Variation in morphological traits among and within populations of Austrodanthonia caespitosa (Gaudich.) H.P. Linder and four related species
C. Waters A E , G. Melville A , D. Coates B , J. Virgona C , A. Young D and R. Hacker A
+ Author Affiliations
- Author Affiliations
A Industry and Investment NSW, Division of Primary Industries, PMB 19, Trangie, NSW 2823, Australia.
B Department of Environment and Conservation, Locked Bag 104, Bentley Delivery Centre, WA 6983, Australia.
C Charles Sturt University, Locked Bag 588, Wagga Wagga, NSW 2678, Australia.
D CSIRO Plant Industry, GPO Box 1600, Canberra, ACT 2601, Australia.
E Corresponding author. Email: cathy.waters@industry.nsw.gov.au
Australian Journal of Botany 59(4) 324-335 https://doi.org/10.1071/BT10204
Submitted: 13 August 2010 Accepted: 17 April 2011 Published: 9 June 2011
Abstract
The native perennial grasses Austrodanthonia spp. are widespread and of great agricultural economic importance to large areas of southern Australia. However, little is known of the adaptive genetic variation that exists within wild populations. Intra-specific genetic variation has significant implications for the restoration and management of native plant communities because different seed sources may exhibit differences in adaptation. Using two common garden studies, we measured variation in morphological traits (flowering and growth) and water-use efficiency (carbon-isotope discrimination Δ) of Austrodanthonia caespitosa (Gaudich.) H.P. Linder and related species (A. bipartita, A. eriantha, A. fulva and A. setacea) and related this variation to environmental characteristics. Most variation for all species occurred among populations suggesting ecotypic variation. The significant relationship between flowering and growth characteristics of A. caespitosa and both large-scale climatic variables such as spring rainfall and sunshine hours and small-scale site characteristics such as shading provides evidence for trait-dependent adaptation at different scales. While components of fecundity such as flowering time and number of inflorescences represent important fitness traits, for other traits such as intrinsic water use there were no significant differences between populations. We discuss the implication of these results to both growth characteristics and sourcing seed.
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