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AOBPreview published online on October 15, 2004
Annals of Botany, doi:10.1093/aob/mch216
© 2004 by Annals of Botany Company
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Received May 14, 2004
Revised June 16, 2004
Accepted September 2, 2004

Article

Breeding System in a Population of Trigonella balansae (Leguminosae)

RAMAKRISHNAN M. NAIR 1*, IAN S. DUNDAS 2, MEREDITH WALLWORK 3, DAWN C. VERLIN 2, LYN WATERHOUSE 3, and KATE DOWLING 4

1 South Australian Research & Development Institute (SARDI), GPO Box 397, Adelaide, SA 5001, Australia
2 School of Agriculture and Wine, University of Adelaide, Waite Campus, PMB 1, Glen Osmond, SA 5064, Australia
3 Adelaide Microscopy, University of Adelaide, Adelaide, SA 5005, Australia
4 BiometricsSA, SARDI, GPO Box 397, Adelaide, SA 5001, Australia

* To whom correspondence should be addressed. E-mail: madhavannair.ram{at}saugov.sa.gov.au.


  Abstract

• Background and Aims Although some taxonomic studies in the genus Trigonella have been conducted, there has been no concerted effort to study the breeding system. This paper examines the floral structure and pollination system in a population of T. balansae, an annual pasture legume.

• Methods Floral morphology, hand and vector pollination, stigma receptivity, pollen tube growth, using scanning electron and fluorescence microscopy, were conducted.

• Key Results Measurements of floral structure from before to after anthesis indicates an inability for T. balansae to self-pollinate and a requirement for an external vector to effectively transfer pollen from the anthers onto the stigmas of this species. Seed set can be obtained by hand or honeybee manipulation of T. balansae flowers.

• Conclusions Trigonella balansae is a self-compatible species, but which requires vectors such as honeybees to bring about pollination.

Keywords: Trigonella balansae, pollination, pollen tube growth, stigma receptivity, inbreeding depression.
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