Microsporogenesis, microgametogenesis, and pollen morphology of Ambrosia artemisiifolia L. in China
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Ambrosia artemisiifolia L. from Ambrosia of the Heliantheae of the Asteraceae family is a recognized harmful weed worldwide and one of the major invasive foreign plants in China. In this study, we investigated its reproductive features, focusing on its microsporogenesis, microgametogenesis, and pollen morphology. The results show that (1) Ambrosia artemisiifolia L. is a dicotyledonous plant and has spherical, tricolpate pollen grains with spiny outer wall; (2) its anther wall comprises four layers, namely epidermis, endothecium, middle layers, and amoeboid tapetum; (3) cytokinesis of microspore mother cells is successive; (4) most of tetrads are tetrahedral; and (5) mature pollen grains are three-celled. In conclusion, although Ambrosia artemisiifolia L. is a dicotyledonous plant with tricolpate pollen, its microsporogenesis is successive, which is different from typical dicots.
KeywordsAmbrosia artemisiifolia L. Microsporogenesis Microgametogenesis Pollen morphology Reproductive biology Successive cytokinesis Invasive plant
This work is supported by the Beijing Natural Science Foundation of China (grant nos. 8102012 and 8022007) and the Science and Technology Projects of Beijing Municipal Education Commission of China (grant no. KM200910028013).
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