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The transmitting tract in Trimezia fosteriana (Iridaceae). III. Pollen tube growth in the stigma, style and ovary
Author(s) -
Bystedt PerArne,
Vennigerholz Felizitas
Publication year - 1991
Publication title -
nordic journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.333
H-Index - 33
eISSN - 1756-1051
pISSN - 0107-055X
DOI - 10.1111/j.1756-1051.1991.tb01248.x
Subject(s) - pollen tube , biology , cuticle (hair) , pollen , stigma (botany) , botany , ovary , anatomy , pollination , endocrinology
Trimezia fosteriana is a self‐incompatible plant with an open style. The stigma was found to be receptive for approx. three hours. Pollen tube growth in the entire transmitting tract was followed with LM, SEM and TEM. The cuticle that covers the mature papillae is continuous but in the rest of the transmitting tissue it is thin and ruptured. The pollen tubes grow in a mucilage mixed with cuticle remnants. In the style, however, larger parts of a cuticle film remains which gives the impression that pollen tube growth occurs under a cuticle. The secretion contains proteins and carbohydrates including pectic substances. The pollen tube growth rates were estimated to 2 mm/hour in the stigma, 1–2 mm/hour in the style and 0.5 mm/hour in the ovary.