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POLLEN AND TAPETUM DEVELOPMENT IN DESMODIUM GLUTINOSUM AND D. ILLINOENSE (PAPILIONOIDEAE; LEGUMINOSAE)
Author(s) -
Buss Paul A.,
Galen Donald F.,
Lersten Nels R.
Publication year - 1969
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1969.tb09776.x
Subject(s) - tapetum , callose , microspore , biology , pollen , botany , meiosis , sporogenesis , cytokinesis , double fertilization , stamen , mitosis , microbiology and biotechnology , pollen tube , cell wall , spore , cell division , pollination , cell , biochemistry , genetics , gene
Each of the four microsporangia has three or four wall layers, a uninucleate tapetum of various cell shapes with nuclei that remain in prophase, and 12‐24 pollen mother cells (PMCs). A sterile transverse septum sometimes bisects the microsporangium. PMCs secrete callose but not uniformly, and contact among them continues through meiosis. Simultaneous cytokinesis by furrowing isolates each microspore in callose, which later disperses. The separated microspores become vacuolate, undergo mitosis to become pollen, and later become filled with food reserves. Endothecial wall thickening and tapetal dissolution occur after pollen engorgement. Calcium oxalate crystals form in tapetal cells during the sporogenous stage, reach maximum size during early meiosis, and remain prominent until tapetal dissolution.