STUDIES ON POLLEN‐TUBE CHEMOTROPISM

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Abstract
Rosen, Walter G. (Marquette U., Milwaukee, Wis.) Studies on pollen‐tube chemotropism. Amer. Jour. Bot. 48(10): 889–895. Illus. 1961.—Pollen tubes of several species and hybrids of Lilium are attracted to certain pistil parts of Lilium in vitro. Positive chemotropism is observed with a variety of pistil‐pollen combinations and is independent of the compatibility of these combinations in vivo. The chemotropic factor can be extracted by steeping the pistil parts in water. Chemotropic activity is retained following freeze‐drying of pistil parts or extracts. The active material from L. longiflorum is heat‐labile, dialyzable and not precipitated by acetone. Under certain conditions it causes distention of the pollen tube wall. Chemotropic activity of pistil parts is not simulated by a variety of known compounds or by extracts from various sources other than pistils. A possible mechanism of action of the chemotropic factor is discussed.
Funding Information
  • National Science Foundation (G–5709)

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