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Plant and Cell Physiology Advance Access published online on September 2, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci192
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received March 31, 2005
Accepted August 15, 2005

Short Communication

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

Maiko Koseki 1, Kazunori Goto 1, Chikara Masuta 1, and Akira Kanazawa 1*

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

* To whom correspondence should be addressed.
Akira Kanazawa, E-mail: kanazawa{at}res.agr.hokudai.ac.jp


  Abstract

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 the CHS RNA is the primary cause of the formation of white sectors in the ‘Red Star’ flowers.

Keywords: chalcone synthase; Cucumber mosaic virus; Petunia hybrida; post-transcriptional gene silencing; RNA silencing; short interfering RNA.
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