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Anther wall formation, microsporogenesis and male gametogenesis of four closely related species in Astereae (Asteraceae): description, comparison and systematic implications
Author(s) -
Ao Chengqi,
Wang Lihua,
Liang Li,
Wang Xiaofeng
Publication year - 2009
Publication title -
nordic journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.333
H-Index - 33
eISSN - 1756-1051
pISSN - 0107-055X
DOI - 10.1111/j.1756-1051.2009.00331.x
Subject(s) - biology , stamen , pollen , botany , asteraceae , advanced spaceborne thermal emission and reflection radiometer , sensu , tapetum , cytokinesis , gametogenesis , microspore , microbiology and biotechnology , genus , cell division , embryo , remote sensing , genetics , cell , cryopreservation , digital elevation model , geology
The embryological features of microsporangiate wall formation, microsporogenesis and male gametogenesis in Aster subulatus , Kalimeris indica , Heteropappus arenarius and Erigeron annuus are described for the first time. Although external morphology might suggest that these four species differ from each another, we found no distinctly different embryological features. They all share similar characteristics, such as a tetrasporangiate anther, coexisting amoeboid and glandular tapeta, simultaneous cytokinesis (except for 12% occurrence of successive cytokinesis in E. annuus ), 3‐celled mature pollen grains and endothecium of anther wall that does not develop fibrous thickenings. Based on the embryological data, we suggest that Kalimeris and Heteropappus may be included within Aster , and that Erigeron is closely related to Aster sensu lato.