Journal
AUSTRALIAN JOURNAL OF BOTANY
Volume 64, Issue 2, Pages 160-170Publisher
CSIRO PUBLISHING
DOI: 10.1071/BT15049
Keywords
geographic variation; multivariate analysis; seedling morphology
Categories
Funding
- 12th National Five-Year Plan for Forestry Project [2012BAD01B0603]
- Forestry Science and Technology Innovation Project of Guangdong [2014KJCX017]
- National Natural Science Foundation of China (NSFC) [31470634]
- Ministry of Finance of China through a Specific Program for the National Non-profit Scientific Institutions [RITFYWZX 201203]
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Seeds collected from 28 natural provenances and introduced populations of Casuarina equisetifolia subsp. equisetifolia L. from Oceania, Asia and Africa were used to study geographic variation in growth and morphology of nursery-grown seedlings. Ten characteristics related to growth and branching habit were measured for each seedling and the resultant data subjected to univariate and multivariate analyses. In general, seedlings from Oceania grew more slowly, were more densely branched with fine and upright branching, and had fewer teeth per whorl than those from other areas. Cluster analysis effectively separated Oceania from Asian natural provenances, and revealed the probable original sources of introductions to different parts of Asia and Africa. Further investigation into the pattern of variation through molecular characterisation of genetic material from all major regions of distribution is warranted in order to better understand the genetic relationships and enhance more efficient utilisation of this important casuarina species.
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