Floral morphology and pollination system in the native Australian perennial pasture legume Cullen australasicum (syn. Psoralea australasica)
Yan-Jing Wang A , Ramakrishnan M. Nair B C E , Chun-Sheng Mu A and Ian S. Dundas D
+ Author Affiliations
- Author Affiliations
A Institute of Grassland Science, Northeast Normal University, Key Laboratory of Vegetation Ecology, Ministry of Education, Changchun, Jilin Province 130024, China.
B South Australian Research and Development Institute, GPO Box 397, Adelaide, SA 5001, Australia.
C Future Farm Industries Cooperative Research Centre, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
D School of Agriculture and Wine, University of Adelaide, Waite Campus, PMB 1, Glen Osmond, SA 5064, Australia.
E Corresponding author. Email: ramakrishnanmnair@gmail.com
Crop and Pasture Science 61(12) 1001-1008 https://doi.org/10.1071/CP10193
Submitted: 2 June 2010 Accepted: 1 November 2010 Published: 8 December 2010
Abstract
Cullen australasicum (syn. Psoralea australasica) is a native perennial legume with potential in the low-rainfall wheatbelt of southern Australia. The objective of this study was to investigate the reproductive biology of C. australasicum utilising five accessions. Glasshouse and field pollination experiments were conducted in Adelaide, South Australia. Floral morphology, stigma receptivity and pollen : ovule ratios were determined. Pollen tube growth and stigma morphology were examined using fluorescence and scanning electron microscopes. Glasshouse pollination studies indicated that four of the accessions showed the need for an external tripping agent to bring about pollination and that hand-tripping was the most efficient method. A scanning electron microscopy study revealed there are two types of stigmas in this species. Stigma receptivity was significantly lower at the early bud stage before anther dehiscence. The results show that C. australasicum is a self-compatible species comprising accessions with a wide range of outcrossing potential.
Additional keywords: pollen tube growth, stigmatic surface cuticle.
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