AOBPreview published online on March 28, 2003
Annals of Botany, doi:10.1093/aob/mcg088
© 2003 by Annals of Botany Company
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Submitted on September 20, 2002
Affiliation of the authors:
1 Departamento de Botânica, Instituto de Biologia, Universidade Estadual de Campinas, SP, Brazil;
2 School of Biology, The University, St Andrews, Scotland, UK
* To whom correspondence should be addressed. E-mail: nesbitte{at}unicamp.br.
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.
Revised on December 9, 2002
Accepted on February 20, 2003
Histological Study of Post-pollination Events in Spathodea campanulata Beauv. (Bignoniaceae), a Species with Late-acting Self-incompatibility
NELSON S. BITTENCOURT JR1*,
Key words: Bignoniaceae, Spathodea, breeding system, late-acting self-incompatibility, pollen tube, embryology.
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