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AOBPreview originally published online on March 28, 2003
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Annals of Botany 91: 827-834, 2003
© 2003 Annals of Botany Company

Histological Study of Post-pollination Events in Spathodea campanulata Beauv. (Bignoniaceae), a Species with Late-acting Self-incompatibility

NELSON S. BITTENCOURT JR1, PETER E. GIBBS2 and JOÃO SEMIR1

1 Departamento de Botânica, Instituto de Biologia, Universidade Estadual de Campinas, SP, Brazil and 2 School of Biology, The University, St Andrews, Scotland, UK

* For correspondence. E-mail nesbitte{at}unicamp.br
{dagger} Visiting CNPq research fellow, Instituto de Biologia, Universidade Federal de Uberlândia, MG, Brazil.

Received: 20 September 2002; Returned for revision: 9 December 2002; Accepted: 20 February 2003    Published electronically: 27 March 2003

The reproductive biology of Spathodea campanulata was investigated by means of hand-pollination experiments, observations of pollen tube growth using fluorescence microscopy, and serial sections of ovules in selfed and crossed pistils. Only cross-pollinated flowers developed fruits, and all selfed flowers abscised within 3–4 d. However, self pollen tubes grew successfully to the ovary, penetrating and fertilizing the majority of ovules by 48 h, indicating that S. campanulata is a species with late-acting self-incompatibility. The incidences of ovule penetration, fertilization and endosperm initiation were all significantly slower in selfed vs. crossed pistils, although no other signs of malfunctioning were detected. The possible role of such slow self pollen tube effectiveness as a recognition event is discussed within the context of the slow but not entirely suppressed self pollen tube growth reported for some species with conventional homomorphic self-incompatibility.

Key words: Bignoniaceae, Spathodea, breeding system, late-acting self-incompatibility, pollen tube, embryology.


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