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    Development of Pollen Grain Walls and Accumulation of Sporopollenin

    By means of electron microscopy, we studied the development of pollen grain walls in Calendula officinalis L., Dimorphotheca aurantiaca DC., and Cichorium intybus L. (Asteraceae). As a reference, we studied the p...

    N. R. Meier-Melikyan, N. I. Gabaraeva in Russian Journal of Plant Physiology (2003)