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Interference Through Improper Pollen Transfer in Mixed Stands of Impatiens capensis and I. pallida (Balsaminaceae)

1990; Wiley; Volume: 77; Issue: 7 Linguagem: Inglês

10.2307/2444509

1537-2197

John L. Randall, Khidir W. Hilu,

Fern and Epiphyte Biology

American Journal of BotanyVolume 77, Issue 7 p. 939-944 Article INTERFERENCE THROUGH IMPROPER POLLEN TRANSFER IN MIXED STANDS OF IMPATIENS CAPENSIS AND I. PALLIDA (BALSAMINACEAE) John L. Randall, John L. Randall Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, 24061Search for more papers by this authorKhidir W. Hilu, Khidir W. Hilu Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, 24061Search for more papers by this author John L. Randall, John L. Randall Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, 24061Search for more papers by this authorKhidir W. Hilu, Khidir W. Hilu Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, 24061Search for more papers by this author First published: 01 July 1990 https://doi.org/10.1002/j.1537-2197.1990.tb15188.xCitations: 24 Author for correspondence, current address: Department of Biology, Salem College, Winston–Salem, NC 27108. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract Mechanisms of interference through improper pollen transfer are described for sympatric populations of the simultaneously flowering annuals Impatiens capensis and I. pallida. Stigmas of both Impatiens species are receptive to conspecific pollen from the time of androecium disarticulation until after perianth drop. Pollen of I. pallida adheres to, and germinates on, the stigmas of I. capensis. The pollen tubes reach the ovules but do not fertilize them. In contrast, pollen of I. capensis adheres poorly to I. pallida stigmas and fails to germinate. Pollen mixtures of the two Impatiens species cause a much greater reduction in fruit set in I. capensis than in I. pallida. Despite the interference of I. pallida pollen, I. capensis persists in mixed populations with I. pallida by: 1) possessing stigmas receptive to pollen throughout the female phase; 2) having the ability to produce a full seed complement via one pollination event; and 3) possessing cleistogamous flowers to ensure sexual reproduction. Citing Literature Volume77, Issue7July 1990Pages 939-944 RelatedInformation