GENOMES OF THE AUSTRALIAN WILD SPECIES OF COTTON. II. THE DESIGNATION OF A NEW G GENOME FORGOSSYPIUM BICKII

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Abstract
Gossypium bickii Prokh. is distinct from the C genome species, although it was tentatively placed in this genome. A comparison of the karyotypes of G. bickii and G. sturtianum Willis separates G. bickii sharply from G. sturtianum, the standard species for the C genome. Karyotypic differences are evident in centromere position of the chromosomes, chromosome size, and the lack of satellites or secondary constrictions in G. bickii. A clear separation of G. bickii from G. sturtianum and other Gossypium species is also demonstrated in previous studies of phenetic analysis, flower flavonoids, DNA content, and electrophoresis of seed proteins, esterases, leucine aminopeptidases, and catalases. G. bickii is placed in a new G genome and is assigned to the 2G1subgenome.