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Plant and Cell Physiology Advance Access originally published online on September 2, 2005
Plant and Cell Physiology 2005 46(11):1879-1883; doi:10.1093/pcp/pci192
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Short Communication

The Star-type Color Pattern in Petunia hybrida ‘Red Star’ Flowers is Induced by Sequence-Specific Degradation of Chalcone Synthase RNA

Maiko Koseki, Kazunori Goto, Chikara Masuta and Akira Kanazawa*

Graduate School of Agriculture, Hokkaido University, Kita-ku, Sapporo, 060-8589 Japan

* Corresponding author: Email, kanazawa{at}res.agr.hokudai.ac.jp; Fax, +81-11-706-4933.

Petunia hybrida ‘Red Star’ is a variety whose flowers exhibit a star-type red and white bicolor pattern. We analyzed the mRNA levels of six genes involved in anthocyanin biosynthesis. Only the level of chalcone synthase (CHS) mRNA was depressed in the unpigmented flower sectors. Both transcriptional activity and the accumulation of short interfering RNA of CHS in the unpigmented sectors were detected. Viral infection blocked the generation of CHS-silenced sectors. These results indicate that sequence-specific degradation of CHS RNA is the primary cause of the formation of white sectors in ‘Red Star’ flowers.

(Received March 31, 2005; Accepted August 15, 2005)
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