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POLLEN TUBE GROWTH AND INBREEDING DEPRESSION IN AMSINCKIA GRANDIFLORA (BORAGINACEAE)
Author(s) -
Weller Stephen G.,
Ornduff Robert
Publication year - 1991
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1991.tb14482.x
Subject(s) - biology , inbreeding depression , pollen tube , boraginaceae , pollen , pollination , callose , botany , hand pollination , selfing , pollinator , inbreeding , population , demography , cell wall , sociology
To discriminate between the roles of differential pollen tube growth and inbreeding depression in causing reduced seed production following self‐pollination of distylous Amsinckia grandiflora (Boraginaceae), callose plug and pollen tube production were compared following cross‐ and self‐pollinations of A. grandiflora . Pin (long‐styled morph) × thrum (short‐styled morph) crosses yielded more pollen tubes than pin × pin crosses or pin self‐pollinations; no difference could be detected for the pin × pin or pin self‐pollination categories. Using thrums as the female parent, no significant differences were detected in any pollination category. These results indicate that reduced seed production following self‐fertilization of A. grandiflora is likely to be the result of inbreeding depression rather than inhibition of self pollen tubes.