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Annals of Botany 78: 189-196, 1996
© 1996 Annals of Botany Company

Ultrastructure and Function of Floral Nectaries of Chamelaucium uncinatum (Myrtaceae)

SUSAN P. O'BRIEN, BRIAN R. LOVEYS and W. J. R. GRANT

CSIRO, Division of Horticulture, 306 Carmody Road, St Lucia, Qld. 4067 CSIRO, Division of Horticulture, GPO Box 350, Adelaide, South Australia, 5001, Australia

October 18, 1995 ; February 5, 1996

Nectar is secreted for up to 11d after anthesis inChamelaucium uncinatum . The volume and sucrose concentration secreted varies between flowers, plants and days. The period of nectar secretion coincides with the period of pollen presentation and stigmatic receptivity suggesting nectar is part of an efficient reproductive strategy inC. uncinatum . The nectary ofC. uncinatum consists of the entire upper surface of the ovary and hypanthium. The epidermis of the nectary is covered by a thickened cuticle which is only broken at the sites of the numerous modified stomata which are scattered across its surface. It is suggested that nectar is secreted onto the surface of the ovary via these modified stomata. The presence of extensive and well developed endoplasmic reticulum, mitochondria and Golgi bodies in the nectar secreting cells indicates that a granulocrine mechanism of secretion is occurring inC. uncinatum .

Chamelaucium uncinatum ; Geraldton Waxflower; floral nectaries; nectar production; modified stomata


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