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- Title
Pistil Receptivity and Pollen Tube Growth in Relation to the Breeding System of Eucalyptus woodwardii (Symphyomyrtus: Myrtaceae).
- Authors
SEDGLEY, M.; SMITH, R. M.
- Abstract
Pistil structure, stigma receptivity and pollen tube growth were investigated in relation to seed set of . Self-pollination resulted in reduced capsule retention and seed development as compared with cross-pollination. The pistil consisted of an ovary with five locules, a long style with a canal extending for two-thirds of its length, and a papillate stigma. There was no change in style length with time after anthesis, but both stigma secretion and ability to support pollen germination and tube growth increased to reach a peak at 7 d. Pollen germinated on the stigma surface and in the stylar canal, but most tube growth occurred intercellularly in the transmitting tissue surrounding the canal. At the base of the style the pollen tubes split into five groups following the transmitting tissue strands to the ovary. Each group grew through a septum dividing two locules and entered the placenta. The tubes then emerged from the placenta to penetrate the ovules at between 10 and 20 d after pollination. Fewer ovules were penetrated following self- than cross-pollination.
- Publication
Annals of Botany, 1989, Vol 64, Issue 1, p21
- ISSN
0305-7364
- Publication type
Article