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Different effects of inorganic and triethyl lead on growth and ultrastructure of lily pollen tubes.

Unterschiedliche Giftwirkung von anorganischem und Triethylblei auf Wachstum und Ultrastruktur von Lilien-Pollenschläuchen
: Röderer, G.; Reiss, H.D.

Protoplasma 144 (1988), S.101-109 : Abb.,Lit.
ISSN: 0033-183X
ISSN: 1615-6102
Fraunhofer IUCT ( IME) ()
Blei; Lilium; Mikrotubuli; Pollenschlauch; Triethylblei; Ultrastruktur; Wachstum

Pollen tubes of Lilium longiflorum growing in vitro were treated for 1 h with inorganic lead (Pb) and with triethyl lead (TriEL) and studied by light- and electron microscopy. Pb was considerably more toxic in relation to inhibition of pollen tube growth (EC50 = 6 myM Pb) than was TriEL (EC50 = 60 myM TriEL). On the other hand, at almost the entire concentration range tested (25-500 myM) TriEL caused aberrant tubes and tube swellings. Pb did not cause tube swellings, even at highly growth-impairing concentrations. Pb (60 myM) predominantly affected the ultrastructure of the growing cell walls without impairing the distribution of the cell organelles, in the tube tips. In contrast, 50 and 100 myM TriEL did not visibly, influence cell wall ultrastructure but it severely damaged dictyosomes; 100 myM TriEL also disturbed the original order of cell organelles in the tube tips. Cortical microtubules were selectively and completely destructed by TriEL at concentrations (50 myM) where no effec t on polar organization of the tube tips occured but they remained unimpaired by 60 myM Pb, indicating selective and effective interaction of TriEL with these cell organelles. (IUCT)