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Longitudinal Section Through the Phloem of Cheiranthus cheiri (Brassicaceae)



Sieve tube without (S) and companion cells with nuclei (B). They are bordered by a parenchyma cell (P). The sieve tube contains sieve tube plastids (SP of the S-Type), mitochondria (M), endoplasmatic reticulum (ER) and P-proteins (P-P). The sieve plate (P1) is perforated by pores. (H.-D. BEHNKE, 1981)



© Peter v. Sengbusch - b-online@botanik.uni-hamburg.de