BSA Online Image Collection, Cellular Communication Channels

Welcome to the Botanical Society of America's online image collection. We hope you enjoy a browse through our members' contributions. Please note: each image acts as a link to a page containing more information, and a larger version of the picture. RETURN TO THE IMAGE MAP

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Young parenchyma tissue cut parallel with the epidermis Parenchyma cells in phloem of Cucurbita maxima leaf Plasmodesmatal structure in longitudinal Constictions at both ends of plasmodesma presumably have valve-like function Plasmodesmata originating during cell division
         
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Mitosis in longitudinal divisions of elongated cells Late telophase (nuclei not shown) Involvement of ER in formation of plasmodesmata Cell plate has become the cell wall with fully formed plasmodesmata Young sieve element and companion cell
         
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Two stages in sieve plate development Young wall with plasmodesmata sieve plate elements and companion cells Further development of a pore site in longitudinal view Continuous callose and plasmalemma in former plasmodesmal canal Left, plugs of callose, penetrated by plasmodesmata, fill the pores. Right, pores open, lined with thin layer of callose
         
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P-protein plug in pore Cross sections through pores filled with P-protein P-protein digestion with pepsin (left); control (right) Plasmodesma connecting a sieve element (below) and branched plasmodesma located on the companion cell Primary xylem of Phaseolus vulgaris stem, with ring-like and helical secondary walls
         
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Removal of vessel end wall Unperforated vessel wall parts Partially hydrolyzed primary wall Vessel member from Pelargonium leaf with perforations and pits

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