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Title: Decaploidy in Fragaria Iturupensis Staudt (Rosaceae)

Author
item Hummer, Kim
item NATHEWET, PREEDA
item YANAGI, TOMOHIRO

Submitted to: American Journal of Botany
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/20/2008
Publication Date: 11/20/2008
Citation: Hummer, K.E., Nathewet, P., Yanagi, T. 2008. Decaploidy in Fragaria Iturupensis Staudt (Rosaceae). American Journal of Botany. 96(3)713-716.

Interpretive Summary: The strawberry has a basic chromosome number of 7. The ploidy levels of natural wild strawberry species, include diploid, tetraploid, pentaploid, hexaploid, octoploid, and nonaploid plants. Artificial triploid , tetraploid, pentaploid, octoploid, decaploid, 16-ploid, and 32-ploid plants have been constructed in the laboratory and grown in cultivation. Hitherto, the Iturup Island Strawberry, a species with limited distribution on Atsunupuri Volcano, Iturup Island, of the Kurile Islands, Sakhalin Territory, in the Russian Federation, has been described as octoploid. Surprisingly, our research, using chromosome analysis and flow cytometry revealed that the Iturup strawberry includes naturally occurring decaploid plants. This is the first report of a naturally occurring decaploid (ten times the basic chromosome number) strawberry species.

Technical Abstract: The strawberry genus, Fragaria (Rosaceae), has a basic chromosome number of x = 7. The ploidy levels of natural wild strawberry species, include diploid (2n = 2x = 14), tetraploid (2n = 4x =28), pentaploid (2n = 5x = 35), hexaploid (2n = 6x = 42), octoploid (2n = 8x = 56), and nonaploid (2n = 9x = 63) plants. Artificial triploid (2n = 3x = 21), tetraploid, pentaploid, octoploid, decaploid (2n = 10x =70), 16-ploid, and 32-ploid plants have been constructed in the laboratory and grown in cultivation. Hitherto, F. iturupensis Staudt, a species with limited distribution on Atsunupuri Volcano, Iturup Island, of the Kurile Islands, Sakhalin Territory, in the Russian Federation, has been described as octoploid. Surprisingly, our research, using chromosome analysis and flow cytometry revealed that F. iturupensis includes naturally occurring decaploid genotypes with 2n = 10x = 70 chromosomes. This is the first report of a naturally occurring decaploid strawberry species.