New Zealand Journal of Botany abstract

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B97078
Received 30 November 1997; accepted 16 January 1998

Chromosome numbers of Phragmites australis (Arundineae: Gramineae) in New Zealand

H. E. CONNOR

Department of Geography
University of Canterbury
Private Bag 4800
Christchurch, New Zealand

M. I. DAWSON

Landcare Research
P. O. Box 69
Lincoln, New Zealand

R. D. KEATING
L. S. GILL

Oceans Environmental Engineering (NZ) Ltd
Clarkville, New Zealand

Abstract  Somatic chromosome numbers for New Zealand provenances of Phragmites australis are reported. A wide range of cytological variation was encountered--one plant was tetraploid (2n = 4x₂ = 48), two were octoploid (2n = 8x₂ = 96), and two were mixoploid (2n = 48, 53, 54; and 2n = 96, c. 264). One Australian provenance was octoploid. Possible regions of origin for the New Zealand populations are suggested, and multiple introductions postulated, although it is conceivable that some octoploids could be indigenous in a cytodeme shared with Australia.

Keywords  chromosome numbers; polyploidy; aneuploidy; mixoploidy; Arundineae; Gramineae; Phragmites; P. australis; New Zealand; Australia

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