AOBPreview originally published online on October 15, 2004
Annals of Botany 2004 94(6):883-888; doi:10.1093/aob/mch216
Annals of Botany 94/6, © Annals of Botany Company 2004; all rights reserved
Breeding System in a Population of Trigonella balansae (Leguminosae)
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 and 4 BiometricsSA, SARDI, GPO Box 397, Adelaide, SA 5001, Australia
* For correspondence. E-mail: madhavannair.ram{at}saugov.sa.gov.au
Received: 14 May 2004 Returned for revision: 16 June 2004 Accepted: 2 September 2004 Published electronically: 15 October 2004
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.
Key words: Trigonella balansae, pollination, pollen tube growth, stigma receptivity, inbreeding depression