Über die pleomorphie von MLO in Catharanthus roseus (Vinca rosea)

About the pleomorphism of MLO in Catharanthus roseus (Vinca rosea) MLO of the flower greening (virescence)-type of Primula in the phloem of Catharanthus roseus (Vinca rosea) were fixed in two different ways. After prefixation with OsO4 they showed a diminished pleomorphic morphology, most MLO were spherical. With the fixation of KARNOVSKY (1965) and subsequent treatments with OsO4 and uranyl acetate, however, an extremely high pleomorphism was observed. Such pleomorphic MLO in single thin sections are probably the expression of a threedimensional network-like connection. The concentration of MLO in the sieve elements seems to influence the pleomorphism only insignificantly.

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