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- Title
Evolution in Spartina (Gramineae): II. Chromosomes, basic relationships and the problem of S. × townsendii agg.
- Authors
MARCHANT, C. J.
- Abstract
An intensive study of the cytology and sexual behaviour of the classical Spartina x townsendii agg. and their putative parents in southern England reveals a more complex chromosomal situation than had previously been reported, including aneusomaty in Southampton S. alterniflora populations and in S. x townsendii agg. Chromosome numbers are 2 n= 60 and 2 n= 62 for S. maritima and S. alterniflora respectively and 2 n= 62 and 2 n= 120, 122 and 124 (chromosome races) for S. x townsendii F1 and Amphidiploid derivatives respectively. These numbers, though their summation is less precise than hitherto reported, still support the hybridity and amphidiploid origin of S. x townsendii agg. and the process is further confirmed by meiotic pairing data and the discovery of wild backcross hybrids (2 n= c.90and 2 n=76) near the site of origin at Southampton. The 2 n= 62 chromosome number of S. alterniflora, out of line with the x= 10 base number of the genus, is explained as a polysomic condition (2 n= 60+ 2) and needs further investigation with a study of North American populations. It is suggested that chromosome races found in S. x townsendii Amphidiploid will provide adaptive variation in this highly significant and successful amphidiploid.
- Publication
Botanical Journal of the Linnean Society, 1968, Vol 60, Issue 383, p381
- ISSN
0024-4074
- Publication type
Article
- DOI
10.1111/j.1095-8339.1968.tb00096.x