial zone, and (c) the third zone of endothelial layer. In mature seeds of ray-and disc-florets though the number of cell-layers in the seed-coat varies, the structure of epidermal cells in all aspects is similar. The endothelium at this stage is represented by a thick noncellular pellicle. Almost all the endosperm is consumed except the outermost layer. The mature embryo is larger in ray fruits as compared to disc. The hypocotyl-root-axis of the embryo in both types of fruits is shorter than the cotyledons. Ovaries of both ray-and disc-florets develop into fruits. The fruits of former are wingless while those of latter are winged. Distribution and amount of various types of cells are also variable in two types of fruits. The winged fruits are better suited for wind dispersal as no pappus is present on the fruits.
Sign-in/Register to access full text options 
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.
