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United States Department of Agriculture

Agricultural Research Service

Title: Crazy Sepal: a New Floral Sepallata-Like Mutant in the Wild Potato Solanum Microdontum Bitter

Author
item Bamberg, John

Submitted to: American Journal of Potato Research
Publication Type: Abstract Only
Publication Acceptance Date: June 1, 2006
Publication Date: February 1, 2007
Citation: Bamberg, J.B. 2007. Crazy sepal: a new floral sepallata-like mutant in the wild potato solanum microdontum bitter [abstract]. American Journal of Potato Research. 84:76.

Technical Abstract: The major economic impact of features of reproduction in Solanum and its close relatives make basic study of the genetics and physiology of flowering important in this genus. A qualitative floral-development mutant in the wild potato Solanum microdontum Bitter (PI 473166) was discovered that is ostensibly normal in all respects except that repeated (indeterminate) whorls of strap-like sepals replace petals, pistil and anthers, thus called "crazy sepal" = cs1. This mutant appears to be similar to sepallata mutants in Arabidopsis. Mutant clones vary in the development of sepals (ranging from small and light-colored to larger, dark and leaf-like) and the determinance of whorls. Crossing studies support single locus recessive inheritance. This mutant may be a useful tool for the study of floral genetics in Solanum, potential pleiotropic physiological effects on tuberization and other features of the potato crop. It would be a good marker for the study of rare genetic events since individuals reverting to flowering would be very easily detected among thousands of their mutant sibs. Transgene escape is of concern in potato, especially in Latin America where compatible wild species often grow in proximity to the crop. The absolute sterility of this mutant could be applied to this and similar practical breeding problems.

Last Modified: 4/18/2014
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