ISSN:
1615-6110
Keywords:
Brassicaceae
;
Lepidium
;
sectt.Dileptium
;
Monoploca
;
Rubisco
;
IEF
;
systematics
;
immigration
;
long-distance dispersal
;
Flora of Australia
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Variation in subunit polypeptide composition of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) from native AustralianLepidium taxa was analyzed by isoelectric focusing (IEF). Species of grexMonoplocoidea on the one hand, and species of gregesPseudoruderalia andPapillosa on the other, were well separated by Rubisco IEF patterns. The protein data suggest grexMonoplocoidea to be placed in sect.Monoploca whereas gregesPseudoruderalia andPapillosa should be integrated into sect.Dileptium. We suggest that the Rubisco type of American and/or AsianLepidium species was contained in those plants migrating to Australia and evolving into the recent native Australian species. Fossil pollen records and vegetation history indicate that the origin ofLepidium in Australia was restricted to the late Tertiary of Quaternary. Data presented in this study fit best with an immigration by long-distance dispersal of seeds by birds from Asia and/or from South America.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00937738
