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Chromosome numbers in Sonneratia and Duabanga (Lythraceae s.l.) and their systematic significance.
Author(s) -
Graham Shirley A.,
Oginuma Kazuo,
Raven Peter H.,
Tobe Hiroshi
Publication year - 1993
Publication title -
taxon
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 81
eISSN - 1996-8175
pISSN - 0040-0262
DOI - 10.2307/1223300
Subject(s) - lythraceae , biology , taxon , botany , chromosome number , autapomorphy , chromosome , karyotype , phylogenetic tree , genetics , gene
Summary Graham, S. A., Oginuma, K., Raven, P. H. & Tobe, H.: Chromosome numbers in Sonneratia and Duabanga (Lythraceae s.l.) and their systematic significance. ‐ Taxon 42: 35‐41. 1993. ‐ISSN 0040‐0262. Published chromosome numbers in Sonneratia and Duabanga are inconsistent and indicate the basic numbers of the two genera are x = 9 or 11 and x = 12, respectively. Chromosome number counts made in this study for three species of Sonneratia indicate 2 n = 24, and for two species of Duabanga , 2 n = 48. The base is established as x = 12 in both genera. Although the genera have accumulated numerous autapomorphies that lead them to be regarded in separate subfamilies Sonneratioideae and Duabangoideae of the Lythraceae s.l., they share karyologically similar chromosomes and a unique basic number for the family, which is x = 8 in the remaining subfamilies Punicoideae and Lythroideae. Sonneratia and Duabanga are regarded as among the most primitive genera of the Lythraceae s.l. A number of other myrtalean higher taxa also have x = 12. This base number is most likely the ancestral number for the order.