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Annals of Botany 88: 19-26, 2001
© 2001 Annals of Botany Company

Spatial and Developmental Variation in Seed Dormancy Characteristics in the Fire-responsive Species Anigozanthos manglesii(Haemodoraceae) from Western Australia

A. Tieu+, K. W. Dixon, K. A. Meney, K. Sivasithamparam and R. L. Barrett

Science Directorate, Botanic Garden and Parks Authority, Kings Park and Botanic Garden, West Perth, 6005, Western Australia Soil Science and Plant Nutrition, The University of Western Australia, Nedlands, 6907, Western Australia Plant Science, The University of Western Australia, Nedlands, 6907, Western Australia

Received: 4 September 2000 ; Returned for revision: 9 January 2001 . Accepted: 13 March 2001

Anigozanthos manglesii(Haemodoraceae) is a colourful, herbaceous perennial exhibiting intra- and inter-populational variation in germination in response to smoke and heat. This study investigated the extent and nature of this variation in A. manglesii populations collected along a 550 km latitudinal cline from kwongan scrub (30°S) to more mesic jarrah forest habitats (34°S) in southwestern Australia. Variation in seed germination along a maturing inflorescence was also investigated. Germination of this species is known to be prolific following fire, and two germination treatments, aerosol smoke and heat, were used as germination cues. There was a trend of increasing responsiveness of A. manglesii to smoke with increasing latitude along a clinal range, but there were no differences in germination of seeds along the cline in response to control or heat treatments. There was no significant difference in intra-population seed germination in response to any treatment. Lastly, a significant and increasing response to smoke for seeds from the apex to base of the inflorescence was detected. This latter trend may be attributed to higher resource allocation and an accelerated after-ripening of basipetal compared to acropetal seeds. Possible reasons for the clinal variation are discussed.Copyright 2001 Annals of Botany Company

Anigozanthos manglesii, populations, geographical cline, inflorescence level, germination, smoke, heat, fire, seed development


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S. R. TURNER, D. J. MERRITT, E. C. RIDLEY, L. E. COMMANDER, J. M. BASKIN, C. C. BASKIN, and K. W. DIXON
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