ISSN:
1615-6110
Keywords:
Angiosperms
;
Brassicaceae
;
Capsella
;
Ribulose-1,5-bisphosphate carboxylase/oxygenase
;
isoelectric focusing
;
evolution
;
polyploidization
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco, EC 4.1.1.39) and its subunits (large subunits = LSU, small subunits = SSU) were isolated from threeCapsella spp. by gel electrophoresis and polypeptide composition was analyzed by isoelectric focusing (IEF) in the presence of 8M urea. The described techniques are recommended for large scale systematic studies. Multiple IEF banding patterns of the SSU are probably the outcome of a heterogenous multigene family. The two diploid speciesC. rubella andC. grandiflora show an identical IEF pattern and could be differentiated from the putative allotetraploidC. bursa-pastoris only by the SSU banding pattern. Uniqueness of some SSU bands in the tetraploid and in the two diploid species, respectively, may indicate an ancient alloploid origin of tetraploidC. bursa-pastoris followed by events leading to divergences in the genomes of the allotetraploid and its presumed diploid progenitors after the hybridization event (SSU gene elimination, acquisition of new SSU genes).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00937807
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